VENTILATION, HEATER & AIR CONDITIONER

HAC
A

B
SECTION
HEATER & AIR CONDITIONING CONTROL SYSTEM C
D

E
CONTENTS
AUTOMATIC AIR CONDITIONER DIAGNOSIS SYSTEM (BCM) ...........................28 F
PRECAUTION............................................... 5 COMMON ITEM......................................................... 28
PRECAUTIONS....................................................5 COMMON ITEM : CONSULT Function (BCM -
G 28
COMMON ITEM).....................................................
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- AIR CONDITIONER................................................... 29
SIONER"................................................................... 5 AIR CONDITIONER : CONSULT Function (BCM - H
Precaution for Work.................................................. 5 AIR CONDITIONER)............................................... 29
Working with HFC-134a (R-134a)............................. 5
Precaution for Service Equipment............................. 6 DIAGNOSIS SYSTEM (IPDM E/R).....................30
Diagnosis Description............................................. 30 HAC
PREPARATION............................................. 8 CONSULT Function (IPDM E/R)............................. 31

PREPARATION....................................................8 ECU DIAGNOSIS INFORMATION .............34 J

Special Service Tool................................................. 8
Commercial Service Tool.......................................... 8 A/C AUTO AMP..................................................34
Reference Value..................................................... 34
K
SYSTEM DESCRIPTION...............................9 DTC Inspection Priority Chart ..............................37
DTC Index............................................................... 38
COMPONENT PARTS......................................... 9
Component Part Location......................................... 9 ECM, IPDM E/R, BCM .......................................40 L
Component Description........................................... 10 List of ECU Reference............................................ 40

SYSTEM............................................................. 12 WIRING DIAGRAM...................................... 41

System Diagram...................................................... 12 M
System Description................................................. 12 AUTOMATIC AIR CONDITIONING SYSTEM....41
Air Flow Control....................................................... 13 Wiring Diagram....................................................... 41
Air Inlet Control....................................................... 14 N
Air Outlet Control..................................................... 15 BASIC INSPECTION ..................................51
Compressor Control................................................ 15 DIAGNOSIS AND REPAIR WORKFLOW.........51
Door Control............................................................ 15 Work Flow ...............................................................51 O
Temperature Control............................................... 20
Fail-safe.................................................................. 20 OPERATION INSPECTION................................53
Work Procedure ......................................................53
OPERATION....................................................... 21 P
Switch Name and Function..................................... 21 SYSTEM SETTING.............................................55
Temperature Setting Trimmer................................. 55
DIAGNOSIS SYSTEM (A/C AUTO AMP.).........24
Inlet Port Memory Function (FRE)........................... 55
Description.............................................................. 24
Inlet Port Memory Function (REC).......................... 56
CONSULT Function (HVAC)................................... 24
Target Evaporator Temp Upper Limit...................... 56

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2014
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DOOR MOTOR STARTING POSITION RE- POWER SUPPLY AND GROUND CIRCUIT......83
SET..................................................................... 57
Description.............................................................. 57 A/C AUTO AMP......................................................... 83
Work Procedure...................................................... 57 A/C AUTO AMP. : Diagnosis Procedure.................83

A/C SWITCH ASSEMBLY......................................... 83

DTC/CIRCUIT DIAGNOSIS.........................58
A/C SWITCH ASSEMBLY : Component Function
U1000 CAN COMM CIRCUIT.............................58 Check...................................................................... 83
Description.............................................................. 58 A/C SWITCH ASSEMBLY : Diagnosis Procedure...84
DTC Logic............................................................... 58 A/C SWITCH ASSEMBLY SIGNAL CIRCUIT. . .85
Diagnosis Procedure............................................... 58
Diagnosis Procedure............................................... 85
U1010 CONTROL UNIT (CAN).......................... 59 A/C ON SIGNAL................................................. 86
Description.............................................................. 59
Component Function Check.................................... 86
DTC Logic............................................................... 59
Diagnosis Procedure............................................... 86
Diagnosis Procedure............................................... 59
BLOWER FAN ON SIGNAL...............................88
B2578, B2579 IN-VEHICLE SENSOR...............60 Component Function Check.................................... 88
DTC Logic............................................................... 60
Diagnosis Procedure............................................... 88
Diagnosis Procedure............................................... 60
Component Inspection............................................ 61 BLOWER MOTOR..............................................90
Diagnosis Procedure............................................... 90
B257B, B257C AMBIENT SENSOR..................63 Component Inspection (Blower Motor)....................92
DTC Logic............................................................... 63
Component Inspection (Blower Motor Relay)..........93
Diagnosis Procedure............................................... 63
Component Inspection............................................ 64 MAGNET CLUTCH.............................................94
Component Function Check.................................... 94
B2581, B2582 INTAKE SENSOR...................... 66
Diagnosis Procedure............................................... 94
DTC Logic............................................................... 66
Diagnosis Procedure............................................... 66 ECV (ELECTRICAL CONTROL VALVE)...........95
Component Inspection............................................ 67 Diagnosis Procedure............................................... 95
Component Inspection............................................ 96
B2630, B2631 SUNLOAD SENSOR..................69
DTC Logic............................................................... 69 SYMPTOM DIAGNOSIS.............................. 97
Diagnosis Procedure............................................... 69
Component Inspection............................................ 70 HEATER AND AIR CONDITIONING SYSTEM
CONTROL SYMPTOMS.....................................97
B27A2, B27A3, B27A4, B27A5 AIR MIX Diagnosis Chart By Symptom................................. 97
DOOR MOTOR (DRIVER SIDE)........................ 72
DTC Logic............................................................... 72 INSUFFICIENT COOLING..................................99
Diagnosis Procedure............................................... 72 Description.............................................................. 99
Component Inspection............................................ 73 Diagnosis Procedure............................................... 99

B27AA, B27AB, B27AC, B27AD AIR MIX INSUFFICIENT HEATING................................ 101

DOOR MOTOR (PASSENGER SIDE)...............74 Description............................................................ 101
DTC Logic............................................................... 74 Diagnosis Procedure............................................. 101
Diagnosis Procedure............................................... 74
Component Inspection............................................ 75 COMPRESSOR DOES NOT OPERATE..........102
Description............................................................ 102
B27A6, B27A7, B27A8, B27A9 MODE DOOR Diagnosis Procedure............................................. 102
MOTOR............................................................... 77
DTC Logic............................................................... 77 REMOVAL AND INSTALLATION..............104
Diagnosis Procedure............................................... 77 A/C SWITCH ASSEMBLY................................ 104
Component Inspection............................................ 78
Removal and Installation....................................... 104
B27A0, B27A1 INTAKE DOOR MOTOR...........79 A/C AUTO AMP................................................ 105
DTC Logic............................................................... 79
Exploded View....................................................... 105
Diagnosis Procedure............................................... 79
Removal and Installation....................................... 105
Component Inspection (PBR).................................. 81
Component Inspection (Motor)................................ 82 AMBIENT SENSOR.......................................... 106
Removal and Installation....................................... 106

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IN-VEHICLE SENSOR...................................... 107 Temperature Control............................................. 126
Removal and Installation....................................... 107 A
OPERATION ................................................... 127
SUNLOAD SENSOR........................................ 108 Switch Name and Function................................... 127
Removal and Installation....................................... 108
DIAGNOSIS SYSTEM (BCM) (WITH INTELLI- B
INTAKE SENSOR............................................. 109 GENT KEY SYSTEM)....................................... 129
Removal and Installation....................................... 109
COMMON ITEM ......................................................129
REFRIGERANT PRESSURE SENSOR...........110 COMMON ITEM : CONSULT Function (BCM - C
Removal and Installation....................................... 110 COMMON ITEM)................................................... 129

DOOR MOTOR................................................. 111 AIR CONDITIONER ................................................130 D

Exploded View....................................................... 111 AIR CONDITIONER : CONSULT Function (BCM -
AIR CONDITIONER)............................................. 130
INTAKE DOOR MOTOR.......................................... 112
E
INTAKE DOOR MOTOR : Removal and Installa- DIAGNOSIS SYSTEM (BCM) (WITHOUT IN-
tion........................................................................ 112 TELLIGENT KEY SYSTEM)............................. 131
MODE DOOR MOTOR............................................ 112 COMMON ITEM ......................................................131 F
MODE DOOR MOTOR : Removal and Installation.112 COMMON ITEM : CONSULT Function (BCM -
COMMON ITEM)................................................... 131
AIR MIX DOOR MOTOR.......................................... 112
AIR MIX DOOR MOTOR : Removal and Installa- AIR CONDITIONER ................................................132 G
tion - Air Mix Door Motor RH................................. 112 AIR CONDITIONER : CONSULT Function (BCM -
AIR MIX DOOR MOTOR : Removal and Installa- AIR CONDITIONER)............................................. 132
tion - Air Mix Door Motor LH.................................. 112 H
DIAGNOSIS SYSTEM (IPDM E/R) (WITH IN-
POWER TRANSISTOR.................................... 113 TELLIGENT KEY SYSTEM)............................. 133
Removal and Installation....................................... 113 Diagnosis Description............................................ 133
MANUAL AIR CONDITIONER CONSULT Function (IPDM E/R)........................... 134 HAC

PRECAUTION............................................ 114 DIAGNOSIS SYSTEM (IPDM E/R) (WITHOUT

INTELLIGENT KEY SYSTEM) ........................ 137 J
PRECAUTIONS................................................ 114 Diagnosis Description............................................ 137
Precaution for Supplemental Restraint System CONSULT Function (IPDM E/R)........................... 138
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
K
SIONER"............................................................... 114 ECU DIAGNOSIS INFORMATION ........... 141
Precaution for Work............................................... 114
Working with HFC-134a (R-134a)......................... 114 A/C AUTO AMP................................................ 141
Precaution for Service Equipment......................... 115 Reference Value ...................................................141 L

PREPARATION.......................................... 117 ECM, IPDM E/R, BCM...................................... 144

List of ECU Reference........................................... 144
PREPARATION................................................ 117 M
Special Service Tool.............................................. 117 WIRING DIAGRAM.................................... 145
Commercial Service Tool...................................... 117
MANUAL AIR CONDITIONING SYSTEM ....... 145
Wiring Diagram...................................................... 145 N
SYSTEM DESCRIPTION............................118
COMPONENT PARTS...................................... 118 MANUAL HEATER SYSTEM........................... 152
Component Part Location...................................... 118 Wiring Diagram .....................................................152 O
Component Description......................................... 119 BASIC INSPECTION.................................. 156
SYSTEM............................................................ 121 P
DIAGNOSIS AND REPAIR WORKFLOW ...... 156
System Diagram.................................................... 121
Work Flow............................................................. 156
System Description............................................... 121
Air Flow Control..................................................... 122 OPERATION INSPECTION.............................. 157
Air Inlet Control...................................................... 122 Work Procedure.................................................... 157
Air Outlet Control................................................... 122
Compressor Control.............................................. 122 DTC/CIRCUIT DIAGNOSIS........................ 159
Door Control.......................................................... 123

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HAC-3
2014
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POWER SUPPLY AND GROUND CIRCUIT .. 159 SYMPTOM DIAGNOSIS............................. 181
A/C AUTO AMP....................................................... 159 HEATER AND AIR CONDITIONING SYSTEM
A/C AUTO AMP. : Diagnosis Procedure...............159 CONTROL SYMPTOMS................................... 181
A/C SWITCH ASSEMBLY....................................... 159 Symptom Table..................................................... 181
A/C SWITCH ASSEMBLY : Component Function INSUFFICIENT COOLING................................ 182
Check.................................................................... 159 Component Function Check.................................. 182
A/C SWITCH ASSEMBLY : Diagnosis Procedure 160
INSUFFICIENT HEATING................................ 184
MODE DOOR MOTOR..................................... 161 Component Function Check.................................. 184
Diagnosis Procedure............................................. 161
Component Inspection.......................................... 162 COMPRESSOR DOES NOT OPERATE..........186
Description............................................................ 186
AIR MIX DOOR MOTOR...................................163 Diagnosis Procedure............................................. 186
Diagnosis Procedure............................................. 163
Component Inspection.......................................... 164 REMOVAL AND INSTALLATION..............188
INTAKE DOOR MOTOR................................... 165 A/C ASSEMBLY SWITCH................................ 188
Diagnosis Procedure............................................. 165 Removal and Installation....................................... 188
Component Inspection (Motor).............................. 166
A/C AUTO AMP................................................ 189
A/C SWITCH ASSEMBLY SIGNAL CIRCUIT . Exploded View....................................................... 189
167 Removal and Installation....................................... 189
Diagnosis Procedure............................................. 167
INTAKE SENSOR............................................. 190
A/C ON SIGNAL............................................... 168 Removal and Installation....................................... 190
Component Function Check.................................. 168
Diagnosis Procedure............................................. 168 REFRIGERANT PRESSURE SENSOR...........191
Removal and Installation....................................... 191
INTAKE SENSOR............................................. 170
Diagnosis Procedure............................................. 170 DOOR MOTOR................................................. 192
Component Inspection.......................................... 171 Exploded View....................................................... 192
BLOWER FAN ON SIGNAL............................. 172 INTAKE DOOR MOTOR.......................................... 193
Component Function Check.................................. 172 INTAKE DOOR MOTOR : Removal and Installa-
Diagnosis Procedure............................................. 172 tion........................................................................ 193

BLOWER MOTOR............................................ 174 MODE DOOR MOTOR............................................. 193

Diagnosis Procedure............................................. 174 MODE DOOR MOTOR : Removal and Installation. 193
Component Inspection (Blower Motor)..................176
Component Inspection (Blower Motor Relay)........177 AIR MIX DOOR MOTOR.......................................... 193
AIR MIX DOOR MOTOR : Removal and Installa-
MAGNET CLUTCH........................................... 178 tion........................................................................ 193
Component Function Check.................................. 178
Diagnosis Procedure............................................. 178
BLOWER MOTOR RESISTOR.........................194
Removal and Installation....................................... 194
ECV (ELECTRICAL CONTROL VALVE).........179
Diagnosis Procedure............................................. 179
Component Inspection.......................................... 180
Revision:
October
2013
HAC-4

2014
Sentra
NAM
 PRECAUTIONS
< PRECAUTION > [AUTOMATIC AIR CONDITIONER]

PRECAUTION A
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT B
PRE-TENSIONER" INFOID:0000000010287622

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along C
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SR and SB section of
this Service Manual.
D
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed
by
an authorized NISSAN/INFINITI dealer. E
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to
personal injury caused by unintentional activation of the system. For removal of Spiral Cable and
Air Bag Module, see the SR section. F
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
G
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni- H
tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the HAC
battery and wait at least three minutes before performing any service.
Precaution for Work INFOID:0000000009757612
J
• When removing or disassembling each component, be careful not to damage or deform it. If a component
may be subject to interference, be sure to protect it with a shop cloth.
• When removing (disengaging) components with a screwdriver or similar tool, be sure to wrap the component K
with a shop cloth or vinyl tape to protect it.
• Protect the removed parts with a shop cloth and prevent them from being dropped.
• Replace a deformed or damaged clip.
L
• If a part is specified as a non-reusable part, always replace it with a new one.
• Be sure to tighten bolts and nuts securely to the specified torque.
• After installation is complete, be sure to check that each part works properly.
• Follow the steps below to clean components: M
- Water soluble dirt:
• Dip a soft cloth into lukewarm water, wring the water out of the cloth and wipe the dirty area.
• Then rub with a soft, dry cloth.
N
- Oily dirt:
• Dip a soft cloth into lukewarm water with mild detergent (concentration: within 2 to 3%) and wipe the dirty
area.
• Then dip a cloth into fresh water, wring the water out of the cloth and wipe the detergent off. O
• Then rub with a soft, dry cloth.
- Do not use organic solvent such as thinner, benzene, alcohol or gasoline.
- For genuine leather seats, use a genuine leather seat cleaner. P
Working with HFC-134a (R-134a) INFOID:0000000009757613

WARNING:
• CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed compressor failure is likely to occur. Refer to HA-25, "Inspection". To determine the
purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant Recovery/Recycling
Recharg- ing equipment and Refrigerant Identifier.

Revision: October 2013 HAC-5 2014 Sentra NAM

 PRECAUTIONS
< PRECAUTION > [AUTOMATIC AIR CONDITIONER]
• Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If
oil other than that specified is used, compressor failure is likely to occur.
• The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following
handling precautions must be observed:
- When removing refrigerant components from a vehicle, immediately cap (seal) the component to
minimize the entry of moisture from the atmosphere.
- When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just
before connecting the components. Connect all refrigerant loop components as quickly as possible
to minimize the entry of moisture into system.
- Only use the specified oil from a sealed container. Immediately reseal containers of oil. Without
proper sealing, oil will become moisture saturated and should not be used.
- Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) from the A/C system using certified service equipment meeting require-
ments of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-134a) recy-
cling equipment], If accidental system discharge occurs, ventilate work area before resuming
service. Additional health and safety information may be obtained from refrigerant and oil manufac-
turers.
- Do not allow A/C oil to come in contact with styrofoam parts. Damage may result.
CONTAMINATED REFRIGERANT
If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:
• Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into
the atmosphere.
• Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant
supply.
• Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.
• If you choose to perform the repair, recover the refrigerant using only dedicated equipment and contain-
ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility
does not have dedicated recovery equipment, you may contact a local refrigerant product retailer for
available ser- vice. This refrigerant must be disposed of in accordance with all federal and local regulations.
In addition, replacement of all refrigerant system components on the vehicle is recommended.
• If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact NISSAN
Cus- tomer Affairs for further assistance.
Precaution for Service Equipment INFOID:0000000009757614

MANIFOLD GAUGE SET

Be certain that the gauge face indicates R-134a or 134a. Make sure
the gauge set has 1/2-16 ACME threaded connections for service
hoses. Confirm the set has been used only with refrigerant HFC-
134a (R-134a) along with specified oil.

SHA533D

SERVICE HOSES

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HAC-6 2014 Sentra NAM
 PRECAUTIONS
< PRECAUTION > [AUTOMATIC AIR CONDITIONER]
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shut- A
off devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.
B

RHA272D

D
SERVICE COUPLERS
Do not attempt to connect HFC-134a (R-134a) service couplers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. However, if an E
improper connection is attempted, discharging and contamination
may occur.
F
Shut-off valve rotation A/C service valve
Clockwise Open
Counterclockwise Close G
RHA273D

HAC

Revision: October 2013 HAC-7 2014 Sentra NAM

 PREPARATION
< PREPARATION > [AUTOMATIC AIR CONDITIONER]

PREPARATION
PREPARATION
Special Service Tool INFOID:0000000009757615

The actual shape of the tools may differ from those illustrated here.
Tool number Description
(TechMate No.)
Tool name
— Removing trim components
(J-46534)
Trim Tool Set

AWJIA0483ZZ

Commercial Service Tool INFOID:0000000009757616

Tool name Description

Power tool Loosening nuts, screws and bolts

PIIB1407E

Revision: October 2013 HAC-8 2014 Sentra NAM

 COMPONENT PARTS
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]

SYSTEM DESCRIPTION A
COMPONENT PARTS
Component Part Location INFOID:0000000009757617
B

HAC

P
ALIIA0703ZZ

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 COMPONENT PARTS
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]

ALIIA0704ZZ

1. ECM 2. IPDM E/R 3. BCM (view with instrument panel re-

moved)
4. A/C auto amp. (view with A/C switch 5. A/C switch assembly 6. A/C Compressor
assembly removed)
7. Refrigerant pressure sensor (view 8. Ambient sensor 9. Sunload sensor
with front bumper fascia removed)
10. In-vehicle sensor 11. Blower motor relay 12. Blower motor (view with front A/C
assembly removed from vehicle)
13. Air mix door motor RH 14. Mode door motor 15. Intake door motor
16. Air mix door motor LH 17. Intake sensor 18. Variable blower control

Component Description INFOID:0000000009757618

Component Description
A/C auto amp. controls front automatic air conditioning system by inputting and calculating signals
A/C auto amp.
from each sensor and each switch.
Vaporized refrigerant is drawn into the A/C compressor from the evaporator, where it is
A/C Compressor compressed to a high pressure, high temperature vapor. The hot, compressed vapor is then
discharged to the con- denser.
The A/C switch assembly controls the operation of the A/C and heating system based on inputs from
the temperature control knob, the mode switches, the blower control dial, the ambient temperature
A/C switch assembly
sensor, the intake sensor, and inputs received from the ECM across the CAN. Diagnosis of the A/C
switch assembly can be performed using the CONSULT.
The air mix door controls the mix of hot or cold air that enters the ventilation system. It is controlled
Air mix door motor LH by the A/C auto amp. based on the position of the temperature dial. The air mix door motor LH re-
ceives position commands from the A/C auto amp.
The air mix door controls the mix of hot or cold air that enters the ventilation system. It is
Air mix door motor RH controlled by the A/C auto amp. based on the position of the temperature dial. The air mix door
motor RH re- ceives position commands from the A/C auto amp.
The ambient sensor measures the temperature of the air surrounding the vehicle. The sensor uses
Ambient sensor a thermistor which is sensitive to the change in temperature. The electrical resistance of the
thermistor decreases as temperature increases.
The BCM receives the fan ON and A/C ON signals from the A/C auto amp. and sends a compressor
BCM
ON request to the ECM.
Blower motor The blower motor varies the speed at which the air flows through the ventilation system.
The blower motor relay controls the flow of current to fuse 20, 21 and 22 in the Fuse Block (J/B).
Blower motor relay The relay is connected directly to ground, and is energized when the ignition switch is in the ON or
START position.

Revision: October 2013 HAC-10 2014 Sentra NAM

 COMPONENT PARTS
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Component Description
The ECM sends a compressor ON request to the IPDM E/R based on the status of engine A
operation and load as well as refrigerant pressure information. If all the conditions are met for A/C
ECM operation, the ECM transmits the compressor ON request to the IPDM E/R. The ECM shares the
refrigerant pressure sensor signal, engine RPM, and engine coolant temperature with the A/C auto
B
amp. via CAN communication line.
Located in the passenger compartment, behind the left lower IP, the Fuse Block (J/B) contains the
Fuse Block (J/B)
blower motor relay and several fuses required for the air conditioner control system.
C
The intake door motor controls the position of the intake door. Fresh air is allowed to enter the
cabin in one position, and recirculated inside air is allowed to enter in the other position. At times
the A/C auto amp. may command partial fresh or recirculation based on evaporator or coolant
temperatures. The intake door motor receives position commands from the A/C auto amp. and D
Intake door motor
reports actual door position back via an LCU (Local Control Unit) installed inside the motor. The
LCU reads the door po- sition from a Position Balanced Resistor (PBR), also part of the motor, and
returns that information to the A/C auto amp. The LCU switches the polarity of the circuits
connected to the DC motor to drive the motor forward or backward as requested by the A/C auto E
amp.
The intake sensor measures the temperature of the front evaporator fins. The sensor uses a ther-
Intake sensor mistor which is sensitive to the change in temperature. The electrical resistance of the thermistor
de- creases as temperature increases. F
In-vehicle sensor measures temperature of intake air that flows through aspirator to passenger
In-vehicle sensor room. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical
resis- tance of the thermistor decreases as temperature increases. G
IPDM E/R Refer to PCS-7, "RELAY CONTROL SYSTEM : System Description".
The mode door controls the direction the conditioned air passes through the ventilation system.
Through a series of levers and gears, the mode door controls the defrost door, the foot door, and H
Mode door motor the vent door. There are 5 preset positions: VENT, B/L, FOOT, D/F, and DEF. The FOOT position
can be set to allow some airflow through to the defroster vent, or to completely block the defroster
vent using the CONSULT. The mode door motor receives position commands from the A/C auto
amp. HAC
Refrigerant pressure sensor Refer to EC-29, "Refrigerant Pressure Sensor".
Sunload sensor measures sunload amount. This sensor is a dual system so that sunload for driver
Sunload sensor side and passenger side are measured separately. This sensor converts sunload amount to voltage J
signal by photodiode and transmits to A/C auto amp.

Revision: October 2013 HAC-11 2014 Sentra NAM

 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
SYSTEM
System Diagram INFOID:0000000009757619

ALIIA0707GB

System Description INFOID:0000000009757620

• Automatic air conditioning system is controlled by each function of A/C auto amp., ECM, IPDM E/R and
BCM.
Control by A/C auto amp.
- HAC-13, "Air Flow Control"
- HAC-14, "Air Inlet Control"
- HAC-15, "Air Outlet Control"

Revision: October 2013 HAC-12 2014 Sentra NAM

 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
- HAC-15, "Compressor Control"
- HAC-15, "Door Control" A
- HAC-20, "Temperature Control"
- Correction for input value of each sensor
Ambient sensor (setting temperature correction) B
• A/C auto amp. controls passenger room temperature so that the optimum level always matches the temper-
ature level that the passenger may feel. Correction is applied to the target temperature that is set using tem-
perature control dial, according to ambient temperature detected by ambient sensor. C
In-vehicle sensor [in-vehicle temperature correction]
• Passenger room temperature detected by in-vehicle sensor is corrected for each front air conditioning con-
trol (driver side and passenger side). D
Intake sensor (intake temperature correction)
• A/C auto amp. performs correction to change recognition intake temperature of A/C auto amp. quickly when
difference is large between recognition intake temperature and intake temperature detected by intake tem- E
perature sensor. The correction is performed to change recognition intake temperature slowly when differ-
ence is small.
Sunload sensor (sunload amount correction)
F
• Sunload amount detected by sunload sensor is corrected for each air conditioning control.
• A/C auto amp. performs correction to change recognition sunload amount of A/C auto amp. slowly when
sunload amount changes quickly, for example when entering or exiting a tunnel. G
Set temperature correction
• A/C auto amp. performs correction to the target temperature set by the temperature control switch so as to
match the temperature felt by the passengers depending on the ambient temperature detected by the ambi- H
ent sensor, and controls it so the in-vehicle temperature is always the most suitable.
Control by ECM
- Cooling fan control HAC
Refer to EC-47, "COOLING FAN CONTROL : System Description".
- Air conditioning cut control
Refer to EC-46, "AIR CONDITIONING CUT CONTROL : System Description". J
Control by IPDM E/R
- Relay control
Refer to PCS-7, "RELAY CONTROL SYSTEM : System Description". K
- Cooling fan control
Refer to EC-47, "COOLING FAN CONTROL : System Description".
Control by BCM
L
- Relay control
Refer to BCS-8, "BODY CONTROL SYSTEM : System Description".
M
Air Flow Control INFOID:0000000009757621

DESCRIPTION
• A/C auto amp. changes duty ratio of blower motor drive signal and controls air flow continuously. When air N
flow is increased, duty ratio of blower motor control signal gradually increases to prevent a sudden increase
in air flow.
• In addition to manual control and automatic control, air flow control consists of starting fan speed control, low O
coolant temperature starting control, high in-vehicle temperature starting control and fan speed control at
door motor operation
AUTOMATIC AIR FLOW CONTROL P
• A/C auto amp. decides target air flow depending on target air mix door opening angle.
• A/C auto amp. changes duty ratio of blower motor control signal and controls the air flow continuously so
that air flow matches the target air flow.

Revision: October 2013 HAC-13 2014 Sentra NAM

 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
• When air outlet is VENT or B/L, the minimum air flow is changed
depending on sunload.

JMIIA1129GB

STARTING AIR FLOW CONTROL

• When blower motor is activated, A/C auto amp. gradually
increases duty ratio of blower motor control signal to prevent a
sudden increase in discharge air flow.
• It takes approximately 8 seconds for air flow to reach HI from LOW.

JMIIA1130GB

LOW COOLANT TEMPERATURE STARTING CONTROL

If the engine coolant temperature is 56C (133F) or less, to prevent
a cold discharged air flow, A/C auto amp. suspends blower motor
activation for a maximum of 150 seconds depending on target air
mix door opening angle. After this, blower motor control signal is
increased gradually, and blower motor is activated.

JMIIA1227GB

HIGH IN-VEHICLE TEMPERATURE STARTING CONTROL

When front evaporator fin temperature is high [intake sensor value is 35C (95F) or more], to prevent a hot
discharged air flow, A/C auto amp. suspends blower motor activation for approximately 3 seconds so that
front evaporator is cooled by refrigerant.
FAN SPEED CONTROL AT DOOR MOTOR OPERATION
When mode door motor is activated while air flow is more than the specified value, A/C auto amp. reduces
fan speed temporarily so that mode door moves smoothly.
Air Inlet Control INFOID:0000000009757622

The intake door is automatically controlled by the temperature set-

ting, ambient temperature, in-vehicle temperature, intake tempera-
ture, amount of sunload and ON/OFF operation of the compressor.
Intake door automatic control selects FRE, 20% FRE, or REC
depending on a target air mix door opening angle, based on in-vehi-
cle temperature, ambient temperature, and sunload.

JMIIA0711GB

Revision: October 2013

HAC-14 2014 Sentra NAM
 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Air Outlet Control INFOID:0000000009757623

A
• While air outlet is in automatic control, A/C auto amp. selects the
mode door position depending on a target air mix door angle and
outlet air temperature calculated from sunload. B
• If ambient temperature is excessively low, D/F is selected to pre-
vent windshield fogging when air outlet is set to FOOT.

D
JMIIA0710GB

Compressor Control INFOID:0000000009757624

E
DESCRIPTION
• When the compressor activation condition is satisfied while blower motor is activated, A/C auto amp. trans-
mits A/C ON signal and blower fan ON signal to BCM. F
• BCM transmits the A/C ON signal and blower fan ON signal to the ECM via CAN communication line.
• ECM judges that the compressor can be activated depending on the state of each sensor (refrigerant pres-
sure sensor signal and others) and transmits A/C compressor request signal to IPDM E/R via CAN commu- G
nication.
• IPDM E/R turns A/C relay ON and activates the compressor depending on request from ECM.
COMPRESSOR PROTECTION CONTROL AT PRESSURE MALFUNCTION H
When high-pressure side value that is detected by refrigerant pressure sensor is as per the following state,
ECM requests IPDM E/R to turn A/C relay OFF and stops the compressor.
• 3.12 MPa (31.82 kg/cm2, 452.4 psi) or more (When the engine speed is less than 1,500 rpm) HAC
• 2.74 MPa (27.95 kg/cm2, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
• 0.14 MPa (1.43 kg/cm2, 20.3 psi) or less
J
COMPRESSOR OIL CIRCULATION CONTROL
When the engine starts while the engine coolant temperature is 56C (133F) or less, ECM activates the com-
pressor for approximately 6 seconds and circulates the compressor lubricant once.
K
LOW TEMPERATURE PROTECTION CONTROL
• When intake sensor detects that front evaporator fin temperature
is 2C (36F) or less, A/C auto amp. requests ECM to turn
compres-
L
sor OFF, and stops the compressor.
• When the front evaporator fin temperature returns to 3.5C (38F)
or more, the compressor is activated.
M

N
JMIIA1055GB

AIR CONDITIONING CUT CONTROL O

When set engine is running is excessively high load condition, ECM requests IPDM E/R to turn A/C relay
OFF, and stops the compressor. Refer to EC-46, "AIR CONDITIONING CUT CONTROL : System
Description".
Door Control INFOID:0000000009757625
P

AIR MIX DOOR MOTOR (DRIVER SIDE)

DESCRIPTION
• The step motor system is adopted for air mix door motor (driver side).
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor
rotates according to the drive signal, and then stops at the target door position.
 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]

Revision: October 2013 HAC-15 2014 Sentra NAM

 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
• Rotation of motor is transmitted to air mix door (driver side) [upper air mix door (driver side) and lower air
mix door (driver side)] by link, rod and lever, then air flow temperature (driver side) is switched.
DRIVE METHOD
• The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing pattern of excitation.

JMIIA1954GB

AIR MIX DOOR MOTOR (PASSENGER SIDE)

DESCRIPTION
• The step motor system is adopted for air mix door motor (passenger side).
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor
rotates according to the drive signal, and then stops at the target door position.
• Rotation of motor is transmitted to air mix door (passenger side) [upper air mix door (passenger side) and
lower air mix door (passenger side)] by link, rod and lever, then air flow temperature (passenger side) is
switched.
DRIVE METHOD
• The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing pattern of excitation.

JMIIA1955GB

MODE DOOR MOTOR

DESCRIPTION
• The step motor system is adopted for mode door motor.
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor
rotates according to the drive signal, and then stops at the target door position.
• Rotation of motor is transmitted to mode door (center ventilator and defroster door, sub defroster door, side
ventilator door, and foot door) by link, rod, and lever, then air outlet is switched.
DRIVE METHOD
• The 4 drive coils are excited in sequence in order to drive the motor.

Revision: October 2013 HAC-16 2014 Sentra NAM

 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
• Direction of rotation is changeable by recomposing pattern of excitation.
A

E
JZIIA0033GB

INTAKE DOOR MOTOR

• Intake door motor consists of motor that drives door and PBR (Potentio Balance Register) that detects door F
position.
• Motor operates intake door according to control signal from A/C auto amp.
• Rotation of motor is transmitted to intake door by lever, then air inlet is switched. G
• PBR (Potentio Balance Register) transmits PBR feedback signal to A/C auto amp. according to motor posi-
tion.
• According to PBR feedback signal, A/C auto amp. monitors that motor is in an appropriate door position.
H

HAC

M
JSIIA1633GB

SWITCHES AND THEIR CONTROL FUNCTION

N

Revision: October 2013 HAC-17 2014 Sentra NAM

 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]

JMIIA1958ZZ

Intake door Blower motor Air conditioner filter

Evaporator Upper air mix door (driver
side/pas- senger side) Lower air mix door (driver
side/pas- senger side)
Heater core Foot door Side ventilator door
Sub defroster door Center ventilator and defroster door

Fresh air intake Recirculation air Discharge air

Defroster Center ventilator Side ventilator

Rear ventilator Front foot Rear foot

Revision: October 2013

 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
HAC-18 2014 Sentra NAM
 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]

Door position A
Air mix door
Mode door (Passenger
(Driver side)
side) B

Center ventilator and defroster door

C

Intake door
Side ventilator door
Sub defroster door

Upper air mix door

Lower air mix door

Upper air mix door

Lower air mix door

Switch position

Foot door
D

AUTO switch AUTO F

MODE switch — G
— — — —

H
DEF switch

REC switch*

FRE switch* HAC

Full cold
DUAL 18C
Temperature control switch: J
18.5C – 31.5C AUTO
switch (Driver side) OFF
Full hot
32C
Full cold K
18C — — — —
Temperature control 18.5C – 31.5C AUTO — —
switch (Driver side)
Full hot — L
DUAL 32C
switch: Full cold
ON 18C
Temperature control M
switch (Passenger 18.5C – 31.5C AUTO
side) Full hot — —
32C
N
ON·OFF switch OFF — —

O
*: Inlet status is displayed by indicator during activating automatic control
AIR DISTRIBUTION
P

Revision: October 2013 HAC-19 2014 Sentra NAM

 SYSTEM
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]

Discharge air flow

Air outlet/distribution

MODE/DEF set- Ventilator Foot

ting position Front Defroster
Rear Front Rear
Center Side
48.7% 37.4% 13.9% — — —
26.6% 25.6% 13.2% 23.6% 11.0% —

— 15.6% 16.9% 32.9% 16.3% 18.3%

— 13.4% 15.1% 27.0% 14.3% 30.2%

— 17.5% 18.8% — — 63.7%

Temperature Control INFOID:0000000009757626

• When ignition switch is in the ON position, A/C auto amp. always

automatically controls temperature regardless of front air condi-
tioning operational state.
• A/C auto amp. calculates the target air mix door opening angle
depending on set temperature, in-vehicle temperature, ambient
temperature, and sunload.
• Air mix door is controlled depending on the comparison of current
air mix door opening angle and target air mix door opening angle.
• Regardless of in-vehicle temperature, ambient temperature, and
sunload, air mix door is fixed at the fully cold position when set
temperature is 18.0C (60F), and at the fully hot position when
JMIIA0731GB
set temperature is 32.0C (90F).
Fail-safe INFOID:0000000009757627

FAIL-SAFE FUNCTION
If a communication error exists between the A/C auto amp., and the AV control unit and preset switch for 30
seconds or longer, air conditioning is controlled under the following conditions:

A/C switch : ON
Air outlet : AUTO
Air inlet : FRE (Fresh air intake)
Blower fan speed : AUTO
Set temperature : Setting before communication error occurs

Revision: October 2013

HAC-20 2014 Sentra NAM
 OPERATION
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
OPERATION
A
Switch Name and Function INFOID:0000000009757628

CONTROL OPERATION B
A/C Switch Assembly

JMIIA1960ZZ
H

1. Temperature control switch (driver 2. ON/OFF switch 3. AUTO switch

side)
HAC
4. Fan control switch 5. A/C switch 6. DUAL switch
7. Temperature control switch (pas- 8. Recirculation switch 9. Fresh air switch
senger side)
10. Display 11. Mode switch 12. Defroster switch
J

Switch Operation
K
Switch name Function
Setting temperature can be set according to switch operation within a range between 18.0C – 32.0C
at a rate of 0.5C per adjustment. L
• Press : Setting temperature increases
Temperature control
switch (driver side) • Press : Setting temperature decreases
NOTE: M
When air conditioning is OFF, setting temperature can be set only while air conditioning status screen
(only when MODE switch is pressed) is indicated.
Air conditioning turns ON  OFF each time this switch is pressed.
N
• When this switch is pressed while air conditioning is ON
- Air conditioning turns OFF and becomes the following status, when this switch is pressed.
• Air outlet: FOOT
• Air flow: OFF O
ON·OFF switch
• Air inlet: Settings set before this switch is pressed
• A/C switch: OFF
• When this switch is pressed while air conditioning is OFF
- Air conditioning turns ON and operates according to the settings set before air conditioning is turned P
OFF, when this switch is pressed.

Revision: October 2013 HAC-21 2014 Sentra NAM

 OPERATION
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Switch name Function
• AUTO switch indicator turns ON and air conditioning becomes the following status, when this switch
is pressed while air conditioning is ON.
- Air outlet: Automatic control
- Air flow: Automatic control
- Air inlet: Settings set before this switch is pressed
- A/C switch: ON
• Air conditioning turns ON and operates according to the following status, when this switch is
AUTO switch pressed while air conditioning is OFF. (AUTO switch indicator turns ON)
- Air outlet: Automatic control
- Air flow: Automatic control
- Air inlet: Settings set before this switch is pressed
- A/C switch: ON
NOTE:
When air outlet or air flow is manually operated while AUTO switch indicator is ON, AUTO switch
indica- tor turns OFF. However, automatic control continues for other functions than air outlet or air
flow.
• Air flow can be set within a range between 1st – 7th speed according to switch operation.
-
Press +: Air flow increases
-
Press : Air flow decreases
• Air conditioning turns ON and operates according to the following status, when this switch is
pressed while air conditioning is OFF.
Fan switch - Air outlet: Automatic control
- Air flow: 1st speed
- Air inlet: Settings set before this switch is pressed
- A/C switch: Settings set before air conditioning is turned OFF
NOTE:
Automatic air flow control is cancelled (AUTO switch indicator turns OFF), when fan switch is pressed
while AUTO switch indicator is ON.
Compressor control (switch indicator) changes between ON  OFF each time this switch is pressed
while blower motor is operated.
A/C switch
NOTE:
A/C switch cannot be turned ON when blower motor is OFF.
Left and right ventilation temperature separately control (switch indicator) changes between ON 
OFF each time this switch is pressed while blower motor is operated.
NOTE:
DUAL switch
• Setting temperature for passenger side is the same as that for driver side when left and right
ventilation temperature separately control is OFF.
• DUAL switch operation is not accepted when DEF mode is ON.
• Left and right ventilation temperature separately control (DUAL switch indicator) turns ON according
to switch operation. Air flow temperature of passenger side can be changed without changing air
flow temperature of driver side.
• Setting temperature can be set according to switch operation within a range between 18.0C –
Temperature control 32.0C at a rate of 0.5C per adjustment.
switch (passenger - Press : Setting temperature increases
side) - Press : Setting temperature decreases
NOTE:
• When air conditioning is OFF, setting temperature can be set only while air conditioning status
screen (only when MODE switch is pressed) is indicated.
• Temperature control switch (passenger side) operation is not accepted when DEF mode is ON.
Switch indicator turns ON and air inlet is set to recirculation (REC), when this switch is pressed.
REC switch NOTE:
Air inlet can be changed when air conditioning is in OFF status.
Switch indicator turns ON and air inlet is set to fresh air intake (FRE), when this switch is pressed.
FRE switch NOTE:
Air inlet can be changed when air conditioning is in OFF status.
 OPERATION
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Revision: October 2013
HAC-22 2014 Sentra NAM
 OPERATION
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Switch name Function
Air outlet changes from VENT B/L  FOOT  D/F  VENT each time this switch is pressed. A
NOTE:
MODE switch • Air outlet can be changed when air conditioning is in OFF status.
• Automatic air outlet control is cancelled (AUTO switch indicator turns OFF), when MODE switch B
is pressed while AUTO switch indicator is ON.
DEF mode (switch indicator) changes between ON  OFF each time switch is pressed.
• When this switch is pressed while air conditioning is ON
- Air conditioning becomes the following status when DEF mode is turned ON. C
• Air outlet: DEF
• Air flow: Settings set before DEF mode is turned ON
• Air inlet: Fresh air intake
• A/C switch: ON
D
- Air conditioning becomes the following status when DEF mode is turned OFF.
• Air outlet: Settings set before DEF mode is turned ON
• Air flow: Settings set before DEF mode is turned OFF E
• Air inlet: Settings set before DEF mode is turned OFF
• A/C switch: Settings set before DEF mode is turned OFF
• When this switch is pressed while air conditioning is OFF
DEF switch
- Air conditioning turns ON and operates in the following status, when DEF mode is turned ON. F
• Air outlet: DEF
• Air flow: Automatic control
• Air inlet: Fresh air intake
• A/C switch: ON G
- Air conditioning becomes the following status when DEF mode is turned OFF.
• Air outlet: Automatic control
• Air flow: Settings set before DEF mode is turned OFF
• Air inlet: Settings set before DEF mode is turned OFF H
• A/C switch: Settings set before DEF mode is turned OFF
NOTE:
When DEF mode is turned ON while AUTO switch indicator is turned ON, AUTO switch indicator turns
HAC
OFF. However, automatic air flow control continues.

Revision: October 2013 HAC-23 2014 Sentra NAM

 DIAGNOSIS SYSTEM (A/C AUTO AMP.)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (A/C AUTO AMP.)
Description INFOID:0000000009757629

Air conditioning system performs self-diagnosis, operation check, function diagnosis, and various settings
using diagnosis function of each control unit.

Diagnostic item
ECU
(CONSULT)
Self Diagnostic Result
Data Monitor
A/C auto amp. HVAC Active Test
Work support
Self Diagnostic Result
BCM BCM-AIR CONDITIONER Data Monitor
Self Diagnostic Result
ECM ENGINE Data Monitor
Self Diagnostic Result
IPDM E/R IPDM E/R Data Monitor
Auto active test

CONSULT Function (HVAC) INFOID:0000000009757630

CONSULT can display each diagnosis item using the diagnosis test modes as shown.
CONSULT application items
Diagnosis mode Description
Self-Diagnostic Result Displays the diagnosis results judged by A/C auto amp.
Data Monitor Displays A/C auto amp. input/output data in real time.
Work support Changes the setting for each system function.
Active Test The signals used to activate each device are forcibly supplied from A/C auto amp.
ECU Identification Displays the A/C auto amp. number.

SELF-DIAGNOSTIC RESULT
Refer to HAC-38, "DTC Index".
Display Item List

Items
DTC Diagnostic item is detected when... Possible cause
(CONSULT screen terms)
When A/C auto amp. is not
U1000 CAN COMM CIRCUIT transmitting or receiving CAN CAN communication system
communication signal for 2 or more
seconds.
When detecting error during the initial
U1010 CONTROL UNIT (CAN) diagnosis of CAN controller of A/C auto A/C auto amp.
amp.
Detected temperature at ambient sen- • Ambient sensor
B257B AMB TEMP SEN (SHORT)
sor 55C (131F) or more • A/C auto amp.
• Harness and connector
Detected temperature at ambient sen- (Ambient sensor circuit is
B257C AMB TEMP SEN (OPEN)
sor 30C (22F) or less open, or there is a short in the
circuit)
IN-CAR SENSOR (OUT OF RANGE Detected temperature at in-vehicle • In-vehicle sensor
B2578
[LOW]) sen- sor 55C (131F) or more • A/C auto amp.
• Harness and connector
IN-CAR SENSOR (OUT OF RANGE Detected temperature at in-vehicle (In-vehicle sensor circuit is open,
B2579
[HI]) sen- sor 30C (22F) or less or there is a short in the circuit)

Revision: October 2013

HAC-24 2014 Sentra NAM
 DIAGNOSIS SYSTEM (A/C AUTO AMP.)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Items
DTC Diagnostic item is detected when... Possible cause
(CONSULT screen terms) A
Detected temperature at intake sensor • Intake sensor
B2581 EVAP TEMP SEN (SHORT)
55C (131F) or more • A/C auto amp.
• Harness and connector B
Detected temperature at intake sensor (Intake sensor circuit is open, or
B2582 EVAP TEMP SEN (OPEN)
30C (22F) or less there is a short in the circuit)
Detected calorie at sunload sensor • Sunload sensor
B2630* SUNLOAD SEN (SHORT) 2 2 • A/C auto amp. C
1395 w/m (1200 kcal/m ·h)
• Harness and connector
Detected calorie at sunload sensor 0 (Sunload sensor circuit is
B2631* SUNLOAD SEN (OPEN)
w/ m2 (0 kcal/m2·h) open, or there is a short in the
circuit) D
Short or open circuit of air mix door
B27A2
mo- tor drive signal terminal 1.
Short or open circuit of air mix door • Air mix door motor LH E
B27A3 • A/C auto amp.
mo- tor drive signal terminal 2.
DR AIRMIX ACTR • Harness and connector
Short or open circuit of air mix door (Air mix door motor is open or
B27A4
mo- tor drive signal terminal 3. shorted) F
Short or open circuit of air mix door
B27A5
mo- tor drive signal terminal 4.

B27AA
Short or open circuit of air mix door G
mo- tor drive signal terminal 1.
Short or open circuit of air mix door • Air mix door motor RH
B27AB • A/C auto amp.
mo- tor drive signal terminal 2. H
AS AIRMIX ACTR • Harness and connector
Short or open circuit of air mix door (Air mix door motor is open or
B27AC
mo- tor drive signal terminal 3. shorted)
Short or open circuit of air mix door HAC
B27AD
mo- tor drive signal terminal 4.
PBR opening angle of intake door mo-
tor is 50% or more. (PBR feedback sig-
B27A0
nal voltage of intake door motor is 2.5V • Intake door motor
J
or more) • A/C auto amp.
INTAKE ACTR • Harness and connector
PBR opening angle of intake door mo- (Intake door motor is open
tor is 30% or less. (PBR feedback sig- or shorted) K
B27A1
nal voltage of intake door motor is
1.5V or less)
Short or open circuit of air mix door L
B27A6
mo- tor drive signal terminal 1.
Short or open circuit of air mix door • Mode door motor
B27A7 • A/C auto amp.
mo- tor drive signal terminal 2.
MODE DOOR ACTR • Harness and connector M
Short or open circuit of air mix door
B27A8 (Mode door motor is open
mo- tor drive signal terminal 3.
or shorted)
Short or open circuit of air mix door
B27A9 N
mo- tor drive signal terminal 4.

*: Perform self-diagnosis under sunshine. When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise self-
diag- nosis reports an error even though the sunload sensor is functioning normally.
O
DATA MONITOR
Display item list
P Monitor item [Unit] Description
Ambient sensor value converted from ambient sensor signal received from ambient
AMB TEMP SEN [C]
sensor
In-vehicle sensor value converted from in-vehicle sensor signal received from in-vehi-
IN-VEH TEMP []
cle sensor
INT TEMP SEN [C] Intake sensor value converted from intake sensor signal received from intake sensor

Revision: October 2013 HAC-25 2014 Sentra NAM

 DIAGNOSIS SYSTEM (A/C AUTO AMP.)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Monitor item [Unit] Description
Sunload sensor value converted from sunload sensor signal received from sunload
SUNLOAD SEN [w/m2] sensor

AMB SEN CAL [] Ambient sensor value calculated by A/C auto amp.
IN-VEH CAL [C] In-vehicle sensor value calculated by A/C auto amp.
INT TEMP CAL [C] Intake sensor value calculated by A/C auto amp.
SUNL SEN CAL [w/m2] Sunload sensor value calculated by A/C auto amp.
COMP REQ SIG [On/Off] Displays A/C switch ON/OFF status transmitted to other units via CAN communication
Displays blower switch ON/OFF status transmitted to other units via CAN communica-
FAN REQ SIG [On/Off]
tion
FAN DUTY [%] Duty ratio of blower motor judged by A/C auto amp.
Target discharge air temperature judged by A/C auto amp. according to the tempera-
XM
ture setting and the value from each sensor
ENG COOL TEMP [C] Water temperature signal value received from ECM via CAN communication
[km/h
VEHICLE SPEED Vehicle speed signal value received from meter via CAN communication
(mph)]

WORK SUPPORT

Work item Description Reference

TEMP SET CORRECT If the temperature felt by the customer is different than the airflow
(Setting of difference between tem- temperature controlled by the temperature setting, the auto ampli- HAC-55, "Temperature
perature setting and control tempera- fier control temperature can be adjusted to compensate for the Setting Trimmer"
ture) temperature setting.
• If the ignition switch is turned to the OFF position while the
REC switch is set to ON (recirculation), “With” or “Without” of
the REC switch ON (recirculation) condition can be selected.
REC MEMORY SET HAC-56, "Inlet Port
• If “With” was set, the REC switch will be ON (recirculation)
(REC memory function setting) Memory Function (REC)"
when turning the ignition switch to the ON position again.
• If “Without” was set, the air inlets will be controlled
automatically when turning the ignition switch to the ON
position again.
• If the ignition switch is turned to the OFF position while the
FRE switch is set to ON (fresh air intake), “With” or “Without”
of the FRE switch ON (fresh air intake) condition can be
FRE MEMORY SET selected. HAC-55, "Inlet Port
(FRE memory function setting) • If “With” was set, the FRE switch will be ON (fresh air Memory Function (FRE)"
intake) when turning the ignition switch to the ON position
again.
• If “Without” was set, the air inlets will be controlled
automatically when turning the ignition switch to the ON
position again.
Starting position reset of air mix door motor and mode door motor HAC-57, "Work Proce-
Door Motor Starting Position Reset
can be performed. dure"
TARGET EVAPORATOR TEMP UP- HAC-56, "Target Evapo-
Set the target evaporator upper temperature limit.
PER LIMIT SETTING rator Temp Upper Limit"
NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of
WORK SUPPORT may be cancelled.

ACTIVE TEST

Test item Description

ALL SEG All switch indicator and display indication are turned ON.
The operation check of A/C system can be performed by selecting the mode. Refer to the fol-
HVAC TEST
lowing table for the conditions of each mode.

HVAC TEST
 DIAGNOSIS SYSTEM (A/C AUTO AMP.)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Revision: October 2013
HAC-26 2014 Sentra NAM
 DIAGNOSIS SYSTEM (A/C AUTO AMP.)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]

Test item A
MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7
Mode door position VENT VENT B/L B/L D/F1 D/F2 DEF
Intake door position REC REC REC 20%FRE FRE FRE FRE B
Air mix door position
(driver & passenger FULL COLD FULL COLD FULL COLD 50% 50% FULL HOT FULL HOT
side) C
Blower motor (Applied
30% 30% 60% HI HI 60% HI
voltage)
A/C compressor (Mag- D
ON ON ON ON OFF OFF ON
net clutch)
ECV duty 80% 80% 40% 40% 0% 0% 90%
Blower fan ON signal ON ON ON ON OFF OFF ON E

NOTE:
Perform the inspection of each output device after starting the engine, because the A/C compressor has been operating.
F

HAC

Revision: October 2013 HAC-27 2014 Sentra NAM

 DIAGNOSIS SYSTEM (BCM)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (BCM)
COMMON ITEM
COMMON ITEM : CONSULT Function (BCM - COMMON ITEM) INFOID:0000000010291107

APPLICATION ITEM
CONSULT performs the following functions via CAN communication with BCM.

Direct Diagnostic Mode Description

ECU identification The BCM part number is displayed.
Self Diagnostic Result The BCM self diagnostic results are displayed.
Data Monitor The BCM input/output data is displayed in real time.
Active Test The BCM activates outputs to test components.
Work support The settings for BCM functions can be changed.
• The vehicle specification can be read and saved.
Configuration
• The vehicle specification can be written when replacing BCM.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication is displayed.

SYSTEM APPLICATION
BCM can perform the following functions.

Direct Diagnostic Mode

CAN DIAG SUPPORT MNTR

Self Diagnostic Result
ECU identification

System Sub System

Configuration
Work support
Data Monitor

Active Test

Door lock DOOR LOCK    

Rear window defogger REAR DEFOGGER  
Warning chime BUZZER  
Interior room lamp timer INT LAMP   
Exterior lamp HEAD LAMP   
Wiper and washer WIPER   
Turn signal and hazard warning lamps FLASHER   
Air conditioner AIR CONDITIONER 
Intelligent Key system INTELLIGENT KEY    
Combination switch COMB SW 
BCM BCM     
Immobilizer IMMU    
Interior room lamp battery saver BATTERY SAVER   
Trunk open TRUNK 
Vehicle security system THEFT ALM   
RAP system RETAINED PWR 
Signal buffer system SIGNAL BUFFER 
TPMS AIR PRESSURE MONITOR    

Revision: October 2013

HAC-28 2014 Sentra NAM
 DIAGNOSIS SYSTEM (BCM)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER
A
AIR CONDITIONER : CONSULT Function (BCM - AIR CONDITIONER) INFOID:0000000010291108

DATA MONITOR B

Monitor Item [Unit] Description

FAN ON SIG [On/Off] Indicates condition of fan switch. C
AIR COND SW [On/Off] Indicates condition of A/C switch.

HAC

Revision: October 2013 HAC-29 2014 Sentra NAM

 DIAGNOSIS SYSTEM (IPDM E/R)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (IPDM E/R)
Diagnosis Description INFOID:0000000010291109

AUTO ACTIVE TEST

Description
In auto active test, the IPDM E/R sends a drive signal to the following systems to check their operation.
• Front wiper (LO, HI)
• Parking lamp
• License plate lamp
• Tail lamp
• Front fog lamp (if equipped)
• Headlamp (LO, HI)
• A/C compressor (magnet clutch)
• Cooling fan
Operation Procedure
NOTE:
Never perform auto active test in the following conditions.
• Passenger door is open
• CONSULT is connected
1. Close the hood and lift the wiper arms from the windshield. (Prevent windshield damage due to wiper
operation)
NOTE:
When auto active test is performed with hood opened, sprinkle water on windshield beforehand.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON, and within 20 seconds, press the driver door switch 10 times. Then turn the
ignition switch OFF.
4. Turn the ignition switch ON within 10 seconds. After that the horn sounds once and the auto active test
starts.
5. After a series of the following operations is repeated 3 times, auto active test is completed.
NOTE:
• When auto active test has to be cancelled halfway through test, turn the ignition switch OFF.
• When auto active test is not activated, door switch may be the cause. Check door switch. Refer to DLK-
103, "Component Inspection".
Inspection in Auto Active Test
When auto active test is actuated, the following operation sequence is repeated 3 times.

Operation se-
Inspection location Operation
quence
1 Front wiper LO for 5 seconds  HI for 5 seconds
• Parking lamp
• License plate lamp
2 10 seconds
• Tail lamp
• Front fog lamp (if equipped)
3 Headlamp LO for 10 seconds HI ON  OFF 5 times
4 A/C compressor (magnet clutch) ON  OFF 5 times
5 Cooling fan LO for 5 seconds  MID for 3 seconds  HI for 2 seconds

Revision: October 2013

HAC-30 2014 Sentra NAM
 DIAGNOSIS SYSTEM (IPDM E/R)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Concept of Auto Active Test
A

AWMIA1509GB F
• IPDM E/R starts the auto active test with the door switch signals transmitted by BCM via CAN communica-
tion. Therefore, the CAN communication line between IPDM E/R and BCM is considered normal if the auto
active test starts successfully.
• The auto active test facilitates troubleshooting if any systems controlled by IPDM E/R cannot be operated. G

Diagnosis Chart in Auto Active Test

H
Symptom Inspection contents Possible cause
Any of the following components do not operate YES BCM signal input circuit
• Parking lamp
• License plate lamp Perform auto active test. • Lamp or motor HAC
• Tail lamp Does the applicable system op- • Lamp or motor ground circuit
• Front fog lamp (if equipped) erate? NO • Harness or connector between
• Headlamp (HI, LO) IPDM E/R and applicable
• Front wiper (HI, LO) system J
• IPDM E/R
• BCM signal input circuit
• CAN communication signal
YES be- tween BCM and ECM K
Perform auto active test. • CAN communication signal
A/C compressor does not operate Does the magnet clutch oper- be- tween ECM and IPDM E/R
ate? • Magnet clutch L
• Harness or connector
NO
between IPDM E/R and
magnet clutch
• IPDM E/R M
• ECM signal input circuit
YES • CAN communication signal
be- tween ECM and IPDM E/R
Perform auto active test. N
Cooling fan does not operate • Cooling fan motor
Does the cooling fan
operate? • Harness or connector between
NO
IPDM E/R and cooling fan
motor O
CONSULT Function (IPDM E/R) INFOID:0000000010291110

APPLICATION ITEM P
CONSULT performs the following functions via CAN communication with IPDM E/R.

Direct Diagnostic Mode Description

Ecu Identification The IPDM E/R part number is displayed.
Self Diagnostic Result The IPDM E/R self diagnostic results are displayed.
Data Monitor The IPDM E/R input/output data is displayed in real time.

Revision: October 2013

HAC-31 2014 Sentra NAM
 DIAGNOSIS SYSTEM (IPDM E/R)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Direct Diagnostic Mode Description
Active Test The IPDM E/R activates outputs to test components.
CAN Diag Support Mntr The result of transmit/receive diagnosis of CAN communication is displayed.

ECU IDENTIFICATION
The IPDM E/R part number is displayed.
SELF DIAGNOSTIC RESULT
Refer to PCS-20, "DTC Index".
DATA MONITOR

Main
Monitor Item [Unit] Description
Signals
Indicates cooling fan speed signal received from ECM on CAN communication
MOTOR FAN REQ [%] 
line
Indicates A/C compressor request signal received from ECM on CAN commu-
AC COMP REQ [On/Off] 
nication line
Indicates position light request signal received from BCM on CAN communica-
TAIL&CLR REQ [On/Off] 
tion line
Indicates low beam request signal received from BCM on CAN communication
HL LO REQ [On/Off] 
line
Indicates high beam request signal received from BCM on CAN
HL HI REQ [On/Off] 
communication line
Indicates front fog light request signal received from BCM on CAN communica-
FR FOG REQ [On/Off] 
tion line
Indicates front wiper request signal received from BCM on CAN
FR WIP REQ [Stop/1LOW/Low/Hi] 
communication line
WIP AUTO STOP [STOP P/ACT P]  Indicates condition of front wiper auto stop signal
WIP PROT [Off/BLOCK]  Indicates condition of front wiper fail-safe operation
Indicates ignition switch ON signal received from BCM on CAN communication
IGN RLY1 -REQ [On/Off]
line
IGN RLY [On/Off]  Indicates condition of ignition relay
PUSH SW [On/Off] Indicates condition of push-button ignition switch
INTER/NP SW [On/Off] Indicates condition of CVT shift position
Indicates starter relay status signal received from BCM on CAN
ST RLY CONT [On/Off]
communication line
Indicates starter control relay signal received from BCM on CAN
IHBT RLY -REQ [On/Off]
communication line
ST/INHI RLY [Off/ ST /INHI] Indicates condition of starter relay and starter control relay
DETENT SW [On/Off] Indicates condition of CVT shift selector (park position switch)
Indicates daytime light request signal received from BCM on CAN communica-
DTRL REQ [Off]
tion line
Indicates theft warning horn request signal received from BCM on CAN
THFT HRN REQ [On/Off]
commu- nication line
HORN CHIRP [On/Off] Indicates horn reminder signal received from BCM on CAN communication line

ACTIVE TEST

Test item Description

HORN This test is able to check horn operation [On].
REAR DEFOGGER This test is able to check rear window defogger operation [On/Off].
FRONT WIPER This test is able to check wiper motor operation [Hi/Lo/Off].

Revision: October 2013

HAC-32 2014 Sentra NAM
 DIAGNOSIS SYSTEM (IPDM E/R)
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONER]
Test item Description
MOTOR FAN This test is able to check cooling fan operation [4/3/2/1]. A
EXTERNAL LAMPS This test is able to check external lamp operation [Fog/Hi/Lo/TAIL/Off].

CAN DIAG SUPPORT MNTR B

Refer to LAN-13, "CAN Diagnostic Support Monitor".

HAC

Revision: October 2013 HAC-33 2014 Sentra NAM

 A/C AUTO AMP.
< ECU DIAGNOSIS INFORMATION > [AUTOMATIC AIR CONDITIONER]

ECU DIAGNOSIS INFORMATION

A/C AUTO AMP.
Reference Value INFOID:0000000009757635

VALUES ON THE DIAGNOSIS TOOL

Monitor item Condition Value/Status

AMB TEMP SEN Ignition switch ON — 22 - 131F (30 - 55C)
IN-VEH TEMP Ignition switch ON — 22 - 131F (30 - 55C)
INT TEMP SEN Ignition switch ON — 22 - 131F (30 - 55C)

0 - 1395 w/m2
SUNLOAD SEN Ignition switch ON —
(0 - 1200 kcal/m2·h)
AMB SEN CAL Ignition switch ON — 22 -131F (30 - 55C)
IN-VEH CAL Ignition switch ON — 22 -131F (30 - 55C)
INT TEMP CAL Ignition switch ON — 22 -131F (30 - 55C)

0 - 1395 w/m2
SUNL SEN CAL Ignition switch ON —
(0 - 1200 kcal/m2·h)
A/C switch: ON
Engine: Run at idle after (A/C compressor operation On
COMP REQ SIG status)
warming up
A/C switch: OFF Off

Engine: Run at idle after Blower fan: ON On

FAN REQ SIG
warming up Blower fan: OFF Off

Engine: Run at idle after Blower fan: ON 25 - 85%

FAN DUTY
warming up Blower fan: OFF 0%
XM Ignition switch ON — 100 - 155
Values according to coolant
ENG COOL TEMP Ignition switch ON —
temperature
Equivalent to speedometer
VEHICLE SPEED Driving —
reading

TERMINAL LAYOUT

ALIIA0579ZZ

PHYSICAL VALUES

Revision: October 2013

HAC-34 2014 Sentra NAM
 A/C AUTO AMP.
< ECU DIAGNOSIS INFORMATION > [AUTOMATIC AIR CONDITIONER]

Terminal No. A
Description
(Wire color)
Condition Value
Input/
+  Signal name
Output
B

ACTIVE
TEST C
1 30 Ignition
ECV control signal Output (HVAC
(GR) (B) switch ON
TEST:
MODE4)
D
SJIA1607E

0 – 4.8 V
2 30
In-vehicle sensor signal Input Ignition switch ON Output voltage varies with in-ve-
(LG) (B)
hicle temperature
E
0 – 4.8 V
3 30
Intake sensor signal Input Ignition switch ON Output voltage varies with evapo-
(L) (B)
rator fin temperature F
0 – 4.8 V
4 30
Ambient sensor signal Input Ignition switch ON Output voltage varies with ambi-
(GR) (B)
ent temperature G
0 – 4.8 V
5 30
Sunload sensor signal Input Ignition switch ON Output voltage varies with sun-
(G) (B)
load amount
H
6 Input/
— CAN-H — —
(L) Output
7 Input/
— CAN-L — — HAC
(P) Output
8 30 Intake door motor PBR power
Output Ignition switch ON 4.8 – 5.2 V
(W) (B) supply
J
9 30 A/C auto amp. connection rec-
Output Ignition switch ON 11 – 14 V
(GR) (B) ognition signal
10 30
Sensor ground — Ignition switch ON 0 – 0.1 V K
(L) (B)
11 30
Ignition power supply Input Ignition switch ON 11 – 14 V
(LG) (B)
12 30
L
Battery power supply Input Ignition switch OFF 11 – 14 V
(SB) (B)

M
• Ignition switch ON
13 30
Power transistor control signal Output • Blower motor: 1st speed
(V) (B)
(manual) N

ZJIA0863J

Revision: October 2013 HAC-35 2014 Sentra NAM

 A/C AUTO AMP.
< ECU DIAGNOSIS INFORMATION > [AUTOMATIC AIR CONDITIONER]
Terminal No.
Description
(Wire color)
Condition Value
Input/
+  Signal name
Output

• Ignition switch ON
• Blower motor: OFF

14 30 JMIIA0941GB
Blower fan ON signal Output
(LG) (B)

• Ignition switch ON
• Blower motor: ON

PKIB4960J

• Ignition switch ON
• A/C switch: OFF (A/C
indi- cator: OFF)

15 30 JPMIA0012GB
A/C ON signal Output
(Y) (B)

• Ignition switch ON
• A/C switch: ON (A/C
indi- cator: ON)

JMIIA0941GB

16 30 Defroster OFF 0V
RR DEF signal Output
(W) (B) switch ON 12 V
17 30 A/MIX
(BR) (B) drive 4
18 30 A/MIX • Ignition switch ON
(SB) (B) drive 3 Air mix door motor
• Right after the tempera-
(passenger side) Output
19 30 A/MIX ture control switch
drive signal
(LG) (B) drive 2 (pas- senger side)
operation
20 30 A/MIX
JPIIA1647GB
(L) (B) drive 1
21 30
Ignition power supply Input Ignition switch ON 11 – 14 V
(W) (B)
• Ignition switch ON
0.2 – 0.8 V
22 30 Intake door motor PBR • Intake switch: REC
Input
(SB) (B) feedback signal • Ignition switch ON
4.2 – 4.8 V
• Intake switch: FRE

25 30 Defroster OFF 0V
RR DEF feedback Input
(R) (B) switch ON 12 V

Revision: October 2013 HAC-36 2014 Sentra NAM

 A/C AUTO AMP.
< ECU DIAGNOSIS INFORMATION > [AUTOMATIC AIR CONDITIONER]
Terminal No.
Description
(Wire color) A
Condition Value
Input/
+  Signal name
Output
B

27 30 Communication signal (A/C con-

Input Ignition switch ON C
(LG) (B) trol  A/C auto amp.)

SJIA1522J D

E
28 30 Communication signal (A/C auto
Output Ignition switch ON
(BR) (B) amp.  A/C control)

F
SJIA1521J

30
Ground Ground — Ignition switch ON 0 – 0.1 V
(B) G
31 30 A/MIX
(P) (B) drive 4
32 30 A/MIX H
• Ignition switch ON
(BR) (B) drive 3 Air mix door motor
• Right after the tempera-
(driver side) drive Output
33 30 A/MIX ture control switch (driver
signal
(R) (B) drive 2 side) operation HAC
34 30 A/MIX
JPIIA1647GB
(W) (B) drive 1
• Ignition switch ON J
• Intake switch: REC  9.5 – 13.5 V
35 30 FRE
FRE
(G) (B) • Ignition switch ON K
• Intake switch: FRE  0–1V
Intake door motor REC
Output
drive signal • Ignition switch ON
• Intake switch: FRE  9.5 – 13.5 V L
36 30 REC
REC
(V) (B) • Ignition switch ON
• Intake switch: REC  0–1V M
FRE
37 30 MODE
(GR) (B) drive 4 N
38 30 MODE
(G) (B) drive 3 • Ignition switch ON
Mode door motor
Output • Right after the MODE
39 30 MODE drive signal
switch operation O
(Y) (B) drive 2
40 30 MODE
(O) (B) drive 1 JPIIA1647GB

DTC Inspection Priority Chart INFOID:0000000009757636

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.

Revision: October 2013 HAC-37 2014 Sentra NAM

 A/C AUTO AMP.
< ECU DIAGNOSIS INFORMATION > [AUTOMATIC AIR CONDITIONER]

Priority Detected items (DTC)

• U1000: CAN COMM CIRCUIT
1
• U1010: CONTROL UNIT (CAN)
• B257B: AMB TEMP SEN (SHORT)
• B257C: AMB TEMP SEN (OPEN)
• B2578: IN CAR SENSOR (OUT OF RANGE[LOW])
• B2579: IN CAR SENSOR (OUT OF RANGE[HI])
• B2581: EVAP TEMP SEN (SHORT)
• B2582: EVAP TEMP SEN (OPEN)
• B2630: SUNLOAD SEN (SHORT)
• B2631: SUNLOAD SEN (OPEN)
• B27A2: DR AIRMIX ACTR (TERMINAL 1)
• B27A3: DR AIRMIX ACTR (TERMINAL 2)
• B27A4: DR AIRMIX ACTR (TERMINAL 3)
2
• B27A5: DR AIRMIX ACTR (TERMINAL 4)
• B27AA: PASS AIRMIX ACTR (TERMINAL 1)
• B27AB: PASS AIRMIX ACTR (TERMINAL 2)
• B27AC: PASS AIRMIX ACTR (TERMINAL 3)
• B27AD: PASS AIRMIX ACTR (TERMINAL 4)
• B27A0: INTAKE ACTR (OUT OF RANGE[HI])
• B27A1: INTAKE ACTR (OUT OF RANGE[LOW])
• B27A6: MODE ACTR (TERMINAL 1)
• B27A7: MODE ACTR (TERMINAL 2)
• B27A8: MODE ACTR (TERMINAL 3)
• B27A9: MODE ACTR (TERMINAL 4)

DTC Index INFOID:0000000009757637

Items
DTC Reference
(CONSULT screen terms)
U1000 CAN COMM CIRCUIT HAC-58, "DTC Logic"
U1010 CONTROL UNIT (CAN) HAC-59, "DTC Logic"
B2578 IN-VEHICLE SENSOR HAC-60, "DTC Logic"
B2579 IN-VEHICLE SENSOR HAC-60, "DTC Logic"
B257B AMBIENT SENOR HAC-63, "DTC Logic"
B257C AMBIENT SENOR HAC-63, "DTC Logic"
B2581 INTAKE SENSOR HAC-66, "DTC Logic"
B2582 INTAKE SENSOR HAC-66, "DTC Logic"

B2630* SUNLOAD SENSOR HAC-69, "DTC Logic"

B2631* SUNLOAD SENSOR HAC-69, "DTC Logic"

B27A0 INTAKE DOOR MOTOR HAC-79, "DTC Logic"
B27A1 INTAKE DOOR MOTOR HAC-79, "DTC Logic"
B27A2 DR AIR MIX DOOR MOT HAC-72, "DTC Logic"
B27A3 DR AIR MIX DOOR MOT HAC-72, "DTC Logic"
B27A4 DR AIR MIX DOOR MOT HAC-72, "DTC Logic"
B27A5 DR AIR MIX DOOR MOT HAC-72, "DTC Logic"
B27AA AS AIR MIX DOOR MOT HAC-74, "DTC Logic"
B27AB AS AIR MIX DOOR MOT HAC-74, "DTC Logic"
B27AC AS AIR MIX DOOR MOT HAC-74, "DTC Logic"
B27AD AS AIR MIX DOOR MOT HAC-74, "DTC Logic"
B27A6 MODE DOOR MOTOR HAC-77, "DTC Logic"
B27A7 MODE DOOR MOTOR HAC-77, "DTC Logic"

Revision: October 2013

HAC-38 2014 Sentra NAM
 A/C AUTO AMP.
< ECU DIAGNOSIS INFORMATION > [AUTOMATIC AIR CONDITIONER]
Items
DTC Reference
(CONSULT screen terms) A
B27A8 MODE DOOR MOTOR HAC-77, "DTC Logic"
B27A9 MODE DOOR MOTOR HAC-77, "DTC Logic"
B
*: Perform self-diagnosis under direct sunlight. When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise self-
diagnosis reports an error even though the sunload sensor is functioning normally.

HAC

Revision: October 2013 HAC-39 2014 Sentra NAM

 ECM, IPDM E/R, BCM
< ECU DIAGNOSIS INFORMATION > [AUTOMATIC AIR CONDITIONER]
ECM, IPDM E/R, BCM
List of ECU Reference INFOID:0000000009757638

ECU Reference
EC-77, "Reference Value"
EC-90, "Fail Safe"
ECM
EC-93, "DTC Inspection Priority Chart"
EC-94, "DTC Index"
PCS-13, "Reference Value"
IPDM E/R PCS-19, "Fail-safe"
PCS-20, "DTC Index"
BCS-29, "Reference Value"
BCS-46, "Fail-safe"
BCM
BCS-48, "DTC Inspection Priority Chart"
BCS-49, "DTC Index"

Revision: October 2013

HAC-40 2014 Sentra NAM
 AUTOMATIC AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [AUTOMATIC AIR CONDITIONER]

WIRING DIAGRAM A
AUTOMATIC AIR CONDITIONING SYSTEM
Wiring Diagram INFOID:0000000009757639
B

HAC

ABIWA0375GB

Revision: October 2013

HAC-41 2014 Sentra NAM
 AUTOMATIC AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [AUTOMATIC AIR CONDITIONER]

ABIWA0376GB

Revision: October 2013

HAC-42 2014 Sentra NAM
 AUTOMATIC AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [AUTOMATIC AIR CONDITIONER]

HAC

ABIIA1298GB

Revision: October 2013 HAC-43 2014 Sentra NAM

 AUTOMATIC AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [AUTOMATIC AIR CONDITIONER]

ABIIA1299GB

Revision: October 2013

HAC-44 2014 Sentra NAM
 AUTOMATIC AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [AUTOMATIC AIR CONDITIONER]

HAC

ABIIA1300GB

Revision: October 2013 HAC-45 2014 Sentra NAM

 AUTOMATIC AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [AUTOMATIC AIR CONDITIONER]

ABIIA1301GB

Revision: October 2013

HAC-46 2014 Sentra NAM
 AUTOMATIC AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [AUTOMATIC AIR CONDITIONER]

HAC

ABIIA1302GB

Revision: October 2013 HAC-47 2014 Sentra NAM

 AUTOMATIC AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [AUTOMATIC AIR CONDITIONER]

ABIIA1303GB

Revision: October 2013

HAC-48 2014 Sentra NAM
 AUTOMATIC AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [AUTOMATIC AIR CONDITIONER]

HAC

ABIIA1304GB

Revision: October 2013 HAC-49 2014 Sentra NAM

 AUTOMATIC AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [AUTOMATIC AIR CONDITIONER]

ABIIA1305GB

Revision: October 2013

HAC-50 2014 Sentra NAM
 DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]

BASIC INSPECTION A
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow INFOID:0000000009757640
B

OVERALL SEQUENCE
C

HAC

P
ALIIA0440GB

DETAILED FLOW
1. INTERVIEW CUSTOMER
Interview the customer to obtain as much information as possible about the conditions and environment under
which the malfunction occurred.

Revision: October 2013

HAC-51 2014 Sentra NAM
 DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]

>> GO TO 2.
2. SYMPTOM CHECK
Verify symptoms.

>> GO TO 3.
3. CHECK FOR
DTCS With
CONSULT
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.
Is any DTC detected?
YES >> GO TO 4.
NO >> GO TO 5.
4. PERFORM DTC DIAGNOSTIC PROCEDURE
Perform the diagnostic procedure for the detected DTC. Refer to HAC-37, "DTC Inspection Priority Chart".

>> GO TO 7.
5. OPERATION CHECK
Perform the operation check. Refer to HAC-53, "Work Procedure".

>> GO TO 6.
6. SYMPTOM DIAGNOSIS
Check the symptom diagnosis table. Refer to HAC-97, "Diagnosis Chart By Symptom".

>> GO TO 8.
7. VERIFY REPAIR.
With CONSULT
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.
Is any DTC detected?
YES >> GO TO 4.
NO >> GO TO 8.
8.PERFORM FINAL OPERATION CHECK
Perform the operation check. Refer to HAC-53, "Work Procedure".
Does it operate normally?
YES >> Inspection End.
NO >> GO TO 2.

Revision: October 2013

 DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]
HAC-52
2014
Sentra
NAM
 OPERATION INSPECTION
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]
OPERATION INSPECTION
A
Work Procedure INFOID:0000000009757641

DESCRIPTION B
The purpose of the operational check is to check that the individual system operates normally.

Conditions : Engine running at normal operating temperature C

INSPECTION PROCEDURE
1.CHECK MEMORY FUNCTION D
1. Start the engine.
2. Operate the temperature control switch (driver side) and raise the temperature setting to 32C (90F).
3. Press the OFF switch. E
4. Turn the ignition switch OFF.
5. Turn the ignition switch ON.
6. Press the AUTO switch.
7. Check that the temperature setting, before turning the ignition switch OFF, is stored. F
Is the inspection result
normal? YES >> GO
TO 2.
G
NO >> Check power and ground circuits for A/C auto amp. Refer to HAC-83, "A/C AUTO AMP. : Diagno-
sis Procedure".
2.CHECK BLOWER MOTOR SPEED H
1. Operate the fan control dial. Check that the fan speed changes.
2. Check the operation for all fan
speeds. Is the inspection result normal? HAC
YES >> GO TO 3.
NO >> Check blower motor system. Refer to HAC-90, "Diagnosis Procedure".
3. CHECK DISCHARGE AIR (MODE SWITCH AND DEF SWITCH) J
1. Press the MODE switch and the DEF switch.
2. Check that the air outlets change according to each indicated air outlet by placing a hand in front of the
outlets. Refer to HAC-12, "System Description". K
NOTE:
Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and intake door position is at
FRE ( ) when the D/F ( ) or DEF ( ) is selected. L
Is the inspection result normal?
YES >> GO TO 4.
NO >> Check mode door system. Refer to HAC-77, "Diagnosis Procedure". M
4.CHECK INTAKE AIR
1. Press the REC ( ) switch. Indicator is turned ON.
N
2. Press the FRE ( ) switch. Indicator is turned ON.
3. Listen for the intake door position change. (Slight change of blower sound can be heard.)
NOTE:
Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and the FRE ( ) switch is O
pressed when the D/F ( ) or DEF ( ) is
selected. Is the inspection result normal?
YES >> GO TO 5. P
NO >> Check intake door system. Refer to HAC-79, "Diagnosis Procedure".
5.CHECK A/C SWITCH
1. Press the A/C switch.
2. The A/C switch indicator is turned ON.
Confirm that the A/C compressor clutch engages (sound or visual inspection).
Is the inspection result normal?

Revision: October 2013

 OPERATION INSPECTION
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]
HAC-53
2014
Sentra
NAM
 OPERATION INSPECTION
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]
YES >> GO TO 6.
NO >> Check magnet clutch system. Refer to HAC-94, "Diagnosis Procedure".
6.CHECK TEMPERATURE DECREASE
1. Operate the A/C compressor.
2. Operate the temperature control switch (driver side) and lower the temperature setting to 18C (60F).
3. Check that the cool air blows from the
outlets. Is the inspection result normal?
YES >> GO TO 7.
NO >> Check for insufficient cooling. Refer to HAC-99, "Diagnosis Procedure".
7.CHECK TEMPERATURE INCREASE
1. Operate the temperature control switch (driver side) and raise the temperature setting to 32C (90F)
after warming up the engine.
2. Check that the warm air blows from the
outlets. Is the inspection result normal?
YES >> GO TO 8.
NO >> Check for insufficient heating. Refer to HAC-101, "Diagnosis Procedure".
8.CHECK DUAL MODE FUNCTION
1. Press the DUAL mode switch, and then check that “DUAL” is shown on the display.
2. Operate the temperature control switch (driver side). Check that the discharge air temperature (driver
side) changes.
3. Operate the temperature control switch (passenger side). Check that the discharge air temperature (pas-
senger side) changes.
4. Press the DUAL mode switch, and then check that the temperature setting (driver/passenger) is unified
to the driver side temperature setting.
Is the inspection result
normal? YES >> GO
TO 9.
NO >> Refer to HAC-97, "Diagnosis Chart By Symptom" and perform the appropriate diagnosis.
9.CHECK AUTO MODE
1. Press the AUTO switch, and then check that “AUTO” is shown on the display.
2. Operate the temperature control switch (driver side). Check that the fan speed, outlet air or intake air
changes. The discharge air temperature or fan speed varies depending on the ambient temperature, in-
vehicle temperature, and temperature setting.
Is the inspection result
normal? YES >>
Inspection End
NO >> Refer to HAC-97, "Diagnosis Chart By Symptom" and perform the appropriate diagnosis.
 OPERATION INSPECTION
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]

Revision: October 2013 HAC-54 2014 Sentra NAM

 SYSTEM SETTING
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]
SYSTEM SETTING
A
Temperature Setting Trimmer INFOID:0000000009757642

Description B
If the temperature felt by the customer is different than the airflow temperature controlled by the temperature
setting, the auto amplifier control temperature can be adjusted to compensate for the temperature setting.
How to set C
Using CONSULT, perform “TEMP SET CORRECT” in “WORK SUPPORT” of HVAC.

Work support items Display (F) Display (C) D

6 3.0
5 2.5
4 2.0 E
3 1.5
2 1.0
F
1 0.5
0 (initial status) 0 (initial status)
TEMP SET CORRECT
1 0.5
G
2 1.0
3 1.5
4 2.0 H
5 2.5
6 3.0
HAC
NOTE:
• When the temperature setting is set to 25.0C (77F) and 3.0C (6F), the temperature controlled by auto amp is 25.0C (77F) 
3.0C (6F) = 22.0C (71F) and the temperature becomes lower than the temperature setting. J
• When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of
the difference between the temperature setting and control temperature may be cancelled.
K
Inlet Port Memory Function (FRE) INFOID:0000000009757643

Description
• If the ignition switch is turned to the OFF position while the FRE ( ) switch is set to ON (fresh air intake), L
“Perform the memory” or “Do not perform the memory” of the FRE ( ) switch ON (fresh air intake) con-
dition can be selected.
• If “Perform the memory” was set, the FRE ( ) switch will be ON (fresh air intake) when turning the igni- M
tion switch to the ON position again.
• If “Do not perform the memory” was set, the air inlets will be controlled automatically when turning the igni-
tion switch to the ON position again. N
How to set
Using CONSULT, perform “FRE MEMORY SET” in “WORK SUPPORT” of HVAC.
O
Work support items Display Setting
WITHOUT Perform the memory of manual FRE
FRE MEMORY SET Do not perform the memory of manual FRE (auto P
WITH (initial status)
control)

NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of the
FRE switch memory function may be cancelled.

Revision: October 2013

HAC-55 2014 Sentra NAM
 SYSTEM SETTING
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]
Inlet Port Memory Function (REC) INFOID:0000000009757644

Description
• If the ignition switch is turned to the OFF position while the REC ( ) switch is set to ON (recirculation),
“Perform the memory” or “Do not perform the memory” of the REC ( ) switch ON (recirculation) condi-
tion can be selected.
• If “Perform the memory” was set, the REC ( ) switch will be ON (recirculation) when turning the ignition
switch to the ON position again.
• If “Do not perform the memory” was set, the air inlets will be controlled automatically when turning the igni-
tion switch to the ON position again.
How to set
Using CONSULT, perform “REC MEMORY SET” in “WORK SUPPORT” of HVAC.

Work support items Display Setting

WITHOUT (initial status) Perform the memory of manual REC
REC MEMORY SET Do not perform the memory of manual REC (auto
WITH
control)
NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of the
REC switch memory function may be cancelled.

Target Evaporator Temp Upper Limit INFOID:0000000009757645

DESCRIPTION
Set the target evaporator temperature upper limit.
HOW TO SET
With CONSULT
Perform the “TARGET EVAPORATOR TEMP UPPER LIMIT SETTING” of HVAC work support item.

Work support items Display

Initial Setting

TARGET EVAPORATOR TEMP UPPER LIMIT Low

SETTING Middle
High

Revision: October 2013

HAC-56 2014 Sentra NAM
 DOOR MOTOR STARTING POSITION RESET
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]
DOOR MOTOR STARTING POSITION RESET
A
Description INFOID:0000000009757646

• Reset signal is transmitted from A/C auto amp. to air mix door motor and mode door motor. Starting position B
reset can be performed.
NOTE:
During reset, DEF switch indicator blinks.
• When air mix door motor or mode door motor is removed and installed, always perform door motor starting C
position reset.

Work Procedure INFOID:0000000009757647

D
1.PERFORM DOOR MOTOR STARTING POSITION RESET
With CONSULT E
1. Turn ignition switch ON.
2. Select “Door Motor Starting Position Reset” in “ACTIVE TEST” mode of “HVAC” using CONSULT.
3. Touch “Start” and wait a few seconds.
4. Make sure the “COMPLETED” is displayed on CONSULT screen. F

>> Inspection End.

G

HAC

Revision: October 2013 HAC-57 2014 Sentra NAM

 U1000 CAN COMM CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description INFOID:0000000009757648

CAN (Controller Area Network) is a serial communication system for real time application. It is an on-vehicle
multiplex communication system with high data communication speed and excellent error detection ability.
Many electronic control units are equipped onto vehicles, and each control unit shares information and links
with other control units during operation (not independent). In CAN communication, control units are con-
nected with two communication lines (CAN-H line, CAN-L line) allowing a high rate of information
transmission with less wiring. Each control unit transmits/receives data but selectively reads required data
only. Refer to LAN-30, "CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart".
DTC Logic INFOID:0000000009757649

DTC DETECTION LOGIC

Items
DTC DTC detection condition Possible cause
(CONSULT screen terms)
When A/C auto amp. is not transmitting
U1000 CAN COMM CIRCUIT or receiving CAN communication CAN communication system
signal for 2 or more seconds.

DTC CONFIRMATION PROCEDURE

1.PERFORM SELF-DIAGNOSIS
With CONSULT
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis
results. Is DTC detected?
YES >> Refer to HAC-58, "Diagnosis
Procedure". NO >> Refer to GI-39, "Intermittent
Incident".
Diagnosis Procedure INFOID:0000000009757650

1.CHECK CAN COMMUNICATION SYSTEM

Check CAN communication system. Refer to LAN-16, "Trouble Diagnosis Flow Chart".

>> Inspection End.

Revision: October 2013

 U1000 CAN COMM CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-58
2014
Sentra
NAM
 U1010 CONTROL UNIT (CAN)
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
U1010 CONTROL UNIT (CAN)
A
Description INFOID:0000000009757651

Initial diagnosis of A/C auto amp. B

DTC Logic INFOID:0000000009757652

DTC DETECTION LOGIC C

Items
DTC DTC detection condition Possible cause D
(CONSULT screen terms)
When detecting error during the initial diag-
U1010 CONTROL UNIT (CAN) A/C auto amp.
nosis of CAN controller of A/C auto amp.
E
DTC CONFIRMATION PROCEDURE
1.PERFORM SELF-DIAGNOSIS
F
With CONSULT
1. Turn ignition switch ON.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis results. G
Is DTC detected?
YES >> Refer to HAC-59, "Diagnosis Procedure".
NO >> Inspection End. H

Diagnosis Procedure INFOID:0000000009757653

HAC
1.REPLACE A/C AUTO AMP.
Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".
J
>> Inspection End.

Revision: October 2013 HAC-59 2014 Sentra NAM

 B2578, B2579 IN-VEHICLE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
B2578, B2579 IN-VEHICLE SENSOR
DTC Logic INFOID:0000000009757654

DTC DETECTION LOGIC

NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
HAC- 58, "DTC Logic".
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
HAC- 59, "DTC Logic".

Items
DTC DTC detection condition Possible cause
(CONSULT screen terms)
The in-vehicle sensor recognition temperature • In-vehicle sensor
B2578
is too high. • A/C auto amp.
IN-VEHICLE SENSOR • Harness or connectors
The in-vehicle sensor recognition temperature (The sensor circuit is open or short-
B2579
is too low. ed.)

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Turn ignition switch ON.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis
results. Is DTC detected?
YES >> Refer to HAC-60, "Diagnosis
Procedure". NO >> Inspection End.
Diagnosis Procedure INFOID:0000000009757655

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.CHECK IN-VEHICLE SENSOR POWER SUPPLY

1. Turn ignition switch OFF.
2. Disconnect in-vehicle sensor connector.
3. Turn ignition switch ON.
4. Check voltage between in-vehicle sensor harness connector and ground.

+
In-vehicle sensor Voltage

(Approx.)
Connector Terminal
M69 1 Ground 5V

Is the inspection result

normal? YES >> GO
TO 2.
NO >> GO TO 4.
2.CHECK IN-VEHICLE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between front in-vehicle sensor harness connector and ground.

Revision: October 2013

 B2578, B2579 IN-VEHICLE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-60 2014
Sentra
NAM
 B2578, B2579 IN-VEHICLE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

In-vehicle sensor A
— Continuity
Connector Terminal
M69 2 Ground Yes
B
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector. C
3. CHECK IN-VEHICLE SENSOR
Check in-vehicle sensor. Refer to HAC-61, "Component Inspection".
D
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".
NO >> Replace in-vehicle sensor. Refer to HAC-107, "Removal and
Installation".
E
4. CHECK IN-VEHCILE SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector. F
3. Check continuity between in-vehicle sensor harness connector and A/C auto amp. harness connector.

In-vehicle sensor A/C auto amp. G

Continuity
Connector Terminal Connector Terminal
M69 1 M34 2 Yes
H
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair harness or connector.
HAC
5. CHECK IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT
Check continuity between in-vehicle sensor harness connector and ground.
J
In-vehicle sensor
— Continuity
Connector Terminal
M69 1 Ground No
K

Is the inspection result normal?

YES >> GO TO 6. L
NO >> Repair harness or connector.
6. CHECK IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT
M
1. Turn ignition switch ON.
2. Check voltage between in-vehicle sensor harness connector and ground.

+ N
In-vehicle sensor Voltage

(Approx.)
Connector Terminal
O
M69 1 Ground 0V

Is the inspection result normal?

YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation". P
NO >> Repair harness or connector.
Component Inspection INFOID:0000000009757656

1.CHECK IN-VEHICLE SENSOR

1. Turn ignition switch OFF.
2. Disconnect in-vehicle sensor connector.
Revision: October 2013
 B2578, B2579 IN-VEHICLE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-61 2014
Sentra
NAM
 B2578, B2579 IN-VEHICLE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
3. Check resistance between in-vehicle sensor terminals.

Condition
Terminal Resistance: k
Temperature: C (F)
15 (5) 12.73
10 (14) 9.92
5 (23) 7.80
0 (32) 6.19
5 (41) 4.95
10 (50) 3.99
15 (59) 3.24
1 2
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07
Is the inspection result
normal? YES >>
Inspection End.
NO >> Replace in-vehicle sensor. Refer to HAC-107, "Removal and Installation".

Revision: October 2013 HAC-62 2014 Sentra NAM

 B257B, B257C AMBIENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
B257B, B257C AMBIENT SENSOR
A
DTC Logic INFOID:0000000009757657

DTC DETECTION LOGIC B

NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to HAC-
58, "DTC Logic". C
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC-
59, "DTC Logic".
D Items
DTC DTC detection condition Possible cause
(CONSULT screen terms)
The ambient sensor recognition temperature is • Ambient sensor
B257B
too high. • A/C auto amp. E
AMBIENT SENSOR • Harness or connectors
The ambient sensor recognition temperature is (The sensor circuit is open or short-
B257C
too low. ed.)
F
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
G
With CONSULT
1. Turn ignition switch ON.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC. H
3. Check if any DTC No. is displayed in the self-diagnosis results.
Is DTC detected?
YES >> Refer to HAC-63, "Diagnosis HAC
Procedure". NO >> Inspection End.
Diagnosis Procedure INFOID:0000000009757658

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

K

1.CHECK AMBIENT SENSOR POWER SUPPLY

1. Turn ignition switch OFF. L
2. Disconnect ambient sensor connector.
3. Turn ignition switch ON.
4. Check voltage between ambient sensor harness connector and ground. M
+
Ambient sensor Voltage
 N
(Approx.)
Connector Terminal
E67 1 Ground 5V
O
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
P
2.CHECK AMBIENT SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between ambient sensor harness connector and ground.

Revision: October 2013

HAC-63 2014 Sentra NAM
 B257B, B257C AMBIENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

Ambient sensor
— Continuity
Connector Terminal
E67 2 Ground Yes
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3. CHECK AMBIENT SENSOR
Check ambient sensor. Refer to HAC-64, "Component Inspection".
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".
NO >> Replace ambient sensor. Refer to HAC-106, "Removal and Installation".
4.CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp.connector.
3. Check continuity between ambient sensor harness connector and A/C auto amp. harness connector.

Ambient sensor A/C auto amp.

Continuity
Connector Terminal Connector Terminal
E67 1 M34 4 Yes

Is the inspection result

normal? YES >> GO
TO 5.
NO >> Repair harness or connector.
5. CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT
Check continuity between ambient sensor harness connector and ground.

Ambient sensor
— Continuity
Connector Terminal
E67 1 Ground No

Is the inspection result

normal? YES >> GO
TO 6.
NO >> Repair harness or connector.
6. CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT
1. Turn ignition switch ON.
2. Check voltage between ambient sensor harness connector and ground.

+
Ambient sensor Voltage

(Approx.)
Connector Terminal
E67 1 Ground 0V
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and
Installation". NO >> Repair harness or connector.
Component Inspection INFOID:0000000009757659

1.CHECK AMBIENT SENSOR

1. Turn ignition switch OFF.
2. Disconnect ambient sensor connector.
 B257B, B257C AMBIENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
Revision: October 2013
HAC-64 2014 Sentra NAM
 B257B, B257C AMBIENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
3. Check resistance between ambient sensor terminals.
A
Condition
Terminal Resistance: k
Temperature: C (F)
15 (5) 12.73
B
10 (14) 9.92
5 (23) 7.80
C
0 (32) 6.19
5 (41) 4.95
10 (50) 3.99 D
15 (59) 3.24
1 2
20 (68) 2.65
25 (77) 2.19 E
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27 F
45 (113) 1.07

G
Is the inspection result normal?
YES >> Inspection End.
NO >> Replace ambient sensor. Refer to HAC-106, "Removal and Installation". H

HAC

Revision: October 2013 HAC-65 2014 Sentra NAM

 B2581, B2582 INTAKE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
B2581, B2582 INTAKE SENSOR
DTC Logic INFOID:0000000009757660

DTC DETECTION LOGIC

NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
HAC- 58, "DTC Logic".
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
HAC- 59, "DTC Logic".

Items
DTC DTC detection condition Possible cause
(CONSULT screen terms)
The intake sensor recognition temperature is • Intake sensor
B2581
too high. • A/C auto amp.
INTAKE SENSOR • Harness or connectors
The intake sensor recognition temperature is (The sensor circuit is open or short-
B2582
too low. ed.)

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Turn ignition switch ON.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis
results. Is DTC detected?
YES >> Refer to HAC-66, "Diagnosis
Procedure". NO >> Inspection End.
Diagnosis Procedure INFOID:0000000009757661

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.CHECK INTAKE SENSOR POWER SUPPLY

1. Turn ignition switch OFF.
2. Disconnect intake sensor connector.
3. Turn ignition switch ON.
4. Check voltage between intake sensor harness connector and ground.

+
Intake sensor Voltage

(Approx.)
Connector Terminal
M68 1 Ground 5V

Is the inspection result

normal? YES >> GO
TO 2.
NO >> GO TO 4.
2.CHECK INTAKE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between intake sensor harness connector and ground.

Revision: October 2013

 B2581, B2582 INTAKE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-66 2014
Sentra
NAM
 B2581, B2582 INTAKE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

Intake sensor A
— Continuity
Connector Terminal
M68 2 Ground Yes
B
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector. C
3. CHECK INTAKE SENSOR
Check intake sensor. Refer to HAC-67, "Component Inspection".
D
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and
Installation". NO >> Replace intake sensor. Refer to HAC-109, "Removal and
Installation".
E
4. CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector. F
3. Check continuity between intake sensor harness connector and A/C auto amp. harness connector.

Intake sensor A/C auto amp. G

Continuity
Connector Terminal Connector Terminal
M68 1 M34 3 Yes
H
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair harness or connector.
HAC
5. CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND
Check continuity between intake sensor harness connector and ground.
J
Intake sensor
— Continuity
Connector Terminal
M68 1 Ground No
K

Is the inspection result normal?

YES >> GO TO 6. L
NO >> Repair harness or connector.
6. CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO VOLTAGE
M
1. Turn ignition switch ON.
2. Check voltage between intake sensor harness connector and ground.

+ N
Intake sensor Voltage

(Approx.)
Connector Terminal
O
M68 1 Ground 0V

Is the inspection result normal?

YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation". P
NO >> Repair harness or connector.
Component Inspection INFOID:0000000009757662

1.CHECK INTAKE SENSOR

1. Turn ignition switch OFF.
2. Disconnect intake sensor connector.
Revision: October 2013
 B2581, B2582 INTAKE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-67 2014
Sentra
NAM
 B2581, B2582 INTAKE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
3. Check resistance between intake sensor terminals.

Condition
Terminal Resistance: k
Temperature: C (F)
15 (5) 17.73
10 (14) 13.46
5 (23) 10.33
0 (32) 8.00
5 (41) 6.25
10 (50) 4.93
15 (59) 3.92
1 2
20 (68) 3.14
25 (77) 2.54
30 (86) 2.06
35 (95) 1.69
40 (104) 1.39
45 (113) 1.15
Is the inspection result
normal? YES >>
Inspection End.
NO >> Replace intake sensor. Refer to HAC-109, "Removal and Installation".

Revision: October 2013 HAC-68 2014 Sentra NAM

 B2630, B2631 SUNLOAD SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
B2630, B2631 SUNLOAD SENSOR
A
DTC Logic INFOID:0000000009757663

DTC DETECTION LOGIC B

NOTE:
• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to HAC-
58, "DTC Logic" (U1000) or HAC-59, "DTC Logic" (U1010). C
• Sunload sensor may register a malfunction when indoors, at dusk, or at other times when light is insufficient.
When performing the diagnosis indoors, light the sunload sensor with a lamp (60W or more).
D
Items
DTC Diagnostic item is detected when... Possible cause
(CONSULT screen terms)
Detected calorie at sunload sensor 1677 w/m2 • Sunload sensor
B2630 SUNLOAD SEN (SHORT) E
2
(1442 kcal/m ·h) or more • A/C auto amp.
• Harness and connector
Detected calorie at sunload sensor 33 w/m2 (Sunload sensor circuit is open, or
B2631 SUNLOAD SEN (OPEN)
(28 kcal/m2·h) there is a short in the circuit) F
DTC CONFIRMATION PROCEDURE
1.CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT G
1. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
2. Check if any DTC No. is displayed in the self-diagnosis results.
NOTE: H
• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to
HAC- 58, "DTC Logic" (U1000) or HAC-59, "DTC Logic" (U1010).
• Sunload sensor may register a malfunction when indoors, at dusk, or at other times when light is HAC
insufficient. When performing the diagnosis indoors, light the sunload sensor with a lamp (60W or more).
Is DTC No.“B2630” or “B2631” displayed?
YES >> Perform trouble diagnosis for the sunload sensor. Refer to HAC-69, "Diagnosis Procedure". J
NO >> Inspection End.
Diagnosis Procedure INFOID:0000000009757664

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

L

1.CHECK SUNLOAD SENSOR POWER SUPPLY

1. Disconnect sunload sensor connector. M
2. Turn ignition switch ON.
3. Check voltage between sunload sensor harness connector and ground.
N
+
Sunload sensor Voltage

(Approx.)
Connector Terminal O
M70 1 Ground 5V

Is the inspection result normal? P

YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK CONTINUITY BETWEEN SUNLOAD SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between sunload sensor harness connector and A/C auto amp. harness connector.

Revision: October 2013

HAC-69 2014 Sentra NAM
 B2630, B2631 SUNLOAD SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

Sunload sensor A/C auto amp.

Continuity
Connector Terminal Connector Terminal
M70 2 M34 10 Yes
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK SUNLOAD SENSOR
1. Reconnect sunload sensor connector and A/C auto amp. connector.
2. Check sunload sensor. Refer to HAC-70, "Component
Inspection". Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".
NO >> Replace sunload sensor. Refer to HAC-108, "Removal and Installation".
4.CHECK CONTINUITY BETWEEN SUNLOAD SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between sunload sensor harness connector and A/C auto amp. harness connector.

Sunload sensor A/C auto amp.

Continuity
Connector Terminal Connector Terminal
M70 1 M34 5 Yes
4. Check continuity between sunload sensor harness connector and ground.

Sunload sensor
— Continuity
Connector Terminal
M70 1 Ground No
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and
Installation". NO >> Repair harness or connector.
Component Inspection INFOID:0000000009757665

1.CHECK SUNLOAD SENSOR

1. Turn ignition switch ON.
2. Check voltage between A/C auto amp. harness connector and ground.

(+) ()
A/C auto amp.
—
Connector Terminal
M34 5 Ground

Revision: October 2013 HAC-70 2014 Sentra NAM

 B2630, B2631 SUNLOAD SENSOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

AWIIA1189GB

NOTE: F
Select a place in direct sunlight when checking sunload sensor.
Is the inspection result normal?
YES >> Inspection End. G
NO >> Replace sunload sensor. Refer to HAC-108, "Removal and Installation".

HAC

Revision: October 2013 HAC-71 2014 Sentra NAM

 B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR (DRIVER
SIDE) DIAGNOSIS >
< DTC/CIRCUIT [AUTOMATIC AIR CONDITIONER]
B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR (DRIVER SIDE)
DTC Logic INFOID:0000000009757666

DTC DETECTION LOGIC

NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
HAC- 58, "DTC Logic".
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
HAC- 59, "DTC Logic".
• If air mix door motors DTC (B27A2 – B27A5) are detected, there is probably a disconnected connector or
an open circuit in air mix door motor drive power supply harness.

Items
DTC DTC detection condition Possible cause
(CONSULT screen terms)
Short or open circuit of air mix door motor drive
B27A2
signal terminal 1.
Short or open circuit of air mix door motor drive • Air mix door motor
B27A3 • A/C auto amp.
signal terminal 2.
DR AIR MIX DOOR MOT • Harness or connectors
Short or open circuit of air mix door motor drive
B27A4 (The motor circuit is open or short-
signal terminal 3.
ed.)
Short or open circuit of air mix door motor drive
B27A5
signal terminal 4.

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-74, "Diagnosis
Procedure". NO >> Inspection End.
Diagnosis Procedure INFOID:0000000009757667

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.CHECK AIR MIX DOOR MOTOR POWER SUPPLY

1. Turn ignition switch OFF.
2. Disconnect air mix door motor connector.
3. Turn ignition switch ON.
4. Check voltage between air mix door motor harness connector and ground.

+
Air mix door motor  Voltage
Connector Terminal
M128 5 Ground Battery voltage
Is the inspection result
normal? YES >> GO
TO 2.
NO >> Repair harness or connector between air mix door motor and fuse.
2.CHECK AIR MIX DOOR MOTOR LH DRIVE SIGNAL CIRCUIT FOR OPEN
Revision: October 2013
HAC-72 2014 Sentra NAM
 B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR (DRIVER
SIDE) DIAGNOSIS >
< DTC/CIRCUIT [AUTOMATIC AIR CONDITIONER]
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector. A
3. Check continuity between air mix door motor LH harness connector and A/C auto amp. harness connec-
tor.
B
Air mix door motor LH A/C auto amp.
Continuity
Connector Terminal Connector Terminal
1 34 C
2 33
M128 M34 Yes
3 32
4 31 D

Is the inspection result normal?

YES >> GO TO 3. E
NO >> Repair harness or connector.
3. CHECK AIR MIX DOOR MOTOR LH DRIVE SIGNAL CIRCUIT FOR SHORT
F
Check continuity between air mix door motor LH harness connector and A/C auto amp. harness connector.

Air mix door motor LH

— Continuity G
Connector Terminal
1
2 H
M128 Ground No
3
4
HAC
Is the inspection result
normal? YES >> GO
TO 4.
NO >> Repair harness or connector. J
4. CHECK AIR MIX DOOR MOTOR LH
Check air mix door motor LH. Refer to HAC-75, "Component Inspection".
K
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".
NO >> Replace air mix door motor LH. Refer to HAC-112, "AIR MIX DOOR MOTOR : Removal and
Installation - Air Mix Door Motor LH". L

Component Inspection INFOID:0000000009757668

M
1.CHECK AIR MIX DOOR MOTOR LH
1. Remove air mix door motor LH. Refer to HAC-112, "AIR MIX DOOR MOTOR : Removal and Installation -
Air Mix Door Motor LH". N
2. Check resistance between air mix door motor LH terminals. Refer to applicable table for the normal value.

Resistance () O
Terminal
(Approx.)
1
2 P
5 90
3
4

Is the inspection result

normal? YES >>
Inspection End.
NO >> Replace air mix door motor LH. Refer to HAC-112, "AIR MIX DOOR MOTOR : Removal and
Installation - Air Mix Door Motor LH".
 B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR (DRIVER
SIDE) DIAGNOSIS >
< DTC/CIRCUIT [AUTOMATIC AIR CONDITIONER]
Revision: October 2013
HAC-73 2014 Sentra NAM
 B27AA, B27AB, B27AC, B27AD AIR MIX DOOR MOTOR (PASSENGER
SIDE)
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
B27AA, B27AB, B27AC, B27AD AIR MIX DOOR MOTOR (PASSENGER
SIDE)
DTC Logic INFOID:0000000009757669

DTC DETECTION LOGIC

NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
HAC- 58, "DTC Logic".
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
HAC- 59, "DTC Logic".
• If air mix door motors DTC (B27A2 – B27A5) are detected, there is probably a disconnected connector or
an open circuit in air mix door motor drive power supply harness.

Items
DTC DTC detection condition Possible cause
(CONSULT screen terms)
Short or open circuit of air mix door motor drive
B27AA
signal terminal 1.
Short or open circuit of air mix door motor drive • Air mix door motor
B27AB • A/C auto amp.
signal terminal 2.
AS AIR MIX DOOR MOT • Harness or connectors
Short or open circuit of air mix door motor drive
B27AC (The motor circuit is open or short-
signal terminal 3.
ed.)
Short or open circuit of air mix door motor drive
B27AD
signal terminal 4.

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-74, "Diagnosis
Procedure". NO >> Inspection End.
Diagnosis Procedure INFOID:0000000009757670

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.CHECK AIR MIX DOOR MOTOR RH POWER SUPPLY

1. Turn ignition switch OFF.
2. Disconnect air mix door motor RH connector.
3. Turn ignition switch ON.
4. Check voltage between air mix door motor RH harness connector and ground.

+
Air mix door motor RH  Voltage
Connector Terminal
M127 5 Ground Battery voltage
Is the inspection result
normal? YES >> GO
TO 2.
NO >> Repair harness or connector.
HAC-74 2014 Sentra NAM
Revision: October 2013
 B27AA, B27AB, B27AC, B27AD AIR MIX DOOR MOTOR (PASSENGER
SIDE)
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
2.CHECK AIR MIX DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN
A
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between air mix door motor RH harness connector and A/C auto amp. harness connec-
B
tor.

Air mix door motor RH A/C auto amp.

Continuity C
Connector Terminal Connector Terminal
1 20
2 19 D
M127 M34 Yes
3 18
4 17
E
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
F
3. CHECK AIR MIX DOOR MOTOR RH DRIVE SIGNAL CIRCUIT FOR SHORT
Check continuity between air mix door motor RH harness connector and A/C auto amp. harness connector.
G
Air mix door motor RH
— Continuity
Connector Terminal
H
1
2
M127 Ground No
3 HAC
4

Is the inspection result normal?

YES >> GO TO 4. J
NO >> Repair harness or connector.
4. CHECK AIR MIX DOOR MOTOR RH K
Check air mix door motor RH. Refer to HAC-75, "Component Inspection".
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation". L
NO >> Replace air mix door motor RH. Refer to HAC-112, "AIR MIX DOOR MOTOR : Removal and
Installation - Air Mix Door Motor RH".
M
Component Inspection INFOID:0000000009757671

1.CHECK AIR MIX DOOR MOTOR RH

N
1. Remove air mix door motor RH. Refer to HAC-112, "AIR MIX DOOR MOTOR : Removal and Installation -
Air Mix Door Motor RH".
2. Check resistance between air mix door motor RH terminals. Refer to applicable table for the normal value.
O
Resistance ()
Terminal
(Approx.)
1 P
2
5 90
3
4
Revision:
Is the inspection result October
normal? YES >> 2013
Inspection End.
HAC-75
 B27AA, B27AB, B27AC, B27AD AIR MIX DOOR MOTOR (PASSENGER
SIDE)
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

2014 Sentra NAM

 B27AA, B27AB, B27AC, B27AD AIR MIX DOOR MOTOR (PASSENGER
SIDE)
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
NO >> Replace air mix door motor RH. Refer to HAC-112, "AIR MIX DOOR MOTOR : Removal and
Installation - Air Mix Door Motor RH".

Revision: October 2013 HAC-76 2014 Sentra NAM

 B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR
A
DTC Logic INFOID:0000000009757672

DTC DETECTION LOGIC B

NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to HAC-
58, "DTC Logic". C
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC-
59, "DTC Logic".
• If mode door motors DTC (B27A6 – B27A9) are detected, there is probably a disconnected connector or an open
circuit in mode door motor drive power supply harness. D

Items
DTC DTC detection condition Possible cause
(CONSULT screen terms) E
Short or open circuit of mode door motor drive
B27A6
signal terminal 1.
Short or open circuit of mode door motor drive • Mode door motor
B27A7 F
signal terminal 2. • A/C auto amp.
MODE DOOR MOTOR • Harness or connectors
Short or open circuit of mode door motor drive
B27A8 (The motor circuit is open or short-
signal terminal 3.
ed.) G
Short or open circuit of mode door motor drive
B27A9
signal terminal 4.

DTC CONFIRMATION PROCEDURE H

1.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT HAC
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC. J
Is DTC detected?
YES >> Refer to HAC-77, "Diagnosis Procedure".
NO >> Inspection End. K
Diagnosis Procedure INFOID:0000000009757673

L
Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

M
1.CHECK MODE DOOR MOTOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect mode door motor connector. N
3. Turn ignition switch ON.
4. Check voltage between mode door motor harness connector and ground.
O
+
Mode door motor  Voltage
Connector Terminal P
M126 5 Ground Battery voltage

Is the inspection result

normal? YES >> GO
TO 2.
NO >> Repair harness or connector between mode door motor and fuse.
2.CHECK MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN
Revision: October 2013
 B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-77 2014
Sentra
NAM
 B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between mode door motor harness connector and A/C auto amp. harness connector.

Mode door motor A/C auto amp.

Continuity
Connector Terminal Connector Terminal
4 37
3 38
M126 M34 Yes
2 39
1 40
Is the inspection result
normal? YES >> GO
TO 3.
NO >> Repair harness or connector.
3. CHECK MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT
Check continuity between mode door motor harness connector and A/C auto amp. harness connector.

Mode door motor

— Continuity
Connector Terminal
4
3
M126 Ground No
2
1
Is the inspection result
normal? YES >> GO
TO 4.
NO >> Repair harness or connector.
4. CHECK MODE DOOR MOTOR
Check mode door motor. Refer to HAC-78, "Component Inspection".
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".
NO >> Replace mode door motor. Refer to HAC-112, "MODE DOOR MOTOR : Removal and Installa-
tion".
Component Inspection INFOID:0000000009757674

1.CHECK MODE DOOR MOTOR

1. Remove mode door motor. Refer to HAC-112, "MODE DOOR MOTOR : Removal and Installation".
2. Check resistance between mode door motor terminals. Refer to applicable table for the normal value.

Resistance ()
Terminal
(Approx.)
1
2
5 90
3
4
Is the inspection result
normal? YES >>
Inspection End.
NO >> Replace mode door motor. Refer to HAC-112, "MODE DOOR MOTOR : Removal and Installa-
tion".
 B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
Revision: October 2013
HAC-78 2014 Sentra NAM
 B27A0, B27A1 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
B27A0, B27A1 INTAKE DOOR MOTOR
A
DTC Logic INFOID:0000000009757675

DTC DETECTION LOGIC B

NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to HAC-
58, "DTC Logic". C
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC-
59, "DTC Logic".

Items D
DTC
(CONSULT screen terms) DTC detection condition* Possible cause

PBR opening angle of intake door motor is • Intake door motor

B27A0 50% or more. (PBR feedback signal voltage of • Intake door motor system E
intake door motor is 2.5 V or more) installa- tion condition
INTAKE DOOR MOTOR • A/C auto amp.
PBR opening angle of intake door motor is • Harness or connectors
B27A1 30% or less. (PBR feedback signal voltage of (The motor circuit is open or short- F
intake door motor is 1.5 V or less) ed.)

*: A/C auto amp. operates intake door motor according to target value of PBR opening angle at 40% when per-
forming self-diagnosis. G
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE H
With CONSULT
1. Start engine.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT. HAC
3. Check DTC.
Is DTC
detected?
YES >> Refer to HAC-79, "Diagnosis Procedure". J
NO >> Inspection End.
Diagnosis Procedure INFOID:0000000009757676
K

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

L

1.CHECK INTAKE DOOR MOTOR OPERATION

M
1. Turn ignition switch ON.
2. Operate intake switch and check by operation sound that intake door motor operates.
Does the intake door motor operate?
N
YES >> GO TO 2.
NO >> GO TO 8.
2.CHECK INTAKE DOOR MOTOR PBR POWER SUPPLY O
1. Disconnect intake door motor connector.
2. Turn ignition switch ON.
3. Check voltage between intake door motor harness connector and ground. P

+
Intake door motor Voltage

(Approx.)
Connector Terminal
M58 1 Ground 5V
Is the inspection result normal? HAC-79
Revision: October 2013
 B27A0, B27A1 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

2014 Sentra NAM

 B27A0, B27A1 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
YES >> GO TO 3.
NO >> GO TO 7.
3.CHECK INTAKE DOOR MOTOR PBR GROUND CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

Intake door motor A/C auto amp.

Continuity
Connector Terminal Connector Terminal
M58 3 M34 10 Yes

Is the inspection result

normal? YES >> GO
TO 4.
NO >> Repair harness or connector.
4. CHECK INTAKE DOOR MOTOR PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN
Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

Intake door motor A/C auto amp.

Continuity
Connector Terminal Connector Terminal
M58 2 M34 22 Yes
Is the inspection result
normal? YES >> GO
TO 5.
NO >> Repair harness or connector.
5. CHECK INTAKE DOOR MOTOR PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT
Check continuity between intake door motor harness connector and ground.

Intake door motor

— Continuity
Connector Terminal
M58 2 Ground No

Is the inspection result

normal? YES >> GO
TO 6.
NO >> Repair harness or connector.
6. CHECK INTAKE DOOR MOTOR PBR
Check intake door motor PBR. Refer to HAC-81, "Component Inspection (PBR)".
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".
NO >> Replace intake door motor. Refer to HAC-112, "INTAKE DOOR MOTOR : Removal and Installa-
tion".
7. CHECK INTAKE DOOR MOTOR PBR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

Intake door motor A/C auto amp.

Continuity
Connector Terminal Connector Terminal
M58 1 M34 8 Yes
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and
Installation". NO >> Repair harness or connector.
 B27A0, B27A1 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

Revision: October 2013

HAC-80 2014 Sentra NAM
 B27A0, B27A1 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
8.CHECK INTAKE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN
A
1. Turn ignition switch OFF.
2. Disconnect intake door motor connector, and A/C auto amp. connector.
3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.
B
Intake door motor A/C auto amp.
Continuity
Connector Terminal Connector Terminal C
5 35
M58 M34 Yes
6 36
D
Is the inspection result normal?
YES >> GO TO 9.
NO >> Repair harness or connector.
E
9. CHECK INTAKE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT
Check continuity between intake door motor harness connector and ground.
F
Intake door motor
— Continuity
Connector Terminal
5 G
M58 Ground No
6

Is the inspection result normal? H

YES >> GO TO 10.
NO >> Repair harness or connector.
10. CHECK INTAKE DOOR MOTOR HAC
1. Turn ignition switch OFF.
2. Check intake door motor. Refer to HAC-82, "Component Inspection (Motor)".
J
Is the inspection result normal?
YES >> GO TO 11.
NO >> Replace intake door motor. Refer to HAC-112, "INTAKE DOOR MOTOR : Removal and Installa-
tion". K

11.CHECK INSTALLATION OF INTAKE DOOR MOTOR SYSTEM

Check intake door motor system is properly installed. Refer to HAC-111, "Exploded View". L
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".
NO >> Repair or replace malfunctioning parts. M
Component Inspection (PBR) INFOID:0000000009757677

1.CHECK INTAKE DOOR MOTOR PBR N

Check resistance between intake door motor terminals.

O
Terminal Resistance ()
2
1 Except 0 or 
3 P
Is the inspection result
normal? YES >>
Inspection End.
NO >> Replace intake door motor. Refer to HAC-112, "INTAKE DOOR MOTOR : Removal and Installa-
tion".
 B27A0, B27A1 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
Revision: October 2013
HAC-81 2014 Sentra NAM
 B27A0, B27A1 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
Component Inspection (Motor) INFOID:0000000009757678

1.CHECK INTAKE DOOR MOTOR

Supply intake door motor terminals with battery voltage and check by visually and operation sound that intake
door motor operates.

Terminal
Operation direction
+ 
5 6 FRE
6 5 REC

Is the inspection result

normal? YES >>
Inspection End.
NO >> Replace intake door motor. Refer to HAC-112, "INTAKE DOOR MOTOR : Removal and Installa-
tion".

Revision: 2013
October
 B27A0, B27A1 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-82
2014
Sentra
NAM
 POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
POWER SUPPLY AND GROUND CIRCUIT
A
A/C AUTO AMP.
A/C AUTO AMP. : Diagnosis Procedure INFOID:0000000009757679

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

C

1. CHECK FUSE
D
Check fuses [No. 5, 8 and 21, located in the fuse block (J/B)].
NOTE:
Refer to PG-47, "Terminal Arrangement".
Is the inspection result normal? E
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit.
2. CHECK A/C AUTO AMP. POWER SUPPLY F

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.
G
3. Check voltage between A/C auto amp. harness connector and ground.

+ Voltage
H
A/C auto amp.  Ignition switch position
Connector Terminal OFF ACC ON
11 Approx. 0 V Approx. 0 V Battery voltage HAC
M34 12 Ground Battery voltage Battery voltage Battery voltage
21 Approx. 0 V Battery voltage Battery voltage
J
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector between A/C auto amp. and fuse block (J/B). K
3. CHECK A/C AUTO AMP. GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between A/C auto amp. harness connector and ground. L

A/C auto amp.

M — Continuity
Connector Terminal
M34 30 Ground Yes

Is the inspection result normal? N

YES >> Inspection End.
NO >> Repair harness or connector.
A/C SWITCH ASSEMBLY O

A/C SWITCH ASSEMBLY : Component Function Check INFOID:0000000009757680

1.CHECK OPERATION P

1. Press the AUTO switch, and then check that “AUTO” is shown on the display.
2. Operate the temperature control switch (driver side). Check that the fan speed or outlet changes. (The
discharge air temperature or fan speed varies depending on the ambient temperature, in-vehicle
tempera- ture, and temperature setting.)
Does it operate normally?
YES >> Inspection End.
Revision: October 2013
HAC-83 2014 Sentra NAM
 POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
NO >> Perform trouble diagnosis for the A/C switch assembly. Refer to HAC-84, "A/C SWITCH
ASSEM- BLY : Diagnosis Procedure".
A/C SWITCH ASSEMBLY : Diagnosis Procedure INFOID:0000000009757681

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.CHECK A/C SWITCH ASSEMBLY POWER SUPPLY

1. Disconnect the A/C switch assembly connector.
2. Turn ignition switch ON.
3. Check voltage between A/C switch assembly harness connector and ground.

(+)
A/C switch assembly Voltage
()
(Approx.)
Connector Terminal
M59 4 Ground Battery voltage

Is the inspection result

normal? YES >> GO
TO 3.
NO >> GO TO 2.
2.CHECK FUSE
Check 10A fuse [No.5, located in the fuse block (J/B)].
NOTE:
Refer to PG-47, "Terminal Arrangement".
Is the inspection result normal?
YES >> Check harness for open circuit. Repair or replace if necessary.
NO >> Check harness for short circuit. Repair or replace if necessary.
3.CHECK A/C SWITCH ASSEMBLY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between A/C switch assembly harness connector and ground.

A/C switch assembly

— Continuity
Connector Terminal
M59 1 Ground Yes
Is the inspection result normal?
YES >> Replace the A/C switch assembly. Refer to HAC-104, "Removal and
Installation". NO >> Repair the harnesses or connectors.

Revision: October 2013

 POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-84 2014
Sentra
NAM
 A/C SWITCH ASSEMBLY SIGNAL CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
A/C SWITCH ASSEMBLY SIGNAL CIRCUIT
A
Diagnosis Procedure INFOID:0000000009757682

B
Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

C
1.CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT
1. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
2. Check if any DTC No. is displayed in the self-diagnosis results. D
NOTE:
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to HAC-
58, "DTC Logic" (U1000) or HAC-59, "DTC Logic" (U1010).
Is any DTC No. displayed? E
YES >> Perform diagnosis for the applicable DTC. Refer to HAC-38, "DTC
Index". NO >> GO TO 2. F
2.CHECK RX (A/C SWITCH ASSEMBLY  A/C AUTO AMP.) CIRCUIT CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect the A/C switch assembly and the A/C auto amp. connectors. G
3. Check continuity between A/C switch assembly harness connector and A/C auto amp. harness connector.

A/C switch assembly A/C auto amp. H

Continuity
Connector Terminal Connector Terminal
M59 8 M34 27 Yes
HAC
4. Check continuity between A/C switch assembly harness connector M79 terminal 10 and ground.

A/C switch assembly J

— Continuity
Connector Terminal
M59 8 Ground No
K
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
L
3.CHECK TX (A/C AUTO AMP.  A/C SWITCH ASSEMBLY) CIRCUIT CONTINUITY
1. Check continuity between A/C switch assembly harness connector and A/C auto amp. harness connector.
M
A/C switch assembly A/C auto amp.
Continuity
Connector Terminal Connector Terminal
M59 9 M34 28 Yes N

2. Check continuity between A/C switch assembly harness connector M79 terminal 9 and ground.
O
A/C switch assembly
— Continuity
Connector Terminal
M59 9 Ground No P
Is the inspection result normal?
YES >> Perform trouble diagnosis for the A/C switch assembly. Refer to HAC-84, "A/C SWITCH
ASSEM- BLY : Diagnosis Procedure".
NO >> Repair harness or connector.

Revision: October 2013

HAC-85 2014 Sentra NAM
 A/C ON SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
A/C ON SIGNAL
Component Function Check INFOID:0000000009757683

1.CHECK A/C ON SIGNAL

With CONSULT
1. Turn ignition switch ON.
2. Operate blower motor.
3. Select “AIR CONDITIONER” of “BCM” using CONSULT.
4. Select “AIR COND SW” in “DATA MONITOR” mode.
5. Check A/C ON signal when the A/C switch is operated.

Monitor item Condition Status

ON (A/C indicator:
On
ON)
AIR COND SW A/C switch
OFF (A/C indicator:
Off
OFF)
Is the inspection result
normal? YES >>
Inspection End.
NO >> Refer to HAC-86, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000009757684

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.CHECK A/C ON SIGNAL

1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Turn ignition switch ON.
4. Check output waveform between A/C auto amp. harness connector and ground with using oscilloscope.

+
A/C auto amp.  Output waveform
Connector Terminal

M34 15 Ground

JPMIA0012GB

Is the inspection result normal?

YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and
Installation". NO >> GO TO 2.
2.CHECK A/C ON SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between A/C auto amp. harness connector and BCM harness connector.

Revision: October 2013

 A/C ON SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-86 2014
Sentra
NAM
 A/C ON SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

A/C auto amp. BCM A

Continuity
Connector Terminal Connector Terminal
M34 15 M84 27 Yes
B
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector. C
3.CHECK A/C ON SIGNAL CIRCUIT FOR SHORT
Check continuity between A/C auto amp. harness connector and ground.
D
A/C auto amp.
— Continuity
Connector Terminal
E
M34 15 Ground No

Is the inspection result normal?

YES >> Replace BCM. Refer to BCS-73, "Removal and Installation". F
NO >> Repair harness or connector.

HAC

Revision: October 2013 HAC-87 2014 Sentra NAM

 BLOWER FAN ON SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
BLOWER FAN ON SIGNAL
Component Function Check INFOID:0000000009757685

1.CHECK BLOWER FAN ON SIGNAL

With CONSULT
1. Turn ignition switch ON.
2. Select “AIR CONDITIONER” of “BCM” using CONSULT.
3. Select “FAN ON SIG” in “DATA MONITOR” mode.
4. Check blower fan ON signal when the fan control dial is operated.

Monitor item Condition Status

ON On
FAN ON SIG Blower motor
OFF OFF
Is the inspection result
normal? YES >>
Inspection End.
NO >> Refer to HAC-88, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000009757686

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.CHECK BLOWER FAN ON SIGNAL

1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. harness connector.
3. Turn ignition switch ON.
4. Check output waveform between A/C auto amp. and ground with using oscilloscope.

+
A/C auto amp.  Output waveform
Connector Terminal

M34 14 Ground

PKIB4960J

Is the inspection result normal?

YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and
Installation". NO >> GO TO 2.
2.CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity A/C auto amp. harness connector and BCM harness connector.

A/C auto amp. BCM

Continuity
Connector Terminal Connector Terminal
M34 14 M84 28 Yes
Is the inspection result normal?

Revision: October 2013 HAC-88 2014 Sentra NAM

 BLOWER FAN ON SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
YES >> GO TO 3.
NO >> Repair harness or connector. A
3.CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR SHORT
Check continuity between A/C auto amp. harness connector and ground.
B

A/C auto amp.

— Continuity
Connector Terminal C
M34 14 Ground No

Is the inspection result normal?

D
YES >> Replace BCM. Refer to BCS-73, "Removal and Installation".
NO >> Repair harness or connector.

HAC

Revision: October 2013 HAC-89 2014 Sentra NAM

 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR
Diagnosis Procedure INFOID:0000000009757687

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check following fuses.
- 10A fuse [No. 21, located in fuse block (J/B)]
- 15A fuses [Nos. 20 and 22, located in fuse block (J/B)]
NOTE:
Refer to PG-47, "Terminal Arrangement".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit.
2.CHECK BLOWER MOTOR POWER SUPPLY
1. Disconnect blower motor connector.
2. Turn ignition switch ON.
3. Check voltage between blower motor harness connector and ground.

+
Blower motor  Voltage
Connector Terminal
M62 1 Ground Battery voltage
Is the inspection result
normal? YES >> GO
TO 4.
NO >> GO TO 3.
3.CHECK BLOWER RELAY
1. Turn ignition switch OFF.
2. Check blower relay. Refer to HAC-93, "Component Inspection (Blower Motor
Relay)". Is the inspection result normal?
YES >> Repair harness or connector between blower motor and
fuse. NO >> Replace blower relay.
4.CHECK BLOWER MOTOR CONTROL CIRCUIT
1. Turn ignition switch OFF.
2. Connect blower motor connector.
3. Disconnect variable blower control connector.
4. Turn ignition switch ON.
5. Check voltage between variable blower control harness connector and ground.

+
Variable blower control  Voltage
Connector Terminal
M52 1 Ground Battery voltage
Is the inspection result
normal? YES >> GO
TO 6.
NO >> GO TO 5.
5.CHECK BLOWER MOTOR CONTROL CIRCUIT FOR OPEN
Revision: October 2013
 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-90
2014
Sentra
NAM
 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
1. Turn ignition switch OFF.
2. Disconnect blower motor connector. A
3. Check continuity between variable blower control harness connector and blower motor harness connec-
tor.
B
Variable blower control Blower motor
Continuity
Connector Terminal Connector Terminal
M52 1 M62 2 Existed C
Is the inspection result normal?
YES >> Replace blower motor. Refer to VTL-10, "Removal and Installation".
D
NO >> Repair harness or connector.
6.CHECK A/C AUTO AMP. IGNITION POWER SUPPLY
1. Turn ignition switch OFF. E
2. Disconnect A/C auto amp.
3. Turn ignition switch ON.
4. Check voltage between A/C auto amp. harness connector and ground.
F
+
A/C auto amp.  Voltage G
Connector Terminal
M34 21 Ground Battery voltage
H
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair harness or connector between A/C auto amp. and fuse.
HAC
7. CHECK VARIABLE BLOWER CONTROL IGNITION POWER SUPPLY
Check voltage between variable blower control harness connector and ground.
J
+
Variable blower control  Voltage
Connector Terminal
K
M52 4 Ground Battery voltage

Is the inspection result normal? L

YES >> GO TO 8.
NO >> Repair harness or connector between variable blower control and fuse.
8. CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT FOR OPEN M
1. Turn ignition switch OFF.
2. Check continuity between variable blower control harness connector and ground.
N
Variable blower control
— Continuity
Connector Terminal
O
M52 3 Ground Yes

Is the inspection result normal?

YES >> GO TO 9. P
NO >> Repair harness or connector.
9.CHECK VARIABLE BLOWER CONTROL CONTROL SIGNAL
1. Connect variable blower control connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Set air outlet to VENT.

Revision: October 2013 HAC-91 2014 Sentra NAM

 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
4. Change fan speed from 1st – 7th, and check duty ratios between variable blower control harness
connec- tor and ground by using an oscilloscope.
NOTE:
Calculate the drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms

+
 Condition
Variable blower control Duty ratio
Output waveform
Fan speed (manual) (Approx.)
Connector Terminal
Air outlet: VENT
1st 26%
2nd 34%
3rd 41%

M52 2 Ground 4th 51%

5th 62%
6th 73%
7th 82% JPIIA1646GB

Is the inspection result normal?

YES >> Replace variable blower control. Refer to HAC-113, "Removal and
Installation". NO >> GO TO 10.
10.CHECK VARIABLE BLOWER CONTROL CONTROL SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect variable blower control connector and A/C auto amp. connector.
3. Check continuity between variable blower control harness connector and A/C auto amp. harness
connec- tor.

Variable blower control A/C auto amp.

Continuity
Connector Terminal Connector Terminal
M52 2 M34 13 Yes

Is the inspection result

normal? YES >> GO
TO 11.
NO >> Repair harness or connector.
11.CHECK VARIABLE BLOWER CONTROL CONTROL SIGNAL CIRCUIT FOR SHORT
Check continuity between variable blower control harness connector and ground.

Variable blower control

— Continuity
Connector Terminal
M52 2 Ground No
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and
Installation". NO >> Repair harness or connector.
Component Inspection (Blower Motor) INFOID:0000000009757688

1.CHECK BLOWER MOTOR

1. Connect battery voltage to terminal 1 of blower motor.
2. Connect ground to terminal 2 of blower
motor. Does the blower fan operate?
YES >> Intermittent incident. Refer to GI-39, "Intermittent Incident".
NO >> Replace blower motor. Refer to VTL-10, "Removal and Installation".

Revision: October 2013

HAC-92 2014 Sentra NAM
 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
Component Inspection (Blower Motor Relay) INFOID:0000000009757689
A
1.CHECK BLOWER RELAY
1. Turn ignition switch OFF.
2. Remove blower motor relay. B
3. Check continuity between blower motor relay terminals 3 and 5
when voltage is supplied between terminals 1 and 2.
C
Terminals Voltage Continuity
ON Yes
3 5 D
OFF No

Is the inspection result normal?

YES >> Inspection End. E
NO >> Replace blower motor relay.
JSIIA1551ZZ

HAC

Revision: October 2013 HAC-93 2014 Sentra NAM

 MAGNET CLUTCH
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH
Component Function Check INFOID:0000000009757690

1.CHECK MAGNET CLUTCH OPERATION

Perform auto active test of IPDM E/R. Refer to PCS-9, "Diagnosis Description".
Does it operate normally?
YES >> Inspection End.
NO >> Refer to HAC-94, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000009757691

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 10A fuse (No. 39, located in IPDM E/R).
NOTE:
Refer to PG-49, "IPDM E/R Terminal Arrangement".
Is the inspection result
normal? YES >> GO
TO 2.
NO >> Replace the blown fuse after repairing the affected circuit.
2.CHECK MAGNET CLUTCH POWER SUPPLY CIRCUIT
1. Disconnect compressor connector and IPDM E/R connector.
2. Check continuity between compressor harness connector and IPDM E/R harness connector.

Compressor IPDM E/R

Continuity
Connector Terminal Connector Terminal
F3 1 E43 12 Yes
Is the inspection result
normal? YES >> GO
TO 3.
NO >> Repair harness or connector.
3. CHECK MAGNET CLUTCH GROUND CIRCUIT
1. Disconnect compressor connector.
2. Check continuity between compressor harness connector and ground.

Compressor
Continuity
Connector Terminal
F3 2 Ground Yes
Is the inspection result
normal? YES >> GO
TO 4.
NO >> Repair harness or connector.
4.CHECK MAGNET CLUTCH
Directly apply battery voltage to the magnet clutch. Check operation visually and by sound.
Does it operate normally?
YES >> Replace IPDM E/R. Refer to PCS-30, "Removal and Installation".
NO >> Replace magnet clutch. Refer to HA-31, "MAGNET CLUTCH : Removal and Installation".
 MAGNET CLUTCH
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

Revision: October 2013 HAC-94 2014 Sentra NAM

 ECV (ELECTRICAL CONTROL VALVE)
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
ECV (ELECTRICAL CONTROL VALVE)
A
Diagnosis Procedure INFOID:0000000009757692

B
Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

C
1.CHECK ECV (ELECTRICAL CONTROL VALVE) POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect compressor connector. D
3. Turn ignition switch ON.
4. Check voltage between compressor harness connector and ground.
E
+
Compressor  Voltage
Connector Terminal F
F10 3 Ground Battery voltage

Is the inspection result normal?

YES >> GO TO 3. G
NO >> GO TO 2.
2.CHECK FUSE H
1. Turn ignition switch OFF.
2. Check 10 A fuse [No. 5, located in fuse block (J/B)]. Refer to PG-47, "Terminal
Arrangement" Is the inspection result normal? HAC
YES >> Repair harness or connector.
NO >> Replace the blown fuse after repairing the affected circuit.
3. CHECK ECV CONTROL SIGNAL CIRCUIT FOR OPEN J

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.
K
3. Check continuity between compressor harness connector and A/C auto amp. harness connector.

Compressor A/C auto amp.

Continuity L
Connector Terminal Connector Terminal
F10 4 M34 1 Yes

Is the inspection result normal? M

YES >> GO TO 4.
NO >> Repair harness or connector.
4. CHECK ECV CONTROL SIGNAL CIRCUIT FOR SHORT N

Check continuity between compressor harness connector and ground.

O
Compressor
— Continuity
Connector Terminal
F10 4 Ground No P
Is the inspection result
normal? YES >> GO
TO 5.
NO >> Repair harness or connector.
5. CHECK ECV
Check ECV. Refer to HAC-96, "Component Inspection".

Revision: October 2013

 ECV (ELECTRICAL CONTROL VALVE)
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
HAC-95 2014
Sentra
NAM
 ECV (ELECTRICAL CONTROL VALVE)
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
Is the inspection result
normal? YES >> GO
TO 6.
NO >> Replace compressor. Refer to HA-31, "COMPRESSOR : Removal and Installation".
6. CHECK INTERMITTENT INCIDENT
Refer to GI-39, "Intermittent Incident".
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and
Installation". NO >> Repair or replace malfunctioning parts.
Component Inspection INFOID:0000000009757693

1.CHECK ECV (ELECTRICAL CONTROL VALVE)

1. Turn ignition switch OFF.
2. Disconnect compressor connector.
3. Check continuity between compressor connector F10 terminals.

Condition
Terminals Resistance (k)
Temperature: C (F)
3 4 20 (68) 10.1 – 11.1

Is the inspection result

normal? YES >>
Inspection End.
NO >> Replace compressor. Refer to HA-31, "COMPRESSOR : Removal and Installation".
 ECV (ELECTRICAL CONTROL VALVE)
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

Revision: October 2013 HAC-96 2014 Sentra NAM

 HEATER AND AIR CONDITIONING SYSTEM CONTROL
SYMPTOMS
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

SYMPTOM DIAGNOSIS A
HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS
Diagnosis Chart By Symptom INFOID:0000000009757694
B
NOTE:
Perform the self-diagnoses with CONSULT before performing the symptom diagnosis. If DTC is detected, per- form
the corresponding diagnosis. C

Symptom Corresponding malfunction part Reference

• Air conditioning does not activate. D
• A/C auto amp. ignition power
• Air conditioning cannot be controlled. HAC-83, "A/C AUTO AMP. : Diag-
supply circuit
• Operation status of air conditioning is not nosis Procedure"
• Front A/C control (A/C auto amp.)
indicated on display.
E
• Circuit between mode door
motor and A/C auto amp.
• Air outlet does not change.
• Mode door motor control linkage HAC-77, "Diagnosis Procedure"
• Mode door motor does not operate normally.
• Mode door motor F
• A/C auto amp.
• Circuit between air mix door
motor LH and A/C auto amp.
• Discharge air temperature of driver side does G
• Air mix door motor LH
not change. HAC-72, "Diagnosis Procedure"
installation condition
• Air mix door motor LH does not operate normally.
• Air mix door motor LH
• A/C auto amp. H
• Circuit between air mix door
motor RH and A/C auto amp.
• Discharge air temperature of passenger side
• Air mix door motor RH
does not change. HAC-74, "Diagnosis Procedure" HAC
installation condition
• Air mix door motor RH does not operate normally.
• Air mix door motor RH
• A/C auto amp.
• Circuit between intake door J
motor and A/C auto amp.
• Intake door does not change.
• Intake door motor control linkage HAC-79, "Diagnosis Procedure"
• Intake door motor does not operate normally.
• Intake door motor
• A/C auto amp. K
• Power supply system of front
blower motor
• Circuit between front blower L
Blower motor operation is malfunctioning. HAC-90, "Diagnosis Procedure"
motor and A/C auto amp.
• Front blower motor
• A/C auto amp.
M
• Circuit between magnet clutch
and IPDM E/R
• Magnet clutch
• IPDM E/R (A/C relay) N
Compressor does not operate. • Circuit between ECM and HAC-94, "Diagnosis Procedure"
refriger- ant pressure sensor
• Refrigerant pressure sensor
• CAN communication circuit O
• A/C auto amp.
• Magnet clutch control system
• Drive belt slipping P
• Refrigerant cycle
• Insufficient cooling. • ECV (electrical control valve)
HAC-99, "Diagnosis Procedure"
• No cool air comes out. (Air flow volume is • Air leakage from each duct
normal.) • A/C auto amp. connection
recogni- tion signal circuit
• Temperature setting trimmer (front)

Revision: October 2013 HAC-97 2014 Sentra NAM

 HEATER AND AIR CONDITIONING SYSTEM CONTROL
SYMPTOMS
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
Symptom Corresponding malfunction part Reference
• Engine cooling system
• Insufficient heating. • Heater hose
• No warm air comes out. (Air flow volume is • Heater core HAC-101, "Diagnosis Procedure"
nor- mal.) • Air leakage from each duct
• Temperature setting trimmer (front)
During compressor
Refrigerant cycle HA-17, "Symptom Table"
operation
Noise is heard when front • Mixing any foreign object in
air conditioning system op- front blower motor
erates. During front blower HAC-92, "Component Inspection
• Front blower motor fan breakage
motor operation (Blower Motor)"
• Front blower motor rotation
inferiori- ty
• Battery power supply system of
• Memory function does not operate. HAC-83, "A/C AUTO AMP. : Diag-
A/C auto amp.
• Setting temperature is not memorized. nosis Procedure"
• A/C auto amp.

Revision: October 2013 HAC-98 2014 Sentra NAM

 INSUFFICIENT COOLING
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
INSUFFICIENT COOLING
A
Description INFOID:0000000009757695

B
Symptom
• Insufficient cooling
• No cool air comes out. (Air flow volume is normal.)
C
Diagnosis Procedure INFOID:0000000009757696

NOTE:
Perform self-diagnoses with CONSULT before performing symptom diagnosis. If any DTC is detected, per- D
form the corresponding diagnosis.
1.CHECK MAGNET CLUTCH OPERATION E
1. Turn ignition switch ON.
2. Operate fan switch.
3. Press A/C switch.
4. Check that A/C indicator turns ON. Check visually and by sound that compressor operates. F
5. Press A/C switch again.
6. Check that A/C indicator turns OFF. Check that compressor stops.
Is the inspection result normal? G
YES >> GO TO 2.
NO >> Perform diagnosis of “COMPRESSOR DOES NOT OPERATE” in “SYMPTOM DIAGNOSIS”.
Refer to HAC-102, "Diagnosis Procedure". H
2. CHECK DRIVE BELT
Check tension of drive belt. Refer to EM-16, "Inspection".
HAC
Is the inspection result normal?
YES >> GO TO 3.
NO >> Adjust or replace drive belt depending on the inspection results.
J
3. CHECK REFRIGERANT CYCLE
Connect recovery/recycling recharging equipment to the vehicle and perform pressure inspection with gauge.
Refer to HA-18, "Symptom Table". K
Is the inspection result
normal? YES >> GO
TO 4.
NO >> Repair or replace parts depending on the inspection results. L
4. CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of the front air conditioning system for leakage.
M
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace parts depending on the inspection results. N
5. CHECK AMBIENT TEMPERATURE DISPLAY
Check that there is not much difference between actual ambient temperature and indicated temperature on
information display in combination meter. O
Is the inspection result
normal? YES >> GO
TO 6.
NO >> Perform diagnosis for the A/C auto amp. connection recognition signal circuit. Refer to HAC-63, P
"Diagnosis Procedure".
6. CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)
1. Check setting value of temperature setting trimmer (front). Refer to HAC-55, "Temperature Setting Trim-
mer".
2. Check that temperature setting trimmer (front) is set to “+ direction”.
NOTE:
 INSUFFICIENT COOLING
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
Revision: October 2013
HAC-99 2014 Sentra NAM
 INSUFFICIENT COOLING
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
The control temperature can be set with the setting of the temperature setting trimmer (front).
3. Set difference between set temperature and control temperature to
“0”. Is inspection result normal?
YES >> Inspection End.
NO >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".

Revision: October 2013

HAC-100 2014 Sentra NAM
 INSUFFICIENT HEATING
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
INSUFFICIENT HEATING
A
Description INFOID:0000000009757697

B
Symptom
• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)
C
Diagnosis Procedure INFOID:0000000009757698

NOTE:
Perform self-diagnosis with CONSULT before performing symptom diagnosis. If DTC is detected, perform the D
corresponding diagnosis.
1.CHECK COOLING SYSTEM E
1. Check engine coolant level and check leakage. Refer to CO-11, "System Inspection".
2. Check reservoir tank cap. Refer to CO-11, "System Inspection".
3. Check water flow sounds of the engine coolant. Refer to CO-11, "System Inspection".
Is the inspection result normal? F
YES >> GO TO 2.
NO >> Refill engine coolant and repair or replace parts depending on the inspection results.
G
2. CHECK HEATER HOSE
Check installation of heater hose visually or by touching.
Is the inspection result normal? H
YES >> GO TO 3.
NO >> Repair or replace parts depending on the inspection results.
3. CHECK HEATER CORE HAC
1. Check temperature of inlet hose and outlet hose of front heater core.
2. Check that inlet side of heater core is hot and the outlet side is slightly lower than/almost equal to the inlet
J
side.
CAUTION:
Always perform the temperature inspection in a short period of time because the engine coolant
temperature is very hot. K
Is the inspection result
normal? YES >> GO
TO 4.
NO >> Replace heater core. Refer to HA-44, "HEATER CORE : Removal and Installation". L
4. CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of front air conditioning system for air leakage.
M
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace parts depending on the inspection results. N
5. CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)
1. Check setting value of temperature setting trimmer (front). Refer to HAC-55, "Temperature Setting Trim-
mer". O
2. Check that temperature setting trimmer (front) is set to “ direction”.
NOTE:
The control temperature can be set by the temperature setting trimmer (front). P
3. Set difference between the set temperature and control temperature to “0”.
Are the symptoms solved?
YES >> Inspection End.
NO >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".

Revision: October 2013 HAC-101 2014 Sentra NAM

 COMPRESSOR DOES NOT OPERATE
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
COMPRESSOR DOES NOT OPERATE
Description INFOID:0000000009757699

Symptom: Compressor does not operate.

Diagnosis Procedure INFOID:0000000009757700

NOTE:
• Perform self-diagnoses with CONSULT before performing symptom diagnosis. If DTC is detected, perform
the corresponding diagnosis.
• Check that refrigerant system is properly charged. If refrigerant amount is below the proper amount,
perform inspection of refrigerant leakage.
1. CHECK MAGNET CLUTCH OPERATION
Check magnet clutch. Refer to HAC-94, "Component Function Check".
Does it operate normally?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning parts.
2. CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to EC-465, "Component Function Check".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace malfunctioning parts.
3. CHECK A/C AUTO AMP. OUTPUT
SIGNAL With CONSULT
Check “COMP REQ SIG” and “FAN REQ SIG” in “DATA MONITOR” mode of “HVAC” using CONSULT.

Monitor item Condition Status

ON On
COMP REQ SIG A/C switch
OFF Off
ON On
FAN REQ SIG Blower motor
OFF Off
Is the inspection result
normal? YES >> GO
TO 4.
NO >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".
4. CHECK ECM INPUT
SIGNAL With CONSULT
Check “AIR COND SIG” and “HEATER FAN SW” in “DATA MONITOR” mode of “ECM” using CONSULT.

Monitor item Condition Status

ON On
AIR COND SIG A/C switch
OFF Off
ON On
HEATER FAN SW Blower motor
OFF Off
Is the inspection result
normal? YES >> GO
TO 5.
NO >> Check CAN communication system. Refer to LAN-16, "Trouble Diagnosis Flow Chart".
5. CHECK IPDM E/R INPUT
SIGNAL With CONSULT
1. Start engine.
 COMPRESSOR DOES NOT OPERATE
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]

Revision: October 2013 HAC-102 2014 Sentra NAM

 COMPRESSOR DOES NOT OPERATE
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
2. Check “AC COMP REQ” in “DATA MONITOR” mode of “IPDM E/R” using CONSULT.
A
Monitor item Condition Status
ON On
AC COMP REQ A/C switch B
OFF Off

Is the inspection result normal?

YES >> Inspection End. C
NO >> Check CAN communication system. Refer to LAN-16, "Trouble Diagnosis Flow Chart".

HAC

Revision: October 2013 HAC-103 2014 Sentra NAM

 A/C SWITCH ASSEMBLY
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONER]

REMOVAL AND INSTALLATION

A/C SWITCH ASSEMBLY
Removal and Installation INFOID:0000000009757701

REMOVAL
1. Remove the CVT shift selector finisher (CVT: RE0F11A). Refer to TM-253, "Removal and Installation".
2. Remove the MT shift selector finisher (6MT: RS6F94R). Refer to TM-22, "Removal and Installation".
3. Remove the A/C switch assembly screws (A).
4. Release the A/C switch assembly metal clips using a suitable
tool.
: Metal clip

ALIIA0664ZZ

5. Disconnect the harness connectors from the A/C switch assembly and remove.
INSTALLATION
Installation is in the reverse order of removal.

Revision: October 2013

HAC-104 2014 Sentra NAM
 A/C AUTO AMP.
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONER]
A/C AUTO AMP.
A
Exploded View INFOID:0000000009757702

HAC
ALIIA0666ZZ

1. AV control unit bracket (LH) 2. AV control unit bracket (RH) 3. A/C auto amp. J
4. AV control unit

Removal and Installation INFOID:0000000009757703

K

REMOVAL
1. Remove the AV control unit. Refer to AV-406, "Removal and Installation". L
2. Remove the AV control unit bracket screws (A).

O
ALIIA0667ZZ

3. Remove the A/C auto amp.

P
INSTALLATION
Installation is in the reverse order of removal.

Revision: October 2013 HAC-105 2014 Sentra NAM

 AMBIENT SENSOR
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONER]
AMBIENT SENSOR
Removal and Installation INFOID:0000000009757704

REMOVAL
1. Remove the front under cover. Refer to EXT-30, "FRONT UNDER COVER : Removal and Installation".
2. Disconnect the harness connector from the ambient sensor.
3. Release the ambient sensor clip, then remove the ambient sen-
sor (1).

ALIIA0668ZZ

INSTALLATION
Installation is in the reverse order of removal.

Revision: October 2013

HAC-106 2014 Sentra NAM
 IN-VEHICLE SENSOR
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONER]
IN-VEHICLE SENSOR
A
Removal and Installation INFOID:0000000009757705

REMOVAL B
1. Remove the instrument lower panel LH. Refer to IP-21, "Removal and Installation".
2. Disconnect the harness connector from the in-vehicle sensor.
C
3. Disconnect the aspirator hose (2) from the in-vehicle sensor.
4. Remove the in-vehicle sensor screw (A) and the in-vehicle sen-
sor (1).
D

F
ALIIA0665ZZ

INSTALLATION
G
Installation is in the reverse order of removal.

HAC

Revision: October 2013 HAC-107 2014 Sentra NAM

 SUNLOAD SENSOR
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONER]
SUNLOAD SENSOR
Removal and Installation INFOID:0000000009757706

REMOVAL
1. Release the defroster grille (LH). Refer to VTL-9, "SIDE DEFROSTER GRILLE : Removal and Installa-
tion".
2. Disconnect the harness connector from the sunload sensor.
3. Release the sunload sensor pawls using a suitable tool, then remove the sunload sensor.
INSTALLATION
Installation is in the reverse order of removal.

Revision: October 2013

HAC-108 2014 Sentra NAM
 INTAKE SENSOR
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONER]
INTAKE SENSOR
A
Removal and Installation INFOID:0000000009757707

The intake sensor is serviced as an assembly with the heating and cooling unit assembly. Refer to HA-43, B
"HEATING AND COOLING UNIT ASSEMBLY : Removal and Installation".

HAC

Revision: October 2013 HAC-109 2014 Sentra NAM

 REFRIGERANT PRESSURE SENSOR
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONER]
REFRIGERANT PRESSURE SENSOR
Removal and Installation INFOID:0000000009757708

REMOVAL
1. Discharge the refrigerant. Refer to HA-23, "Recycle Refrigerant".
2. Remove the core support upper. Refer to HA-39, "Exploded View".
3. Disconnect the harness connector from the refrigerant pressure sensor.
4. Remove the refrigerant pressure sensor (1).
CAUTION:
Cap or wrap the opening of the refrigerant pressure sensor
with suitable material such as vinyl tape to avoid the entry
of air.

ALIIA0669ZZ

INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Do not reuse O-ring.
• Apply A/C oil to the O-ring of the refrigerant pressure sensor for installation.
• After charging refrigerant, check for leaks. Refer to HA-21, "Leak Test".

Revision: October 2013

HAC-110 2014 Sentra NAM
 DOOR MOTOR
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONER]
DOOR MOTOR
A
Exploded View INFOID:0000000009757709

HAC

ALIIA0646ZZ

1. Heating and cooling unit assembly 2. Intake door motor 3. Mode door motor
4. Air mix door motor LH 5. Air mix door motor RH

Revision: October 2013

HAC-111 2014 Sentra NAM
 DOOR MOTOR
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
INTAKE DOOR MOTOR : Removal and Installation INFOID:0000000009757710

REMOVAL
1. Remove the heating and cooling unit assembly. Refer to HA-43, "HEATING AND COOLING UNIT
ASSEMBLY : Removal and Installation".
2. Disconnect the harness connector from the intake door motor.
3. Remove the intake door motor screws and the intake door motor.
INSTALLATION
Installation is in the reverse order of removal.
MODE DOOR MOTOR
MODE DOOR MOTOR : Removal and Installation INFOID:0000000009757711

REMOVAL
1. Remove the front floor duct (LH). Refer to VTL-6, "Exploded View".
2. Disconnect the harness connector from the mode door motor.
3. Remove the mode door motor screws and the mode door motor.
INSTALLATION
Installation is in the reverse order of removal.
AIR MIX DOOR MOTOR
AIR MIX DOOR MOTOR : Removal and Installation - Air Mix Door Motor RH
INFOID:0000000009757712

REMOVAL
1. Remove the glove box. Refer to IP-22, "Removal and Installation".
2. Disconnect the harness connector from the air mix door motor RH.
3. Remove the air mix door motor RH screws and the air mix door motor RH.
INSTALLATION
Installation is in the reverse order of removal.
AIR MIX DOOR MOTOR : Removal and Installation - Air Mix Door Motor LH
INFOID:0000000009757713

REMOVAL
1. Remove the front floor duct (RH). Refer to VTL-6, "Exploded View".
2. Disconnect the harness connector from the air mix door motor LH.
3. Remove the air mix door motor LH screws and the air mix door motor LH.
INSTALLATION
Installation is in the reverse order of removal.

Revision: October 2013

HAC-112 2014 Sentra NAM
 POWER TRANSISTOR
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONER]
POWER TRANSISTOR
A
Removal and Installation INFOID:0000000009757714

REMOVAL B
1. Remove the instrument lower panel LH. Refer to IP-21, "Removal and Installation".
2. Disconnect the harness connector from the power transistor.
C
3. Release the pawls using a suitable tool and remove the power transistor.
INSTALLATION
Installation is in the reverse order of removal. D

HAC

Revision: October 2013 HAC-113 2014 Sentra NAM

 PRECAUTIONS
< PRECAUTION > [MANUAL AIR CONDITIONER]

PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER" INFOID:0000000010287678

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SR and SB section of
this Service Manual.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed
by an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to
personal injury caused by unintentional activation of the system. For removal of Spiral Cable and
Air Bag Module, see the SR section.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the
battery and wait at least three minutes before performing any service.
Precaution for Work INFOID:0000000009757717

• When removing or disassembling each component, be careful not to damage or deform it. If a component
may be subject to interference, be sure to protect it with a shop cloth.
• When removing (disengaging) components with a screwdriver or similar tool, be sure to wrap the
component with a shop cloth or vinyl tape to protect it.
• Protect the removed parts with a shop cloth and prevent them from being dropped.
• Replace a deformed or damaged clip.
• If a part is specified as a non-reusable part, always replace it with a new one.
• Be sure to tighten bolts and nuts securely to the specified torque.
• After installation is complete, be sure to check that each part works properly.
• Follow the steps below to clean components:
- Water soluble dirt:
• Dip a soft cloth into lukewarm water, wring the water out of the cloth and wipe the dirty area.
• Then rub with a soft, dry cloth.
- Oily dirt:
• Dip a soft cloth into lukewarm water with mild detergent (concentration: within 2 to 3%) and wipe the dirty
area.
• Then dip a cloth into fresh water, wring the water out of the cloth and wipe the detergent off.
• Then rub with a soft, dry cloth.
- Do not use organic solvent such as thinner, benzene, alcohol or gasoline.
- For genuine leather seats, use a genuine leather seat cleaner.
Working with HFC-134a (R-134a) INFOID:0000000009757718

WARNING:
• CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed compressor failure is likely to occur. Refer to HA-25, "Inspection". To determine the
purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant Recovery/Recycling
Recharg- ing equipment and Refrigerant Identifier.

Revision: October 2013 HAC-114 2014 Sentra NAM

 PRECAUTIONS
< PRECAUTION > [MANUAL AIR CONDITIONER]
• Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If
oil other than that specified is used, compressor failure is likely to occur. A
• The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following
handling precautions must be observed:
- When removing refrigerant components from a vehicle, immediately cap (seal) the component to B
minimize the entry of moisture from the atmosphere.
- When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just
before connecting the components. Connect all refrigerant loop components as quickly as possible
to minimize the entry of moisture into system. C
- Only use the specified oil from a sealed container. Immediately reseal containers of oil. Without
proper sealing, oil will become moisture saturated and should not be used.
- Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat. D
Remove HFC-134a (R-134a) from the A/C system using certified service equipment meeting require-
ments of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-134a) recy-
cling equipment], If accidental system discharge occurs, ventilate work area before resuming
service. Additional health and safety information may be obtained from refrigerant and oil manufac- E
turers.
- Do not allow A/C oil to come in contact with styrofoam parts. Damage may result.
CONTAMINATED REFRIGERANT F
If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:
• Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into
the atmosphere. G
• Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant
supply.
• Suggest the customer return the vehicle to the location of previous service where the contamination may H
have occurred.
• If you choose to perform the repair, recover the refrigerant using only dedicated equipment and contain-
ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility
does not have dedicated recovery equipment, you may contact a local refrigerant product retailer for HAC
available ser- vice. This refrigerant must be disposed of in accordance with all federal and local regulations.
In addition, replacement of all refrigerant system components on the vehicle is recommended.
• If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact NISSAN Cus- J
tomer Affairs for further assistance.
Precaution for Service Equipment INFOID:0000000009757719

K
MANIFOLD GAUGE SET
Be certain that the gauge face indicates R-134a or 134a. Make sure
the gauge set has 1/2-16 ACME threaded connections for service L
hoses. Confirm the set has been used only with refrigerant HFC-
134a (R-134a) along with specified oil.
M

SHA533D

SERVICE HOSES O

Revision: October 2013 HAC-115 2014 Sentra NAM

 PRECAUTIONS
< PRECAUTION > [MANUAL AIR CONDITIONER]
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive
shut- off devices (either manual or automatic) near the end of the
hoses opposite the manifold gauge.

RHA272D

SERVICE COUPLERS
Do not attempt to connect HFC-134a (R-134a) service couplers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. However, if an
improper connection is attempted, discharging and contamination
may occur.

Shut-off valve rotation A/C service valve

Clockwise Open
Counterclockwise Close
RHA273D

Revision: October 2013

HAC-116 2014 Sentra NAM
 PREPARATION
< PREPARATION > [MANUAL AIR CONDITIONER]

PREPARATION A
PREPARATION
Special Service Tool INFOID:0000000009757720
B

The actual shape of the tools may differ from those illustrated here.
Tool number Description
(TechMate No.) C
Tool name
— Removing trim components
(J-46534) D
Trim Tool Set

AWJIA0483ZZ
F
Commercial Service Tool INFOID:0000000009757721

G
Tool name Description
Power tool Loosening nuts, screws and bolts

HAC

PIIB1407E

Revision: October 2013 HAC-117 2014 Sentra NAM

 COMPONENT PARTS
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]

SYSTEM DESCRIPTION
COMPONENT PARTS
Component Part Location INFOID:0000000009757722

ALIIA0705ZZ

Revision: October 2013

HAC-118 2014 Sentra NAM
 COMPONENT PARTS
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]

E
ALIIA0706ZZ

1. ECM 2. IPDM E/R 3. BCM (view with combination meter

F
removed)
4. A/C auto amp. (view with A/C switch 5. A/C switch assembly 6. A/C Compressor
assembly removed)
7. Refrigerant pressure sensor (view 8. Fuse Block (J/B), Front blower motor 9. Blower motor (view with front A/C G
with front bumper fascia removed) relay assembly removed from vehicle)
10. Mode door motor 11. Intake door motor 12. Air mix door motor
13. Intake sensor 14. Variable blower control H

Component Description INFOID:0000000009757723

HAC

Component Description
A/C auto amp. controls front automatic air conditioning system by inputting and calculating signals J
A/C auto amp.
from each sensor and each switch.
Vaporized refrigerant is drawn into the A/C compressor from the evaporator, where it is
A/C Compressor compressed to a high pressure, high temperature vapor. The hot, compressed vapor is then
discharged to the con- denser. K
The A/C switch assembly controls the operation of the A/C and heating system based on inputs
from the temperature control knob, the mode switches, the blower control dial, the ambient
A/C switch assembly L
temperature sensor, the intake sensor, and inputs received from the ECM across the CAN.
Diagnosis of the A/C switch assembly can be performed using the CONSULT. There is no self-
diagnostic feature available.
The air mix door controls the mix of hot or cold air that enters the ventilation system. It is controlled
Air mix door motor by the A/C auto amp. based on the position of the temperature dial. The air mix door motor LH re-
M
ceives position commands from the A/C auto amp.
The BCM receives the fan ON and A/C ON signals from the A/C auto amp. and sends a
BCM
compressor ON request to the ECM. N
Blower motor The blower motor varies the speed at which the air flows through the ventilation system.
The ECM sends a compressor ON request to the IPDM E/R based on the status of engine
ECM operation and load as well as refrigerant pressure information. If all the conditions are met for A/C O
operation, the ECM transmits the compressor ON request to the IPDM E/R.
The blower motor relay controls the flow of current to fuse 20, 21 and 22 in the Fuse Block (J/B).
Blower motor relay The relay is connected directly to ground, and is energized when the ignition switch is in the ON or P
START position.
Located in the passenger compartment, behind the left lower IP, the Fuse Block (J/B) contains the
Fuse Block (J/B)
front blower motor relay and several fuses required for the air conditioner control system.
The intake door motor controls the position of the intake door. Fresh air is allowed to enter the cabin
Intake door motor in one position, and recirculated inside air is allowed to enter in the other position. The intake door
motor receives position commands from the A/C auto amp.

Revision: October 2013

 COMPONENT PARTS
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
HAC-119 2014 Sentra
NAM
 COMPONENT PARTS
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
Component Description
The intake sensor measures the temperature of the front evaporator fins. The sensor uses a ther-
Intake sensor mistor which is sensitive to the change in temperature. The electrical resistance of the thermistor de-
creases as temperature increases.
Refer to PCS-7, "RELAY CONTROL SYSTEM : System Description" (with Intelligent Key system) or
IPDM E/R
PCS-35, "RELAY CONTROL SYSTEM : System Description" (without Intelligent Key system).
The mode door controls the direction the conditioned air passes through the ventilation system.
Through a series of levers and gears, the mode door controls the defrost door, the foot door, and the
Mode door motor
vent door. There are 5 preset positions: VENT, B/L, FOOT, D/F, and DEF. The mode door motor re-
ceives position commands from the A/C auto amp.
Refrigerant pressure sensor Refer to EC-29, "Refrigerant Pressure Sensor".

Revision: October 2013

HAC-120 2014 Sentra NAM
 SYSTEM
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
SYSTEM
A
System Diagram INFOID:0000000009757724

HAC

ALIIA0709GB O

System Description INFOID:0000000009757725

P
• The manual air conditioning system is controlled by a sequence of functions from the front air control,
BCM, ECM, and IPDM E/R.
Controlled by front air control:
- HAC-122, "Air Flow Control"
- HAC-122, "Air Inlet Control"
- HAC-122, "Air Outlet Control"

Revision: October 2013 HAC-121 2014 Sentra NAM

 SYSTEM
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
- HAC-122, "Compressor Control"
- HAC-123, "Door Control"
- HAC-126, "Temperature Control"
Controlled by BCM:
- Air conditioning request signal.
Refer to BCS-8, "BODY CONTROL SYSTEM : System Description" (with Intelligent Key system) or BCS-79,
"BODY CONTROL SYSTEM : System Description" (without Intelligent Key system).
Control by ECM
- Cooling fan control
Refer to EC-47, "COOLING FAN CONTROL : System Description".
- Air conditioning cut control
Refer to EC-46, "AIR CONDITIONING CUT CONTROL : System Description".
Control by IPDM E/R
- Relay control
Refer to PCS-7, "RELAY CONTROL SYSTEM : System Description" (with Intelligent Key system) or PCS-
35, "RELAY CONTROL SYSTEM : System Description" (without Intelligent Key system).
- Cooling fan control
Refer to EC-47, "COOLING FAN CONTROL : System Description".
Air Flow Control INFOID:0000000009757726

DESCRIPTION
• Front air control changes duty ratio of front blower motor control signal to control air flow continuously.
When air flow is increased, duty ratio of front blower motor control signal gradually increases to prevent a
sudden increase in air flow.
• In addition to manual control, air flow control is composed of fan speed control at door motor operation.
FAN SPEED CONTROL AT DOOR MOTOR OPERATION
When mode door motor is activated while air flow is more than the specified value, front air control
temporarily reduces fan speed so that mode door moves smoothly.
Air Inlet Control INFOID:0000000009757727

The intake door position is automatically controlled in MAX A/C and DEF modes. The intake door is
controlled by customer input in the other modes.
Air Outlet Control INFOID:0000000009757728

Air outlet control is controlled by customer input. When the A/C is turned off by turning the blower control dial
fully counterclockwise, the front air control retains the current selections and returns to these selections the
next time the blower control dial is turned to any fan position.

NOTE:
If ambient temperature is excessively low, D/F is selected to prevent windshield fogging when air outlet is set
to FOOT.
Compressor Control INFOID:0000000009757729

DESCRIPTION
In order for the IPDM E/R to complete a compressor ON request, the following conditions must be met:
1. The BCM detects a Fan ON signal from the front air control. The front air control grounds the fan ON sig-
nal monitored by the BCM when the blower speed dial is in any of the fan speed positions.
2. The BCM detects an A/C ON signal from the front air control. The front air control grounds the A/C ON
sig- nal monitored by the BCM when:
- The A/C switch is pressed. The A/C switch LED illuminates and the front air control grounds the A/C ON
signal monitored by the BCM. Any mode control button except D/F may be selected.
- The A/C switch is OFF, and the MAX A/C button is pressed. The A/C switch LED will automatically illumi-
nate and the front air control grounds the A/C ON signal monitored by the BCM.

Revision: October 2013

HAC-122 2014 Sentra NAM
 SYSTEM
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
- The A/C switch is OFF, and the mode button for either D/F or DEF is selected. The front air control
grounds the A/C ON signal monitored by the BCM, but it does not illuminate the A/C switch LED A
NOTE:
If the compressor was engaged by pressing the D/F or DEF mode buttons, and the time spent in either mode
exceeds 1 minute, then the compressor stays requested, even when modes other than D/F or DEF are B
selected, until either:
1. The ignition switch is turned OFF.
2. The blower speed dial is turned completely counterclockwise to the OFF position.
3. The A/C switch is manually turned OFF. C
In other words, the compressor ON request cannot be turned off in D/F or DEF modes.
REFRIGERANT PRESSURE PROTECTION
The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen- D
sor, located on the liquid tank on the condenser. The refrigerant pressure sensor detects the pressure inside
the refrigerant line and sends a voltage signal to the ECM. If the system pressure rises above or falls below
the following values, the ECM requests the IPDM E/R to de-energize the A/C relay and disengage the com- E
pressor.
• 3.12 MPa (31.82 kg/cm2, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
• 2.74 MPa (27.95 kg/cm2, 397.3 psi) or more (When the engine speed is 1,500 rpm or more) F
• 0.14 MPa (1.43 kg/cm2, 20.3 psi) or less
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor. G
When the pressure of refrigerant in the system increases to an abnormal level [more than 2,990 kPa (30.5 kg/
cm2, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere. H
COMPRESSOR OIL CIRCULATION CONTROL
When the engine starts while the engine coolant temperature is 56C (133F) or less, ECM activates the com-
pressor for approximately 6 seconds and circulates the compressor lubricant once. HAC

LOW TEMPERATURE PROTECTION CONTROL

• When the intake sensor detects that the front evaporator fin temperature is 1.5C (35F) or less, the front air J
control requests the BCM to turn the compressor OFF, and stops the compressor.
• When the front evaporator fin temperature returns to 5.0C (41F) or more, the compressor is activated.
OPERATING RATE CONTROL K
When the set temperature is other than fully cold or the air outlet is “VENT”, “B/L” or “FOOT”, the front air con-
trol controls the compressor activation depending on ambient temperature.
Door Control INFOID:0000000009757730 L

AIR MIX DOOR MOTOR

M
DESCRIPTION
• The step motor system is adopted for air mix door motor.
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor rotates
according to the drive signal, and then stops at the target door position. N
• Rotation of motor is transmitted to air mix door (upper air mix door and lower air mix door) by link, rod and
lever, then air flow temperature is switched.
DRIVE METHOD O
• The 4 drive coils are excited in sequence in order to drive the motor.

Revision: October 2013 HAC-123 2014 Sentra NAM

 SYSTEM
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
• Direction of rotation is changeable by recomposing pattern of excitation.

JSIIA1655GB

MODE DOOR MOTOR

DESCRIPTION
• The step motor system is adopted for mode door motor.
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor
rotates according to the drive signal, and then stops at the target door position.
• Rotation of motor is transmitted to mode door (center ventilator and defroster door, sub defroster door, side
ventilator door, and foot door) by link, rod, and lever, then air outlet is switched.
DRIVE METHOD
• The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing pattern of excitation.

JZIIA0033GB

INTAKE DOOR MOTOR

• Motor operates intake door according to control signal from A/C auto amp.
• Rotation of motor is transmitted to intake door by lever, then air inlet is switched.
SWITCHES AND THEIR CONTROL FUNCTION

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HAC-124 2014 Sentra NAM
 SYSTEM
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]

HAC
JMIIA1958ZZ

Intake door Blower motor Air conditioner filter

Evaporator Upper air mix door (driver side/pas- Lower air mix door (driver
J
side/pas- senger side) senger side)
Heater core Foot door Side ventilator door
K
Sub defroster door Center ventilator and defroster door
Fresh air intake Recirculation air Discharge air
Defroster Center ventilator Side ventilator L

Rear ventilator Front foot Rear foot

M

Revision: October 2013 HAC-125 2014 Sentra NAM

 SYSTEM
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]

Door position
Mode door Air mix door

Center ventilator and defroster door

Side ventilator door

Sub defroster door

Upper air mix door

Lower air mix door

Intake door
Foot door
Switch position

MODE switch
—

— —
DEF switch

REC switch

FRE switch
Full cold — — — —
18C
Temperature control switch
Full hot —
32C
ON·OFF switch OFF — —

AIR DISTRIBUTION

Discharge air flow

Air outlet/distribution

MODE/DEF set- Ventilator Foot

ting position Front Defroster
Rear Front Rear
Center Side
48.7% 37.4% 13.9% — — —
26.6% 25.6% 13.2% 23.6% 11.0% —

— 15.6% 16.9% 32.9% 16.3% 18.3%

— 13.4% 15.1% 27.0% 14.3% 30.2%

— 17.5% 18.8% — — 63.7%

Temperature Control INFOID:0000000009757731

• When the ignition switch is in the ON position, the customer uses the front air control temperature control
dial to set the desired temperature.
• The front air control calculates the target front air mix door opening angle depending on the selected
temper- ature, intake temperature sensor, engine coolant temperature and rpm, and ambient temperature.
• Front air mix door is controlled depending on the comparison of current front air mix door opening angle
and target front air mix door opening angle.
• Regardless of ambient temperature, the front air mix door is fixed at the fully cold position when the
temper- ature control dial is set at the full cold position and fixed at the fully hot position when the
temperature control dial is set at the full hot position.

Revision: October 2013 HAC-126 2014 Sentra NAM

 OPERATION
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
OPERATION
A
Switch Name and Function INFOID:0000000009757732

B
A/C Switch Assembly

ALIIA0604ZZ H

1. A/C switch 2. Blower control dial (with OFF switch) 3. DEF switch
4. Rear DEF switch 5. REC switch 6. Temperature control dial HAC
7. MAX A/C switch 8. D/F switch 9. FOOT switch
10. B/L switch 11. VENT switch
J
Switch Operation

Switches the compressor control switch indicator between ON  OFF with each press while front
K
blower fan is activated. The circuit used by the BCM to detect an A/C ON request is grounded.
A/C switch
NOTE:
When front blower fan is OFF, the compressor control cannot be activated.
• Blower fan speed is manually controlled with the dial for varying blower speed. When ON, the L
circuit used by the BCM to detect a fan ON request signal is grounded.
Blower control dial (with • Turns air conditioning system OFF.
OFF switch) NOTE:
When blower control dial is turned to any ON position the air conditioning system is activated. M
(Com- pressor control state returns to the previous state before air conditioning system was turned
OFF.)
Switches DEF mode (switch indicator) between ON  OFF with each press. N
• When DEF mode is turned ON, the air conditioning system changes to the following state.
- Air inlet: Fresh air intake
- Air outlet: DEF
- Blower fan: Manual setting. O
- Compressor: ON
DEF switch
• When DEF mode is turned OFF, the air conditioning system state returns to the previous state
be- fore DEF mode was selected, but the following state is continued:
- Air inlet: Fresh air intake P
- Compressor: ON
NOTE:
When front blower fan is OFF, DEF cannot be activated.

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 OPERATION
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
Switches the MAX A/C and compressor control switch indicators between ON  OFF with each
press while front blower fan is activated.
• When MAX A/C mode is turned ON, the air conditioning system changes to the following state.
- Air inlet: Recirculation air intake
- Air outlet: Manual setting
- Blower fan: Manual setting.
MAX A/C switch - Compressor: ON
• When MAX A/C mode is turned OFF, the air conditioning system state returns to the previous
state before MAX A/C mode is selected. But, the following state is changed:
- Air inlet: Fresh air intake
- Compressor: ON
NOTE:
When front blower fan is OFF, the compressor control cannot be activated.
Selects air outlet from VENT, B/L, FOOT, and D/F.
MODE switches NOTE:
When the air conditioning system is OFF, the air outlet can still be selected.
• Air inlet is selected to fresh air intake (REC) by pressing this switch.
- REC indicator: ON
REC switch NOTE:
• When the air conditioning system is OFF, the air inlet can still be selected.
• When D/F mode or DEF is selected, the REC button is disabled.
• Selects desired temperature between full cold and full hot.
Temperature control dial - Clockwise rotation: Temperature increases.
- Counterclockwise rotation: Temperature decreases.

Revision: October 2013 HAC-128 2014 Sentra NAM

 DIAGNOSIS SYSTEM (BCM) (WITH INTELLIGENT KEY
< SYSTEMSYSTEM)
DESCRIPTION > [MANUAL AIR CONDITIONER]
DIAGNOSIS SYSTEM (BCM) (WITH INTELLIGENT KEY SYSTEM)
A
COMMON ITEM
COMMON ITEM : CONSULT Function (BCM - COMMON ITEM) INFOID:0000000010291114

B
APPLICATION ITEM
CONSULT performs the following functions via CAN communication with BCM.
C
Direct Diagnostic Mode Description
ECU identification The BCM part number is displayed.
Self Diagnostic Result The BCM self diagnostic results are displayed. D
Data Monitor The BCM input/output data is displayed in real time.
Active Test The BCM activates outputs to test components.
E
Work support The settings for BCM functions can be changed.
• The vehicle specification can be read and saved.
Configuration
• The vehicle specification can be written when replacing BCM.
F
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication is displayed.

SYSTEM APPLICATION
G
BCM can perform the following functions.

Direct Diagnostic Mode

H

CAN DIAG SUPPORT MNTR

Self Diagnostic Result
HAC
ECU identification

System Sub System

Configuration
Work support
Data Monitor

Active Test
J

K
Door lock DOOR LOCK    
Rear window defogger REAR DEFOGGER  
Warning chime BUZZER   L
Interior room lamp timer INT LAMP   
Exterior lamp HEAD LAMP   
Wiper and washer WIPER    M
Turn signal and hazard warning lamps FLASHER   
Air conditioner AIR CONDITIONER 
N
Intelligent Key system INTELLIGENT KEY    
Combination switch COMB SW 
BCM BCM      O
Immobilizer IMMU    
Interior room lamp battery saver BATTERY SAVER   
Trunk open TRUNK  P
Vehicle security system THEFT ALM   
RAP system RETAINED PWR 
Signal buffer system SIGNAL BUFFER 
TPMS AIR PRESSURE MONITOR    

Revision: October 2013 HAC-129 2014 Sentra NAM

 DIAGNOSIS SYSTEM (BCM) (WITH INTELLIGENT KEY
< SYSTEMSYSTEM)
DESCRIPTION > [MANUAL AIR CONDITIONER]
AIR CONDITIONER
AIR CONDITIONER : CONSULT Function (BCM - AIR CONDITIONER) INFOID:0000000010291115

DATA MONITOR

Monitor Item [Unit] Description

FAN ON SIG [On/Off] Indicates condition of fan switch.
AIR COND SW [On/Off] Indicates condition of A/C switch.

Revision: October 2013

HAC-130 2014 Sentra NAM
 DIAGNOSIS SYSTEM (BCM) (WITHOUT INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
DIAGNOSIS SYSTEM (BCM) (WITHOUT INTELLIGENT KEY SYSTEM)
A
COMMON ITEM
COMMON ITEM : CONSULT Function (BCM - COMMON ITEM) INFOID:0000000010291116

B
APPLICATION ITEM
CONSULT performs the following functions via CAN communication with BCM.
C
Direct Diagnostic Mode Description
ECU identification The BCM part number is displayed.
Self Diagnostic Result The BCM self diagnostic results are displayed. D
Data Monitor The BCM input/output data is displayed in real time.
Active Test The BCM activates outputs to test components.
E
Work support The settings for BCM functions can be changed.
• The vehicle specification can be read and saved.
Configuration
• The vehicle specification can be written when replacing BCM.
F
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication is displayed.

SYSTEM APPLICATION
G
BCM can perform the following functions.

Direct Diagnostic Mode

H

CAN DIAG SUPPORT MNTR

Self Diagnostic Result
HAC
ECU identification

System Sub System

Configuration
Work support
Data Monitor

Active Test
J

K
Door lock DOOR LOCK    
Rear window defogger REAR DEFOGGER  
Warning chime BUZZER   L
Interior room lamp timer INT LAMP   
Remote keyless entry system MULTI REMOTE ENT   
Exterior lamp HEAD LAMP    M
Wiper and washer WIPER   
Turn signal and hazard warning lamps FLASHER  
N
Air conditioner AIR CONDITIONER 
Combination switch COMB SW 
BCM BCM      O
Immobilizer IMMU   
Interior room lamp battery saver BATTERY SAVER   
Trunk open TRUNK  P
RAP system RETAINED PWR  
Signal buffer system SIGNAL BUFFER 
TPMS AIR PRESSURE MONITOR    
Panic alarm system PANIC ALARM 

Revision: October 2013 HAC-131 2014 Sentra NAM

 DIAGNOSIS SYSTEM (BCM) (WITHOUT INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
AIR CONDITIONER
AIR CONDITIONER : CONSULT Function (BCM - AIR CONDITIONER) INFOID:0000000010291117

DATA MONITOR

Monitor Item [Unit] Description

IGN ON SW [On/Off] Indicates condition of ignition switch ON position.
FAN ON SIG [On/Off] Indicates condition of fan switch.
AIR COND SW [On/Off] Indicates condition of A/C switch.
THERMO AMP [On/Off] Indicates condition of thermo amp.
FR DEF SW [On/Off] Indicates condition of front defrost switch.

Revision: October 2013

HAC-132 2014 Sentra NAM
 DIAGNOSIS SYSTEM (IPDM E/R) (WITH INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
DIAGNOSIS SYSTEM (IPDM E/R) (WITH INTELLIGENT KEY SYSTEM)
A
Diagnosis Description INFOID:0000000010291118

AUTO ACTIVE TEST B

Description
In auto active test, the IPDM E/R sends a drive signal to the following systems to check their operation.
• Front wiper (LO, HI) C
• Parking lamp
• License plate lamp
• Tail lamp D
• Front fog lamp (if equipped)
• Headlamp (LO, HI)
• A/C compressor (magnet clutch)
• Cooling fan E

Operation Procedure
NOTE:
F
Never perform auto active test in the following conditions.
• Passenger door is open
• CONSULT is connected
1. Close the hood and lift the wiper arms from the windshield. (Prevent windshield damage due to wiper G
operation)
NOTE:
When auto active test is performed with hood opened, sprinkle water on windshield beforehand. H
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON, and within 20 seconds, press the driver door switch 10 times. Then turn the
ignition switch OFF. HAC
4. Turn the ignition switch ON within 10 seconds. After that the horn sounds once and the auto active test
starts.
5. After a series of the following operations is repeated 3 times, auto active test is completed. J
NOTE:
• When auto active test has to be cancelled halfway through test, turn the ignition switch OFF.
• When auto active test is not activated, door switch may be the cause. Check door switch. Refer to DLK-103, K
"Component Inspection".
Inspection in Auto Active Test
When auto active test is actuated, the following operation sequence is repeated 3 times. L

Operation se-
Inspection location Operation
quence
M
1 Front wiper LO for 5 seconds  HI for 5 seconds
• Parking lamp
• License plate lamp
2
• Tail lamp
10 seconds N
• Front fog lamp (if equipped)
3 Headlamp LO for 10 seconds HI ON  OFF 5 times
O
4 A/C compressor (magnet clutch) ON  OFF 5 times
5 Cooling fan LO for 5 seconds  MID for 3 seconds  HI for 2 seconds

Revision: October 2013 HAC-133 2014 Sentra NAM

 DIAGNOSIS SYSTEM (IPDM E/R) (WITH INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
Concept of Auto Active Test

AWMIA1509GB

• IPDM E/R starts the auto active test with the door switch signals transmitted by BCM via CAN communica-
tion. Therefore, the CAN communication line between IPDM E/R and BCM is considered normal if the auto
active test starts successfully.
• The auto active test facilitates troubleshooting if any systems controlled by IPDM E/R cannot be operated.
Diagnosis Chart in Auto Active Test

Symptom Inspection contents Possible cause

Any of the following components do not operate YES BCM signal input circuit
• Parking lamp
• License plate lamp Perform auto active test. • Lamp or motor
• Tail lamp Does the applicable system op- • Lamp or motor ground circuit
• Front fog lamp (if equipped) erate? NO • Harness or connector between
• Headlamp (HI, LO) IPDM E/R and applicable
• Front wiper (HI, LO) system
• IPDM E/R
• BCM signal input circuit
• CAN communication signal
YES be- tween BCM and ECM
Perform auto active test. • CAN communication signal
A/C compressor does not operate Does the magnet clutch oper- be- tween ECM and IPDM E/R
ate? • Magnet clutch
• Harness or connector
NO
between IPDM E/R and
magnet clutch
• IPDM E/R
• ECM signal input circuit
YES • CAN communication signal
be- tween ECM and IPDM E/R
Perform auto active test.
Cooling fan does not operate • Cooling fan motor
Does the cooling fan
operate? • Harness or connector between
NO
IPDM E/R and cooling fan
motor
• IPDM E/R

CONSULT Function (IPDM E/R) INFOID:0000000010291119

APPLICATION ITEM
CONSULT performs the following functions via CAN communication with IPDM E/R.

Direct Diagnostic Mode Description

Ecu Identification The IPDM E/R part number is displayed.
Self Diagnostic Result The IPDM E/R self diagnostic results are displayed.
Data Monitor The IPDM E/R input/output data is displayed in real time.
 DIAGNOSIS SYSTEM (IPDM E/R) (WITH INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
Revision: October 2013
HAC-134 2014 Sentra NAM
 DIAGNOSIS SYSTEM (IPDM E/R) (WITH INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
Direct Diagnostic Mode Description
Active Test The IPDM E/R activates outputs to test components. A
CAN Diag Support Mntr The result of transmit/receive diagnosis of CAN communication is displayed.

ECU IDENTIFICATION B
The IPDM E/R part number is displayed.
SELF DIAGNOSTIC RESULT
C
Refer to PCS-20, "DTC Index".
DATA MONITOR
D
Main
Monitor Item [Unit] Description
Signals
Indicates cooling fan speed signal received from ECM on CAN communication
MOTOR FAN REQ [%]  E
line
Indicates A/C compressor request signal received from ECM on CAN commu-
AC COMP REQ [On/Off] 
nication line
Indicates position light request signal received from BCM on CAN communica-
F
TAIL&CLR REQ [On/Off] 
tion line
Indicates low beam request signal received from BCM on CAN communication
HL LO REQ [On/Off]  G
line
Indicates high beam request signal received from BCM on CAN
HL HI REQ [On/Off] 
communication line
Indicates front fog light request signal received from BCM on CAN communica- H
FR FOG REQ [On/Off] 
tion line
Indicates front wiper request signal received from BCM on CAN
FR WIP REQ [Stop/1LOW/Low/Hi] 
communication line HAC
WIP AUTO STOP [STOP P/ACT P]  Indicates condition of front wiper auto stop signal
WIP PROT [Off/BLOCK]  Indicates condition of front wiper fail-safe operation
J
Indicates ignition switch ON signal received from BCM on CAN communication
IGN RLY1 -REQ [On/Off]
line
IGN RLY [On/Off]  Indicates condition of ignition relay
K
PUSH SW [On/Off] Indicates condition of push-button ignition switch
INTER/NP SW [On/Off] Indicates condition of CVT shift position
Indicates starter relay status signal received from BCM on CAN L
ST RLY CONT [On/Off]
communication line
Indicates starter control relay signal received from BCM on CAN
IHBT RLY -REQ [On/Off]
communication line
M
ST/INHI RLY [Off/ ST /INHI] Indicates condition of starter relay and starter control relay
DETENT SW [On/Off] Indicates condition of CVT shift selector (park position switch)

DTRL REQ [Off]

Indicates daytime light request signal received from BCM on CAN communica- N
tion line
Indicates theft warning horn request signal received from BCM on CAN
THFT HRN REQ [On/Off]
commu- nication line
O
HORN CHIRP [On/Off] Indicates horn reminder signal received from BCM on CAN communication line

ACTIVE TEST P

Test item Description

HORN This test is able to check horn operation [On].
REAR DEFOGGER This test is able to check rear window defogger operation [On/Off].
FRONT WIPER This test is able to check wiper motor operation [Hi/Lo/Off].

Revision: October 2013

HAC-135 2014 Sentra NAM
 DIAGNOSIS SYSTEM (IPDM E/R) (WITH INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
Test item Description
MOTOR FAN This test is able to check cooling fan operation [4/3/2/1].
EXTERNAL LAMPS This test is able to check external lamp operation [Fog/Hi/Lo/TAIL/Off].

CAN DIAG SUPPORT MNTR

Refer to LAN-13, "CAN Diagnostic Support Monitor".

Revision: October 2013

HAC-136 2014 Sentra NAM
 DIAGNOSIS SYSTEM (IPDM E/R) (WITHOUT INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
DIAGNOSIS SYSTEM (IPDM E/R) (WITHOUT INTELLIGENT KEY SYS-
A
TEM)
Diagnosis Description INFOID:0000000010291120

B
AUTO ACTIVE TEST
Description C
In auto active test, the IPDM E/R sends a drive signal to the following systems to check their operation.
• Front wiper (LO, HI)
• Parking lamp
• License plate lamp D
• Tail lamp
• Front fog lamp (if equipped)
• Headlamp (LO, HI) E
• A/C compressor (magnet clutch) (if equipped)
• Cooling fan
Operation Procedure F
NOTE:
Never perform auto active test in the following conditions.
• Passenger door is open
• CONSULT is connected G
1. Close the hood and lift the wiper arms from the windshield. (Prevent windshield damage due to wiper
operation)
H
NOTE:
When auto active test is performed with hood opened, sprinkle water on windshield beforehand.
2. Turn the ignition switch OFF.
HAC
3. Turn the ignition switch ON, and within 20 seconds, press the driver door switch 10 times. Then turn the
ignition switch OFF.
4. Turn the ignition switch ON within 10 seconds. After that the horn sounds once and the auto active test
starts. J
5. After a series of the following operations is repeated 3 times, auto active test is completed.
NOTE:
• When auto active test has to be cancelled halfway through test, turn the ignition switch OFF. K
• When auto active test is not activated, door switch may be the cause. Check door switch. Refer to DLK-
255, "Component Inspection".
L
Inspection in Auto Active Test
When auto active test is actuated, the following operation sequence is repeated 3 times.

Operation se- M
Inspection location Operation
quence
1 Front wiper LO for 5 seconds  HI for 5 seconds
• Parking lamp N
• License plate lamp
2 10 seconds
• Tail lamp
• Front fog lamp (if equipped)
O
3 Headlamp LO for 10 seconds HI ON  OFF 5 times
4 A/C compressor (magnet clutch) (if equipped) ON  OFF 5 times
5 Cooling fan LO for 5 seconds  MID for 3 seconds  HI for 2 seconds P

Revision: October 2013 HAC-137 2014 Sentra NAM

 DIAGNOSIS SYSTEM (IPDM E/R) (WITHOUT INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
Concept of Auto Active Test

AWMIA1511GB

• IPDM E/R starts the auto active test with the door switch signals transmitted by BCM via CAN communica-
tion. Therefore, the CAN communication line between IPDM E/R and BCM is considered normal if the auto
active test starts successfully.
• The auto active test facilitates troubleshooting if any systems controlled by IPDM E/R cannot be operated.
Diagnosis Chart in Auto Active Test

Symptom Inspection contents Possible cause

Any of the following components do not operate YES BCM signal input circuit
• Parking lamp
• License plate lamp Perform auto active test. • Lamp or motor
• Tail lamp Does the applicable system op- • Lamp or motor ground circuit
• Front fog lamp (if equipped) erate? NO • Harness or connector between
• Headlamp (HI, LO) IPDM E/R and applicable
• Front wiper (HI, LO) system
• IPDM E/R
• BCM signal input circuit
• CAN communication signal
YES be- tween BCM and ECM
Perform auto active test. • CAN communication signal
A/C compressor does not operate Does the magnet clutch oper- be- tween ECM and IPDM E/R
ate? • Magnet clutch
• Harness or connector
NO
between IPDM E/R and
magnet clutch
• IPDM E/R
• ECM signal input circuit
YES • CAN communication signal
be- tween ECM and IPDM E/R
Perform auto active test.
Cooling fan does not operate • Cooling fan motor
Does the cooling fan
operate? • Harness or connector between
NO
IPDM E/R and cooling fan
motor
• IPDM E/R

CONSULT Function (IPDM E/R) INFOID:0000000010291121

APPLICATION ITEM
CONSULT performs the following functions via CAN communication with IPDM E/R.

Direct Diagnostic Mode Description

Ecu Identification The IPDM E/R part number is displayed.
Self Diagnostic Result The IPDM E/R self diagnostic results are displayed.
Data Monitor The IPDM E/R input/output data is displayed in real time.
 DIAGNOSIS SYSTEM (IPDM E/R) (WITHOUT INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
Revision: October 2013
HAC-138 2014 Sentra NAM
 DIAGNOSIS SYSTEM (IPDM E/R) (WITHOUT INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
Direct Diagnostic Mode Description
Active Test The IPDM E/R activates outputs to test components. A
CAN Diag Support Mntr The result of transmit/receive diagnosis of CAN communication is displayed.

ECU IDENTIFICATION B
The IPDM E/R part number is displayed.
SELF DIAGNOSTIC RESULT
C
Refer to PCS-48, "DTC Index".
DATA MONITOR
D
Main
Monitor Item [Unit] Description
Signals
Indicates cooling fan speed signal received from ECM on CAN communication
MOTOR FAN REQ [%]  E
line
Indicates A/C compressor request signal received from ECM on CAN commu-
AC COMP REQ [On/Off] 
nication line
Indicates position light request signal received from BCM on CAN communica-
F
TAIL&CLR REQ [On/Off] 
tion line
Indicates low beam request signal received from BCM on CAN communication
HL LO REQ [On/Off]  G
line
Indicates high beam request signal received from BCM on CAN
HL HI REQ [On/Off] 
communication line
Indicates front fog light request signal received from BCM on CAN communica- H
FR FOG REQ [On/Off] 
tion line
Indicates front wiper request signal received from BCM on CAN
FR WIP REQ [Stop/1LOW/Low/Hi] 
communication line HAC
WIP AUTO STOP [STOP P/ACT P]  Indicates condition of front wiper auto stop signal
WIP PROT [Off/BLOCK]  Indicates condition of front wiper fail-safe operation
J
Indicates ignition switch ON signal received from BCM on CAN communication
IGN RLY1 -REQ [On/Off]
line
IGN RLY [On/Off]  Indicates condition of ignition relay
K
PUSH SW [On/Off] Indicates condition of push-button ignition switch
INTER/NP SW [On/Off] Indicates condition of CVT shift position
Indicates starter relay status signal received from BCM on CAN L
ST RLY CONT [On/Off]
communication line
Indicates starter control relay signal received from BCM on CAN
IHBT RLY -REQ [On/Off]
communication line
M
ST/INHI RLY [Off/ ST /INHI] Indicates condition of starter relay and starter control relay
DETENT SW [On/Off] Indicates condition of CVT shift selector (park position switch)

DTRL REQ [Off]

Indicates daytime light request signal received from BCM on CAN communica- N
tion line
Indicates theft warning horn request signal received from BCM on CAN
THFT HRN REQ [On/Off]
commu- nication line
O
HORN CHIRP [On/Off] Indicates horn reminder signal received from BCM on CAN communication line

ACTIVE TEST P

Test item Description

HORN This test is able to check horn operation [On].
REAR DEFOGGER This test is able to check rear window defogger operation [On/Off].
FRONT WIPER This test is able to check wiper motor operation [Hi/Lo/Off].

Revision: October 2013

HAC-139 2014 Sentra NAM
 DIAGNOSIS SYSTEM (IPDM E/R) (WITHOUT INTELLIGENT KEY
SYSTEM)
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
Test item Description
MOTOR FAN This test is able to check cooling fan operation [4/3/2/1].
EXTERNAL LAMPS This test is able to check external lamp operation [Fog/Hi/Lo/TAIL/Off].

CAN DIAG SUPPORT MNTR

Refer to LAN-13, "CAN Diagnostic Support Monitor".

Revision: October 2013

HAC-140 2014 Sentra NAM
 A/C AUTO AMP.
< ECU DIAGNOSIS INFORMATION > [MANUAL AIR CONDITIONER]

ECU DIAGNOSIS INFORMATION A

A/C AUTO AMP.
Reference Value INFOID:0000000009757741
B

TERMINAL LAYOUT
C

ALIIA0579ZZ
F
PHYSICAL VALUES

G Terminal No.
Description
(Wire color)
Condition Value
Input/
+  Signal name
Output
H

ACTIVE
30 Ignition
TEST HAC
1* ECV control signal Output (HVAC
(GR) (B) switch ON
TEST:
MODE4)
J
SJIA1607E
K
0 – 4.8 V
3* 30
Intake sensor signal Input Ignition switch ON Output voltage varies with evapo-
(L) (B)
rator fin temperature

10* 30 L
Sensor ground — Ignition switch ON 0 – 0.1 V
(P) (B)
11 30
Ignition power supply Input Ignition switch ON 11 – 14 V
(LG) (B) M
12 30
Battery power supply Input Ignition switch OFF 11 – 14 V
(SB) (B)
N

• Ignition switch ON
13 30 O
Power transistor control signal Output • Blower motor: 1st speed
(V) (B)
(manual)

ZJIA0863J P

Revision: October 2013 HAC-141 2014 Sentra NAM

 A/C AUTO AMP.
< ECU DIAGNOSIS INFORMATION > [MANUAL AIR CONDITIONER]
Terminal No.
Description
(Wire color)
Condition Value
Input/
+  Signal name
Output

• Ignition switch ON
• Blower motor: OFF

14 30 JMIIA0941GB
Blower fan ON signal Output
(LG) (B)

• Ignition switch ON
• Blower motor: ON

PKIB4960J

• Ignition switch ON
• A/C switch: OFF (A/C
indi- cator: OFF)

15* 30
A/C ON signal Output
JPMIA0012GB

(Y) (B)

• Ignition switch ON
• A/C switch: ON (A/C
indi- cator: ON)

JMIIA0941GB

16 30 Defroster OFF 0V
RR DEF signal Output
(W) (B) switch ON 12 V
17 30 A/MIX
(BR) (B) drive 4
18 30 A/MIX • Ignition switch ON
(SB) (B) drive 3 Air mix door motor
• Right after the tempera-
(passenger side) Output
19 30 A/MIX ture control switch
drive signal
(LG) (B) drive 2 (pas- senger side)
operation
20 30 A/MIX
JPIIA1647GB
(L) (B) drive 1
21 30
Ignition power supply Input Ignition switch ON 11 – 14 V
(W) (B)

23* 30 A/C auto amp. connection rec-

Output Ignition switch ON 11 – 14 V
(P) (B) ognition signal

25 30 Defroster OFF 0V
RR DEF feedback Input
(R) (B) switch ON 12 V

Revision: October 2013 HAC-142 2014 Sentra NAM

 A/C AUTO AMP.
< ECU DIAGNOSIS INFORMATION > [MANUAL AIR CONDITIONER]
Terminal No.
Description
(Wire color) A
Condition Value
Input/
+  Signal name
Output
B

27 30 Communication signal (A/C con-

Input Ignition switch ON C
(LG) (B) trol  A/C auto amp.)

SJIA1522J D

E
28 30 Communication signal (A/C auto
Output Ignition switch ON
(BR) (B) amp.  A/C control)

F
SJIA1521J

30
Ground Ground — Ignition switch ON 0 – 0.1 V
(B) G
• Ignition switch ON
• Intake switch: REC  9.5 – 13.5 V
35 30 FRE H
FRE
(G) (B) • Ignition switch ON
• Intake switch: FRE  0–1V
Intake door motor REC
Output HAC
drive signal • Ignition switch ON
• Intake switch: FRE  9.5 – 13.5 V
36 30 REC
REC J
(V) (B) • Ignition switch ON
• Intake switch: REC  0–1V
FRE
37 30 MODE K
(GR) (B) drive 4
38 30 MODE
(G) (B) drive 3 • Ignition switch ON L
Mode door motor
Output • Right after the
39 30 MODE drive signal
MODE switch
(Y) (B) drive 2 operation
40 30 MODE M
(O) (B) drive 1 JPIIA1647GB

*
:With manual A/C
N

Revision: October 2013 HAC-143 2014 Sentra NAM

 ECM, IPDM E/R, BCM
< ECU DIAGNOSIS INFORMATION > [MANUAL AIR CONDITIONER]
ECM, IPDM E/R, BCM
List of ECU Reference INFOID:0000000009757742

ECU Reference
EC-77, "Reference Value"
EC-90, "Fail Safe"
ECM
EC-93, "DTC Inspection Priority Chart"
EC-94, "DTC Index"
PCS-13, "Reference Value"
IPDM E/R (with Intelligent Key system) PCS-19, "Fail-safe"
PCS-20, "DTC Index"
PCS-41, "Reference Value"
IPDM E/R (without Intelligent Key system) PCS-47, "Fail-Safe"
PCS-48, "DTC Index"
BCS-29, "Reference Value"
BCS-46, "Fail-safe"
BCM (with Intelligent Key system)
BCS-48, "DTC Inspection Priority Chart"
BCS-49, "DTC Index"
BCS-97, "Reference Value"
BCS-108, "Fail-safe"
BCM (without Intelligent Key system)
BCS-108, "DTC Inspection Priority Chart"
BCS-109, "DTC Index"

Revision: October 2013 HAC-144 2014 Sentra NAM

 MANUAL AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]

WIRING DIAGRAM A
MANUAL AIR CONDITIONING SYSTEM
Wiring Diagram INFOID:0000000009757743
B

HAC

ABIWA0377GB

Revision: October 2013

HAC-145 2014 Sentra NAM
 MANUAL AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]

ABIIA1306GB

Revision: October 2013

HAC-146 2014 Sentra NAM
 MANUAL AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]

HAC

ABIIA1307GB

Revision: October 2013 HAC-147 2014 Sentra NAM

 MANUAL AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]

ABIIA1308GB

Revision: October 2013

HAC-148 2014 Sentra NAM
 MANUAL AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]

HAC

ABIIA1309GB

Revision: October 2013 HAC-149 2014 Sentra NAM

 MANUAL AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]

ABIIA1310GB

Revision: October 2013

HAC-150 2014 Sentra NAM
 MANUAL AIR CONDITIONING SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]

HAC

ABIIA1311GB

Revision: October 2013 HAC-151 2014 Sentra NAM

 MANUAL HEATER SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]
MANUAL HEATER SYSTEM
Wiring Diagram INFOID:0000000009757744

ABIWA0378GB

Revision: October 2013 HAC-152 2014 Sentra NAM

 MANUAL HEATER SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]

HAC

ABIIA1312GB

Revision: October 2013 HAC-153 2014 Sentra NAM

 MANUAL HEATER SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]

ABIIA1313GB

Revision: October 2013

HAC-154 2014 Sentra NAM
 MANUAL HEATER SYSTEM
< WIRING DIAGRAM > [MANUAL AIR CONDITIONER]

HAC

ABIIA1314GB

Revision: October 2013 HAC-155 2014 Sentra NAM

 DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION > [MANUAL AIR CONDITIONER]

BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow INFOID:0000000009757745

DETAILED FLOW
1. LISTEN TO CUSTOMER COMPLAINT
Listen to customer complaint. Get detailed information about the conditions and environment when the symp-
tom occurs.

>> GO TO 2.
2. VERIFY THE SYMPTOM WITH OPERATIONAL CHECK
Verify the symptom with operational check. Refer to HAC-157, "Work Procedure".

>> GO TO 3.
3. GO TO APPROPRIATE TROUBLE DIAGNOSIS
Go to appropriate trouble diagnosis. Refer to HAC-181, "Symptom Table".

>> GO TO 4.
4. REPAIR OR REPLACE
Repair or replace the specific parts.

>> GO TO 5.
5. FINAL CHECK
Final check.
Is the inspection result
normal? YES >>
Inspection End.
NO >> GO TO 3.
 DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION > [MANUAL AIR CONDITIONER]
Revision: October 2013
HAC-156 2014 Sentra NAM
 OPERATION INSPECTION
< BASIC INSPECTION > [MANUAL AIR CONDITIONER]
OPERATION INSPECTION
A
Work Procedure INFOID:0000000009757746

DESCRIPTION B
The purpose of the operational check is to check that the individual system operates normally.

Check condition : Engine running at normal operating temperature. C

Check condition : Blower control dial in OFF position.
Check condition : REC off (LED extinguished).
D
Check condition : VENT selected (LED illuminated).
Check condition : DEF off (LED extinguished).
OPERATION INSPECTION E

1.CHECK BLOWER
1. Rotate the blower control dial clockwise one detent. Blower should operate on low speed. F
2. Rotate the blower control dial one detent at a time, and continue checking blower speed until all speeds
are checked.
3. Leave blower on maximum speed.
G
Is the test result normal?
YES >> GO TO 2.
NO >> Refer to HAC-174, "Diagnosis Procedure".
H
2.CHECK A/C SWITCH LED
1. Press A/C switch.
2. A/C switch indicator should turn HAC
ON. Is the test result normal?
YES >> GO TO 3.
NO >> Refer to HAC-168, "Diagnosis Procedure". J
3. CHECK A/C SWITCH
Confirm that the compressor clutch engages (sound or visual inspection).
K
Is the test result normal?
YES >> GO TO 4.
NO >> Refer to HAC-178, "Diagnosis Procedure". L
4. CHECK FRONT AIR CONTROL MODE LEDS
1. Press D/F ( ), FOOT ( ), B/L , and VENT , MAX A/C, and DEF ( ).
2. Each button indicator should illuminate. M
Is the test result normal?
YES >> GO TO 5.
NO >> Refer to HAC-160, "A/C SWITCH ASSEMBLY : Diagnosis Procedure". N

5.CHECK DISCHARGE AIR

1. Press D/F ( ), FOOT ( ), B/L , and VENT and DEF ( ). O
2. Confirm that discharge air comes out according to the air distribution table. Refer to HAC-123, "Door Con-
trol".
Is the test result normal? P
YES >> GO TO 6.
NO >> Refer to HAC-181, "Symptom Table".
6.CHECK REC LED
1. Press DEF ( ) and make sure LED is off.
2. Make sure VENT ( ) or B/L ( ) is selected.
3. Press REC ( ) switch one time. REC indicator should illuminate.

Revision: October 2013

HAC-157 2014 Sentra NAM
 OPERATION INSPECTION
< BASIC INSPECTION > [MANUAL AIR CONDITIONER]
4. Press REC ( ) switch one more time. REC indicator should go
off. Is the test result normal?
YES >> GO TO 7.
NO >> Refer to HAC-160, "A/C SWITCH ASSEMBLY : Diagnosis Procedure".
7.CHECK INTAKE DOOR OPERATION
1. Press REC ( ) switch one time. REC indicator should illuminate.
2. Listen to the sound of the air coming out of the vent.
3. Press REC ( ) switch one more time. REC indicator should go off.
4. There should be an audible change to the sound of the air flowing out of the
vent. Is the test result normal?
YES >> GO TO 8.
NO >> Refer to HAC-165, "Diagnosis Procedure".
8.CHECK TEMPERATURE DECREASE
1. Press A/C switch.
2. Rotate temperature control dial counterclockwise until maximum cold.
3. Check for cold air at selected discharge air
outlets. Is the test result normal?
YES >> GO TO 9.
NO >> Refer to HAC-182, "Component Function Check".
9.CHECK TEMPERATURE INCREASE
1. Rotate temperature control dial clockwise until maximum hot.
2. Check for hot air at appropriate discharge air
outlets. Is the test result normal?
YES >> Inspection End.
NO >> Refer to HAC-184, "Component Function Check".

Revision: October 2013

HAC-158 2014 Sentra NAM
 POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]

DTC/CIRCUIT DIAGNOSIS A
POWER SUPPLY AND GROUND CIRCUIT
A/C AUTO AMP.
B
A/C AUTO AMP. : Diagnosis Procedure INFOID:0000000009757747

C
Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram" or HAC-152, "Wiring Diagram".

D
1. CHECK FUSE
Check fuses [No. 5, 8 and 21, located in the fuse block (J/B)].
NOTE: E
Refer to PG-47, "Terminal Arrangement".
Is the inspection result normal?
YES >> GO TO 2. F
NO >> Replace the blown fuse after repairing the affected circuit.
2. CHECK A/C AUTO AMP. POWER SUPPLY
G
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check voltage between A/C auto amp. harness connector and ground.
H
+ Voltage
A/C auto amp.  Ignition switch position
HAC
Connector Terminal OFF ACC ON
11 Approx. 0 V Approx. 0 V Battery voltage
M33 (with manual A/C)
12 Ground Battery voltage Battery voltage Battery voltage J
M29 (without A/C)
21 Approx. 0 V Battery voltage Battery voltage
Is the inspection result normal?
K
YES >> GO TO 3.
NO >> Repair harness or connector between A/C auto amp. and fuse block (J/B).
3.CHECK A/C AUTO AMP. GROUND CIRCUIT L
1. Turn ignition switch OFF.
2. Check continuity between A/C auto amp. harness connector and ground.
M
A/C auto amp.
— Continuity
Connector Terminal
M33 (with manual A/C) N
30 Ground Yes
M29 (without A/C)

Is the inspection result normal? O

YES >> Inspection End.
NO >> Repair harness or connector.
A/C SWITCH ASSEMBLY P
A/C SWITCH ASSEMBLY : Component Function Check INFOID:0000000009757748

1.CHECK OPERATION
1. Press the ON switch.
2. Operate the temperature control switch. Check that the fan speed or outlet
changes. Does it operate normally?
Revision: October 2013
HAC-159 2014 Sentra NAM
 POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
YES >> Inspection End.
NO >> Perform trouble diagnosis for the A/C switch assembly. Refer to HAC-160, "A/C SWITCH
ASSEMBLY : Diagnosis Procedure".
A/C SWITCH ASSEMBLY : Diagnosis Procedure INFOID:0000000009757749

Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram" or HAC-152, "Wiring Diagram".

1.CHECK A/C SWITCH ASSEMBLY POWER SUPPLY

1. Disconnect the A/C switch assembly connector.
2. Turn ignition switch ON.
3. Check voltage between A/C switch assembly harness connector and ground.

(+)
A/C switch assembly Voltage
()
(Approx.)
Connector Terminal
M51 1 Ground Battery voltage

Is the inspection result

normal? YES >> GO
TO 3.
NO >> GO TO 2.
2.CHECK FUSE
Check 10A fuse [No.5, located in the fuse block (J/B)].
NOTE:
Refer to PG-47, "Terminal Arrangement".
Is the inspection result normal?
YES >> Check harness for open circuit. Repair or replace if necessary.
NO >> Check harness for short circuit. Repair or replace if necessary.
3.CHECK A/C SWITCH ASSEMBLY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between A/C switch assembly harness connector and ground.

A/C switch assembly

— Continuity
Connector Terminal
M51 9 Ground Yes
Is the inspection result normal?
YES >> Replace the A/C switch assembly. Refer to HAC-188, "Removal and
Installation". NO >> Repair the harnesses or connectors.

Revision: October 2013

 POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-160 2014 Sentra
NAM
 MODE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
MODE DOOR MOTOR
A
Diagnosis Procedure INFOID:0000000009757750

B
Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram" or HAC-152, "Wiring Diagram".

C
1.CHECK MODE DOOR MOTOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect mode door motor connector. D
3. Turn ignition switch ON.
4. Check voltage between mode door motor harness connector and ground.
E
+
Mode door motor  Voltage
Connector Terminal F
M126 5 Ground Battery voltage

Is the inspection result normal?

YES >> GO TO 2. G
NO >> Repair harness or connector between mode door motor and fuse.
2.CHECK MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN H
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between mode door motor harness connector and A/C auto amp. harness connector. HAC

Mode door motor A/C auto amp.

Continuity
Connector Terminal Connector Terminal J
4 37
3 M33 (with manual A/C) 38
M126
2 M29 (without A/C) 39
Yes K
1 40

Is the inspection result normal? L

YES >> GO TO 3.
NO >> Repair harness or connector.
3. CHECK MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT M

Check continuity between mode door motor harness connector and A/C auto amp. harness connector.
N
Mode door motor
— Continuity
Connector Terminal
4 O
3
M126 Ground No
2
1 P

Is the inspection result

normal? YES >> GO
TO 4.
NO >> Repair harness or connector.
4. CHECK MODE DOOR MOTOR
Check mode door motor. Refer to HAC-162, "Component Inspection".

Revision: October 2013

 MODE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-161
2014 Sentra
NAM
 MODE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-189, "Removal and Installation".
NO >> Replace mode door motor. Refer to HAC-193, "MODE DOOR MOTOR : Removal and Installa-
tion".
Component Inspection INFOID:0000000009757751

1.CHECK MODE DOOR MOTOR

1. Remove mode door motor. Refer to HAC-193, "MODE DOOR MOTOR : Removal and Installation".
2. Check resistance between mode door motor terminals. Refer to applicable table for the normal value.

Resistance ()
Terminal
(Approx.)
1
2
5 90
3
4
Is the inspection result
normal? YES >>
Inspection End.
NO >> Replace mode door motor. Refer to HAC-193, "MODE DOOR MOTOR : Removal and Installa-
tion".

Revision: October 2013

 MODE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-162 2014 Sentra
NAM
 AIR MIX DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
AIR MIX DOOR MOTOR
A
Diagnosis Procedure INFOID:0000000009757752

B
Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram" or HAC-152, "Wiring Diagram".

C
1.CHECK AIR MIX DOOR MOTOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect air mix door motor connector. D
3. Turn ignition switch ON.
4. Check voltage between air mix door motor harness connector and ground.
E
+
Air mix door motor  Voltage
Connector Terminal F
M127 5 Ground Battery voltage

Is the inspection result normal?

YES >> GO TO 2. G
NO >> Repair harness or connector between air mix door motor and fuse.
2.CHECK AIR MIX DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN H
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between air mix door motor harness connector and A/C auto amp. harness connector. HAC

Air mix door motor A/C auto amp.

Continuity
Connector Terminal Connector Terminal J
1 34
2 M33 (with manual A/C) 33
M127
3 M29 (without A/C) 32
Yes K
4 31

Is the inspection result normal? L

YES >> GO TO 3.
NO >> Repair harness or connector.
3. CHECK AIR MIX DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT M

Check continuity between air mix door motor harness connector and A/C auto amp. harness connector.
N
Air mix door motor
— Continuity
Connector Terminal
1 O
2
M127 Ground No
3
4 P

Is the inspection result

normal? YES >> GO
TO 4.
NO >> Repair harness or connector.
4. CHECK AIR MIX DOOR MOTOR
Check air mix door motor. Refer to HAC-164, "Component Inspection".

Revision: October 2013

 AIR MIX DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-163
2014 Sentra
NAM
 AIR MIX DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-189, "Removal and Installation".
NO >> Replace air mix door motor. Refer to HAC-193, "AIR MIX DOOR MOTOR : Removal and
Installa- tion".
Component Inspection INFOID:0000000009757753

1.CHECK AIR MIX DOOR MOTOR

1. Remove air mix door motor. Refer to HAC-193, "AIR MIX DOOR MOTOR : Removal and Installation".
2. Check resistance between air mix door motor terminals. Refer to applicable table for the normal value.

Resistance ()
Terminal
(Approx.)
1
2
5 90
3
4
Is the inspection result
normal? YES >>
Inspection End.
NO >> Replace air mix door motor. Refer to HAC-193, "AIR MIX DOOR MOTOR : Removal and Installa-
tion".

Revision: October 2013

 AIR MIX DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-164 2014 Sentra
NAM
 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
INTAKE DOOR MOTOR
A
Diagnosis Procedure INFOID:0000000009757754

B
Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram" or HAC-152, "Wiring Diagram".

C
1.CHECK INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch ON.
2. Operate intake switch and check by operation sound that intake door motor operates. D
Does the intake door motor operate?
YES >> Refer to GI-39, "Intermittent Incident".
NO >> GO TO 2. E
2.CHECK INTAKE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
F
2. Disconnect intake door motor connector, and A/C auto amp. connector.
3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

G
Intake door motor A/C auto amp.
Continuity
Connector Terminal Connector Terminal
2 M33 (with manual A/C) 35
M48 Yes H
6 M29 (without A/C) 36

Is the inspection result

normal? YES >> GO HAC
TO 3.
NO >> Repair harness or connector.
3. CHECK INTAKE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT
J
Check continuity between intake door motor harness connector and ground.

Intake door motor K

— Continuity
Connector Terminal
2
M48 Ground No L
6

Is the inspection result normal?

YES >> GO TO 4. M
NO >> Repair harness or connector.
4. CHECK INTAKE DOOR MOTOR
1. Turn ignition switch OFF. N
2. Check intake door motor. Refer to HAC-166, "Component Inspection
(Motor)". Is the inspection result normal?
YES >> GO TO 5. O
NO >> Replace intake door motor. Refer to HAC-193, "INTAKE DOOR MOTOR : Removal and Installa-
tion".
5.CHECK INSTALLATION OF INTAKE DOOR MOTOR SYSTEM P

Check intake door motor system is properly installed. Refer to HAC-192, "Exploded View".
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-189, "Removal and
Installation". NO >> Repair or replace malfunctioning parts.
 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
Revision: October 2013
HAC-165 2014 Sentra NAM
 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
Component Inspection (Motor) INFOID:0000000009757755

1.CHECK INTAKE DOOR MOTOR

Supply intake door motor terminals with battery voltage and check by visually and operation sound that intake
door motor operates.

Terminal
Operation direction
+ 
2 6 FRE
6 2 REC

Is the inspection result

normal? YES >>
Inspection ENd.
NO >> Replace intake door motor. Refer to HAC-193, "INTAKE DOOR MOTOR : Removal and Installa-
tion".

Revision: 2013
October
 INTAKE DOOR MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-166
2014 Sentra
NAM
 A/C SWITCH ASSEMBLY SIGNAL CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
A/C SWITCH ASSEMBLY SIGNAL CIRCUIT
A
Diagnosis Procedure INFOID:0000000009757756

B
Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram" or HAC-152, "Wiring Diagram".

C
1.CHECK RX (A/C SWITCH ASSEMBLY  A/C AUTO AMP.) CIRCUIT CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect the A/C switch assembly and the A/C auto amp. connectors. D
3. Check continuity between A/C switch assembly harness connector and A/C auto amp. harness connector.

A/C switch assembly A/C auto amp. E

Continuity
Connector Terminal Connector Terminal
M33 (with manual A/C)
M51 5 27 Yes
M29 (without A/C) F

4. Check continuity between A/C switch assembly harness connector M51 terminal 5 and ground.
G
A/C switch assembly
— Continuity
Connector Terminal
M51 5 Ground No H
Is the inspection result
normal? YES >> GO
HAC
TO 2.
NO >> Repair harness or connector.
2.CHECK TX (A/C AUTO AMP.  A/C SWITCH ASSEMBLY) CIRCUIT CONTINUITY
1. Check continuity between A/C switch assembly harness connector and A/C auto amp. harness connector. J

A/C switch assembly A/C auto amp.

Continuity K
Connector Terminal Connector Terminal
M33 (with manual A/C)
M51 13 28 Yes
M29 (without A/C)
L
2. Check continuity between A/C switch assembly harness connector M79 terminal 9 and ground.

A/C switch assembly M

— Continuity
Connector Terminal
M51 13 Ground No
N
Is the inspection result normal?
YES >> Perform trouble diagnosis for the A/C switch assembly. Refer to HAC-160, "A/C SWITCH
ASSEMBLY : Diagnosis Procedure".
O
NO >> Repair harness or connector.

Revision: 2013
October
 A/C SWITCH ASSEMBLY SIGNAL CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-167
2014 Sentra
NAM
 A/C ON SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
A/C ON SIGNAL
Component Function Check INFOID:0000000009757757

1.CHECK A/C ON SIGNAL

With CONSULT
1. Turn ignition switch ON.
2. Operate blower motor.
3. Select “AIR CONDITIONER” of “BCM” using CONSULT.
4. Select “AIR COND SW” in “DATA MONITOR” mode.
5. Check A/C ON signal when the A/C switch is operated.

Monitor item Condition Status

ON (A/C indicator:
On
ON)
AIR COND SW A/C switch
OFF (A/C indicator:
Off
OFF)
Is the inspection result
normal? YES >>
Inspection End.
NO >> Refer to HAC-168, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000009757758

Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram".

1.CHECK A/C ON SIGNAL

1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Turn ignition switch ON.
4. Check output waveform between A/C auto amp. harness connector and ground with using oscilloscope.

+
A/C auto amp.  Output waveform
Connector Terminal

M33 15 Ground

JPMIA0012GB

Is the inspection result normal?

YES >> Replace A/C auto amp. Refer to HAC-189, "Removal and
Installation". NO >> GO TO 2.
2.CHECK A/C ON SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between A/C auto amp. harness connector and BCM harness connector.

Revision: October 2013

 A/C ON SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-168 2014 Sentra
NAM
 A/C ON SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]

A/C auto amp. BCM A

Continuity
Connector Terminal Connector Terminal
M21 (without Intelligent Key system)
M33 15 27 Yes B
M84 (with Intelligent Key system)

Is the inspection result normal?

YES >> GO TO 3. C
NO >> Repair harness or connector.
3.CHECK A/C ON SIGNAL CIRCUIT FOR SHORT
D
Check continuity between A/C auto amp. harness connector and ground.

A/C auto amp.

— Continuity E
Connector Terminal
M33 15 Ground No

Is the inspection result normal? F

YES >> Replace BCM. Refer to BCS-73, "Removal and Installation" (with Intelligent Key system) or
BCS- 126, "Removal and Installation" (without Intelligent Key system).
NO >> Repair harness or connector. G

HAC

Revision: October 2013 HAC-169 2014 Sentra NAM

 INTAKE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
INTAKE SENSOR
Diagnosis Procedure INFOID:0000000009757759

Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram".

1.CHECK INTAKE SENSOR POWER SUPPLY

1. Turn ignition switch OFF.
2. Disconnect intake sensor connector.
3. Turn ignition switch ON.
4. Check voltage between intake sensor harness connector and ground.

+
Intake sensor Voltage

(Approx.)
Connector Terminal
M68 1 Ground 5V
Is the inspection result
normal? YES >> GO
TO 2.
NO >> GO TO 4.
2.CHECK INTAKE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between intake sensor harness connector and ground.

Intake sensor
— Continuity
Connector Terminal
M68 2 Ground Yes
Is the inspection result
normal? YES >> GO
TO 3.
NO >> Repair harness or connector.
3. CHECK INTAKE SENSOR
Check intake sensor. Refer to HAC-171, "Component Inspection".
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-189, "Removal and Installation".
NO >> Replace intake sensor. Refer to HAC-190, "Removal and Installation".
4.CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between intake sensor harness connector and A/C auto amp. harness connector.

Intake sensor A/C auto amp.

Continuity
Connector Terminal Connector Terminal
M68 1 M33 3 Yes
Is the inspection result
normal? YES >> GO
TO 5.
NO >> Repair harness or connector.
5. CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND
Check continuity between intake sensor harness connector and ground.
 INTAKE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]

Revision: October 2013

HAC-170 2014 Sentra NAM
 INTAKE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]

Intake sensor A
— Continuity
Connector Terminal
M68 1 Ground No
B
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair harness or connector. C
6. CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO VOLTAGE
1. Turn ignition switch ON.
2. Check voltage between intake sensor harness connector and ground. D

+
E Voltage
Intake sensor 
(Approx.)
Connector Terminal
M68 1 Ground 0V
F
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-189, "Removal and
Installation". NO >> Repair harness or connector. G
Component Inspection INFOID:0000000009757760

1.CHECK INTAKE SENSOR H

1. Turn ignition switch OFF.

2. Disconnect intake sensor connector.
HAC
3. Check resistance between intake sensor terminals.

Condition
Terminal Resistance: k J
Temperature: C (F)
15 (5) 17.73
10 (14) 13.46 K
5 (23) 10.33
0 (32) 8.00
5 (41) 6.25 L
10 (50) 4.93
15 (59) 3.92
1 2 M
20 (68) 3.14
25 (77) 2.54
30 (86) 2.06
N
35 (95) 1.69
40 (104) 1.39
45 (113) 1.15
O
Is the inspection result
normal? YES >>
Inspection End. P
NO >> Replace intake sensor. Refer to HAC-190, "Removal and Installation".

Revision: October 2013

HAC-171 2014 Sentra NAM
 BLOWER FAN ON SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
BLOWER FAN ON SIGNAL
Component Function Check INFOID:0000000009757761

1.CHECK BLOWER FAN ON SIGNAL

With CONSULT
1. Turn ignition switch ON.
2. Select “AIR CONDITIONER” of “BCM” using CONSULT.
3. Select “FAN ON SIG” in “DATA MONITOR” mode.
4. Check blower fan ON signal when the fan control dial is operated.

Monitor item Condition Status

ON On
FAN ON SIG Blower motor
OFF OFF
Is the inspection result
normal? YES >>
Inspection End.
NO >> Refer to HAC-172, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000009757762

Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram" or HAC-152, "Wiring Diagram".

1.CHECK BLOWER FAN ON SIGNAL

1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. harness connector.
3. Turn ignition switch ON.
4. Check output waveform between A/C auto amp. and ground with using oscilloscope.

+
A/C auto amp.  Output waveform
Connector Terminal

M33 (with manual A/C)

14 Ground
M29 (without A/C)

PKIB4960J

Is the inspection result normal?

YES >> Replace A/C auto amp. Refer to HAC-189, "Removal and
Installation". NO >> GO TO 2.
2.CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity A/C auto amp. harness connector and BCM harness connector.

A/C auto amp. BCM

Continuity
Connector Terminal Connector Terminal
M33 (with manual A/C) M21 (without Intelligent Key system)
14 28 Yes
M29 (without A/C) M84 (with Intelligent Key system)

Revision: October 2013

HAC-172 2014 Sentra NAM
 BLOWER FAN ON SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
Is the inspection result normal?
YES >> GO TO 3. A
NO >> Repair harness or connector.
3. CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR SHORT
B
Check continuity between A/C auto amp. harness connector and ground.

A/C auto amp. C

— Continuity
Connector Terminal
M33 (with manual A/C)
14 Ground No
M29 (without A/C) D

Is the inspection result normal?

YES >> Replace BCM. Refer to BCS-73, "Removal and Installation" (with Intelligent Key system) or BCS- E
126, "Removal and Installation" (without Intelligent Key system).
NO >> Repair harness or connector.

HAC

Revision: October 2013 HAC-173 2014 Sentra NAM

 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
BLOWER MOTOR
Diagnosis Procedure INFOID:0000000009757763

Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram" or HAC-152, "Wiring Diagram".

1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check following fuses.
- 10A fuse [No. 21, located in fuse block (J/B)]
- 15A fuses [Nos. 20 and 22, located in fuse block (J/B)]
NOTE:
Refer to PG-47, "Terminal Arrangement".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit.
2.CHECK BLOWER MOTOR POWER SUPPLY
1. Disconnect blower motor connector.
2. Turn ignition switch ON.
3. Check voltage between blower motor harness connector and ground.

+
Blower motor  Voltage
Connector Terminal
M62 1 Ground Battery voltage
Is the inspection result
normal? YES >> GO
TO 4.
NO >> GO TO 3.
3.CHECK BLOWER RELAY
1. Turn ignition switch OFF.
2. Check blower relay. Refer to HAC-177, "Component Inspection (Blower Motor
Relay)". Is the inspection result normal?
YES >> Repair harness or connector between blower motor and
fuse. NO >> Replace blower relay.
4.CHECK BLOWER MOTOR CONTROL CIRCUIT
1. Turn ignition switch OFF.
2. Connect blower motor connector.
3. Disconnect variable blower control connector.
4. Turn ignition switch ON.
5. Check voltage between variable blower control harness connector and ground.

+
Variable blower control  Voltage
Connector Terminal
M52 1 Ground Battery voltage
Is the inspection result
normal? YES >> GO
TO 6.
NO >> GO TO 5.
5.CHECK BLOWER MOTOR CONTROL CIRCUIT FOR OPEN
Revision: October 2013
 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-174
2014 Sentra
NAM
 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
1. Turn ignition switch OFF.
2. Disconnect blower motor connector. A
3. Check continuity between variable blower control harness connector and blower motor harness connec-
tor.
B
Variable blower control Blower motor
Continuity
Connector Terminal Connector Terminal
M52 1 M62 2 Existed C
Is the inspection result normal?
YES >> Replace blower motor. Refer to VTL-10, "Removal and Installation".
D
NO >> Repair harness or connector.
6.CHECK A/C AUTO AMP. IGNITION POWER SUPPLY
1. Turn ignition switch OFF. E
2. Disconnect A/C auto amp.
3. Turn ignition switch ON.
4. Check voltage between A/C auto amp. harness connector and ground.
F
+
A/C auto amp.  Voltage G
Connector Terminal
M33 (with manual A/C)
21 Ground Battery voltage
M29 (without A/C) H

Is the inspection result

normal? YES >> GO HAC
TO 7.
NO >> Repair harness or connector between A/C auto amp. and fuse.
7. CHECK VARIABLE BLOWER CONTROL IGNITION POWER SUPPLY
Check voltage between variable blower control harness connector and ground. J

+
K
Variable blower control  Voltage
Connector Terminal
M52 4 Ground Battery voltage L
Is the inspection result
normal? YES >> GO
TO 8.
NO >> Repair harness or connector between variable blower control and fuse. M
8. CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT FOR OPEN
1. Turn ignition switch OFF. N
2. Check continuity between variable blower control harness connector and ground.

Variable blower control

— Continuity O
Connector Terminal
M52 3 Ground Yes

Is the inspection result normal? P

YES >> GO TO 9.
NO >> Repair harness or connector.
9.CHECK VARIABLE BLOWER CONTROL CONTROL SIGNAL
1. Connect variable blower control connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Set air outlet to VENT.
 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
Revision: October 2013
HAC-175 2014 Sentra NAM
 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
4. Change fan speed from 1st – 7th, and check duty ratios between variable blower control harness
connec- tor and ground by using an oscilloscope.
NOTE:
Calculate the drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms

+
 Condition
Variable blower control Duty ratio
Output waveform
Fan speed (manual) (Approx.)
Connector Terminal
Air outlet: VENT
1st 26%
2nd 34%
3rd 41%

M52 2 Ground 4th 51%

5th 62%
6th 73%
7th 82% JPIIA1646GB

Is the inspection result normal?

YES >> Replace variable blower control. Refer to HAC-194, "Removal and
Installation". NO >> GO TO 10.
10.CHECK VARIABLE BLOWER CONTROL CONTROL SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect variable blower control connector and A/C auto amp. connector.
3. Check continuity between variable blower control harness connector and A/C auto amp. harness
connec- tor.

Variable blower control A/C auto amp.

Continuity
Connector Terminal Connector Terminal
M33 (with manual A/C)
M52 2 13 Yes
M29 (without A/C)
Is the inspection result
normal? YES >> GO
TO 11.
NO >> Repair harness or connector.
11.CHECK VARIABLE BLOWER CONTROL CONTROL SIGNAL CIRCUIT FOR SHORT
Check continuity between variable blower control harness connector and ground.

Variable blower control

— Continuity
Connector Terminal
M52 2 Ground No
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-189, "Removal and
Installation". NO >> Repair harness or connector.
Component Inspection (Blower Motor) INFOID:0000000009757764

1.CHECK BLOWER MOTOR

1. Connect battery voltage to terminal 1 of blower motor.
2. Connect ground to terminal 2 of blower
motor. Does the blower fan operate?
YES >> Intermittent incident. Refer to GI-39, "Intermittent Incident".

Revision: October 2013 HAC-176 2014 Sentra NAM

 BLOWER MOTOR
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
NO >> Replace blower motor. Refer to VTL-10, "Removal and Installation".
A
Component Inspection (Blower Motor Relay) INFOID:0000000009757765

1.CHECK BLOWER RELAY

B
1. Turn ignition switch OFF.
2. Remove blower motor relay.
3. Check continuity between blower motor relay terminals 3 and 5
C
when voltage is supplied between terminals 1 and 2.

Terminals Voltage Continuity

D
ON Yes
3 5
OFF No

Is the inspection result normal? E

YES >> Inspection End.
NO >> Replace blower motor relay.
JSIIA1551ZZ
F

HAC

Revision: October 2013 HAC-177 2014 Sentra NAM

 MAGNET CLUTCH
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
MAGNET CLUTCH
Component Function Check INFOID:0000000009757766

1.CHECK MAGNET CLUTCH OPERATION

Perform auto active test of IPDM E/R. Refer to PCS-9, "Diagnosis Description" (with Intelligent Key system) or
PCS-37, "Diagnosis Description" (without Intelligent Key system).
Does it operate normally?
YES >> Inspection End.
NO >> Refer to HAC-178, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000009757767

Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram".

1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 10A fuse (No. 39, located in IPDM E/R).
NOTE:
Refer to PG-49, "IPDM E/R Terminal Arrangement".
Is the inspection result
normal? YES >> GO
TO 2.
NO >> Replace the blown fuse after repairing the affected circuit.
2.CHECK MAGNET CLUTCH POWER SUPPLY CIRCUIT
1. Disconnect compressor connector and IPDM E/R connector.
2. Check continuity between compressor harness connector and IPDM E/R harness connector.

Compressor IPDM E/R

Continuity
Connector Terminal Connector Terminal
F3 1 E43 12 Yes

Is the inspection result

normal? YES >> GO
TO 3.
NO >> Repair harness or connector.
3. CHECK MAGNET CLUTCH GROUND CIRCUIT
1. Disconnect compressor connector.
2. Check continuity between compressor harness connector and ground.

Compressor
Continuity
Connector Terminal
F3 2 Ground Yes

Is the inspection result

normal? YES >> GO
TO 4.
NO >> Repair harness or connector.
4.CHECK MAGNET CLUTCH
Directly apply battery voltage to the magnet clutch. Check operation visually and by sound.
Does it operate normally?
YES >> Replace IPDM E/R. Refer to PCS-30, "Removal and Installation" (with Intelligent Key system) or
PCS-58, "Removal and Installation" (without Intelligent Key system).
 MAGNET CLUTCH
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
NO >> Replace magnet clutch. Refer to HA-31, "MAGNET CLUTCH : Removal and Installation".

Revision: October 2013

HAC-178 2014 Sentra NAM
 ECV (ELECTRICAL CONTROL VALVE)
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
ECV (ELECTRICAL CONTROL VALVE)
A
Diagnosis Procedure INFOID:0000000009757768

B
Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram".

C
1.CHECK ECV (ELECTRICAL CONTROL VALVE) POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect compressor connector. D
3. Turn ignition switch ON.
4. Check voltage between compressor harness connector and ground.
E
+
Compressor  Voltage
Connector Terminal F
F10 3 Ground Battery voltage

Is the inspection result normal?

YES >> GO TO 3. G
NO >> GO TO 2.
2.CHECK FUSE H
1. Turn ignition switch OFF.
2. Check 10 A fuse [No. 5, located in fuse block (J/B)]. Refer to PG-47, "Terminal
Arrangement" Is the inspection result normal? HAC
YES >> Repair harness or connector.
NO >> Replace the blown fuse after repairing the affected circuit.
3. CHECK ECV CONTROL SIGNAL CIRCUIT FOR OPEN J

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.
K
3. Check continuity between compressor harness connector and A/C auto amp. harness connector.

Compressor A/C auto amp.

Continuity L
Connector Terminal Connector Terminal
F10 4 M33 1 Yes

Is the inspection result normal? M

YES >> GO TO 4.
NO >> Repair harness or connector.
4. CHECK ECV CONTROL SIGNAL CIRCUIT FOR SHORT N

Check continuity between compressor harness connector and ground.

O
Compressor
— Continuity
Connector Terminal
F10 4 Ground No P
Is the inspection result
normal? YES >> GO
TO 5.
NO >> Repair harness or connector.
5. CHECK ECV
Check ECV. Refer to HAC-180, "Component Inspection".

Revision: October 2013

 ECV (ELECTRICAL CONTROL VALVE)
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-179 2014 Sentra
NAM
 ECV (ELECTRICAL CONTROL VALVE)
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]
Is the inspection result
normal? YES >> GO
TO 6.
NO >> Replace compressor. Refer to HA-31, "COMPRESSOR : Removal and Installation".
6. CHECK INTERMITTENT INCIDENT
Refer to GI-39, "Intermittent Incident".
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to HAC-189, "Removal and
Installation". NO >> Repair or replace malfunctioning parts.
Component Inspection INFOID:0000000009757769

1.CHECK ECV (ELECTRICAL CONTROL VALVE)

1. Turn ignition switch OFF.
2. Disconnect compressor connector.
3. Check continuity between compressor connector F88 terminals.

Condition
Terminals Resistance (k)
Temperature: C (F)
3 4 20 (68) 10.1 – 11.1

Is the inspection result

normal? YES >>
Inspection End.
NO >> Replace compressor. Refer to HA-31, "COMPRESSOR : Removal and Installation".
 ECV (ELECTRICAL CONTROL VALVE)
< DTC/CIRCUIT DIAGNOSIS > [MANUAL AIR CONDITIONER]

Revision: October 2013 HAC-180 2014 Sentra NAM

 HEATER AND AIR CONDITIONING SYSTEM CONTROL
SYMPTOMS
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]

SYMPTOM DIAGNOSIS A
HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS
Symptom Table INFOID:0000000009757770
B

SYMPTOM TABLE
C
Symptom Reference Page
HAC-160, "A/C
SWITCH ASSEM-
A/C system does not come on. Go to Trouble Diagnosis Procedure for A/C System.
BLY : Diagnosis Pro- D
cedure"
Air outlet does not change. HAC-161, "Diagno-
Go to Trouble Diagnosis Procedure for Mode Door Motor E
Mode door motor does not operate normally. sis Procedure"

Discharge air temperature does not change.

HAC-163, "Diagno-
Air mix door motor does not operate normal- Go to Trouble Diagnosis Procedure for Air Mix Door Motor sis Procedure" F
ly.
Intake door does not change. HAC-165, "Diagno-
Go to Trouble Diagnosis Procedure for Intake Door Motor
Intake door motor does not operate sis Procedure"
G
normally.
HAC-174, "Diagno-
Blower motor operation is malfunctioning. Go to Trouble Diagnosis Procedure for Blower Motor.
sis Procedure"
HAC-178, "Compo-
H
Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch. nent Function
Check"
HAC-182, "Compo- HAC
Insufficient cooling Go to Trouble Diagnosis Procedure for Insufficient Cooling. nent Function
Check"
HAC-184, "Compo- J
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating. nent Function
Check"
HA-20, "Symptom
Noise Go to Trouble Diagnosis Procedure for Noise.
Table" K

Revision: October 2013 HAC-181 2014 Sentra NAM

 INSUFFICIENT COOLING
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]
INSUFFICIENT COOLING
Component Function Check INFOID:0000000009757771

SYMPTOM: Insufficient cooling

INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE
1. Press the A/C switch.
2. Turn temperature control dial counterclockwise to maximum cold.
3. Check for cold air at discharge air
outlets. Can a symptom be duplicated?
YES >> GO TO
3 NO >> GO TO 2
2. CHECK FOR ANY SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to HAC-157, "Work Procedure".
Does another symptom exist?
YES >> Refer to HAC-181, "Symptom
Table". NO >> System OK.
3. CHECK FOR SERVICE
BULLETINS Check for any service
bulletins.

>> GO TO 4
4. CHECK DRIVE BELTS
Check A/C compressor belt tension. Refer to EM-16, "Inspection".
Is the inspection result normal?
YES >> GO TO 5
NO >> Adjust or replace compressor belt. Refer to EM-16, "Adjustment".
5. CHECK AIR MIX DOOR MOTOR OPERATION
Check and verify air mix door mechanism for smooth operation.
Does air mix door operate correctly?
YES >> GO TO 6
NO >> Check air mix door motor circuit. Refer to HAC-163, "Diagnosis Procedure".
6. CHECK COOLING FAN MOTOR OPERATION
Check and verify cooling fan motor for smooth operation.
Does cooling fan motor operation correctly?
YES >> GO TO 7
NO >> Check cooling fan motor. Refer to EC-463, "Component Function Check".
7. CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE
Check recovery/recycling equipment before connecting to vehicle. Verify there is no pressure in the recovery/
recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines.

>> GO TO 8
8. CHECK REFRIGERANT PURITY
1. Connect recovery/recycling equipment to vehicle.
2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant
identifier. Is the inspection result normal?
YES >> GO TO 9
NO >> Check contaminated refrigerant. Refer to HA-21, "Description".
 INSUFFICIENT COOLING
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]
Revision: October 2013
HAC-182 2014 Sentra NAM
 INSUFFICIENT COOLING
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]
9. CHECK REFRIGERANT PRESSURE
A
Check refrigerant pressure with manifold gauge connected. Refer to HA-28, "Inspection".
Is the inspection result normal?
YES >> Perform diagnostic work flow. Refer to HA-15, "Workflow". B
NO >> GO TO 10
10. CHECK FOR EVAPORATOR FREEZE UP
C
Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES >> Perform diagnostic work flow. Refer HA-15, "Workflow". D
NO >> GO TO 11
11. CHECK AIR DUCTS
Check ducts for air leaks. E
Is the inspection result
normal? YES >>
System OK.
NO >> Repair air leaks. F

HAC

Revision: 2013
October
 INSUFFICIENT COOLING
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]
HAC-183
2014 Sentra
NAM
 INSUFFICIENT HEATING
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]
INSUFFICIENT HEATING
Component Function Check INFOID:0000000009757772

SYMPTOM: Insufficient heating

INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE
1. Turn temperature control dial clockwise to maximum heat.
2. Check for hot air at discharge air
outlets. Can a symptom be duplicated?
YES >> GO TO
3 NO >> GO TO
2
2. CHECK FOR ANY SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to HAC-157, "Work Procedure".
Does another symptom exist?
YES >> Refer to HAC-181, "Symptom
Table". NO >> System OK.
3. CHECK FOR SERVICE
BULLETINS Check for any service
bulletins.

>> GO TO 4
4. CHECK ENGINE COOLING SYSTEM
1. Check for proper engine coolant level. Refer to CO-11, "System Inspection".
2. Check hoses for leaks or kinks.
3. Check radiator cap. Refer to CO-11, "System Inspection".
4. Check for air in cooling system.

>> GO TO 5
5. CHECK AIR MIX DOOR MOTOR OPERATION
Check and verify air mix door mechanism for smooth operation.
Does air mix door operate correctly?
YES >> GO TO 6
NO >> Check the air mix door motor circuit. Refer to HAC-163, "Diagnosis Procedure".
6. CHECK AIR DUCTS
Check for disconnected or leaking air ducts.
Is the inspection result normal?
YES >> GO TO 7
NO >> Repair all disconnected or leaking air ducts.
7. CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be
warm.
Is the inspection result
normal? YES >> GO
TO 8
NO >> Both hoses warm: GO TO 9
8. CHECK ENGINE COOLANT SYSTEM
Check thermostat operation. Refer to CO-23, "Inspection".
 INSUFFICIENT HEATING
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]
Is the inspection result normal?

Revision: October 2013

HAC-184 2014 Sentra NAM
 INSUFFICIENT HEATING
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]
YES >> System OK.
NO >> Repair or replace as necessary. A
9. CHECK HEATER HOSES
Check heater hoses for proper installation.
B
Is the inspection result normal?
YES >> System OK.
NO >> 1. Back flush heater core.
C
2. Drain the water from the system.
3. Refill system with new engine coolant. Refer to CO-12, "Changing Engine Coolant".
4. To retest GO TO 10
10. CHECK HEATER HOSE TEMPERATURES D

1. Start engine and warm up to normal operating temperature.

2. Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be E
warm
Is the inspection result normal?
YES >> System OK. F
NO >> Replace heater core. Refer to HA-44, "HEATER CORE : Removal and Installation".

HAC

Revision: October 2013 HAC-185 2014 Sentra NAM

 COMPRESSOR DOES NOT OPERATE
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]
COMPRESSOR DOES NOT OPERATE
Description INFOID:0000000009757773

Symptom: Compressor does not operate.

Diagnosis Procedure INFOID:0000000009757774

NOTE:
• Perform self-diagnoses with CONSULT before performing symptom diagnosis. If DTC is detected, perform
the corresponding diagnosis.
• Check that refrigerant system is properly charged. If refrigerant amount is below the proper amount,
perform inspection of refrigerant leakage.
1. CHECK MAGNET CLUTCH OPERATION
Check magnet clutch. Refer to HAC-178, "Component Function Check".
Does it operate normally?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning parts.
2. CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to EC-465, "Component Function Check".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace malfunctioning parts.
3. CHECK FRONT AIR CONTROL OUTPUT
SIGNAL With CONSULT
Check “FAN ON” and “” in “DATA MONITOR” mode of “” using CONSULT.

Monitor item Condition Status

ON On
AIR COND SW A/C switch
OFF Off
ON On
FAN ON Blower motor
OFF Off
Is the inspection result
normal? YES >> GO
TO 4.
NO >> Replace A/C switch assembly. Refer to HAC-188, "Removal and Installation".
4. CHECK ECM INPUT
SIGNAL With CONSULT
Check “AIR COND SIG” and “HEATER FAN SW” in “DATA MONITOR” mode of “ECM” using CONSULT.

Monitor item Condition Status

ON On
AIR COND SIG A/C switch
OFF Off
ON On
HEATER FAN SW Blower motor
OFF Off
Is the inspection result
normal? YES >> GO
TO 5.
NO >> Check CAN communication system. Refer to LAN-16, "Trouble Diagnosis Flow Chart".
5. CHECK IPDM E/R INPUT
SIGNAL With CONSULT
1. Start engine.
 COMPRESSOR DOES NOT OPERATE
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]

Revision: October 2013 HAC-186 2014 Sentra NAM

 COMPRESSOR DOES NOT OPERATE
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]
2. Check “AC COMP REQ” in “DATA MONITOR” mode of “IPDM E/R” using CONSULT.
A
Monitor item Condition Status
ON On
AC COMP REQ A/C switch B
OFF Off

Is the inspection result normal?

YES >> Inspection End. C
NO >> Check CAN communication system. Refer to LAN-16, "Trouble Diagnosis Flow Chart".

HAC

Revision: October 2013 HAC-187 2014 Sentra NAM

 A/C ASSEMBLY SWITCH
< REMOVAL AND INSTALLATION > [MANUAL AIR CONDITIONER]

REMOVAL AND INSTALLATION

A/C ASSEMBLY SWITCH
Removal and Installation INFOID:0000000009757775

REMOVAL
1. Remove the CVT shift selector finisher (CVT: RE0F11A). Refer to TM-253, "Removal and Installation".
2. Remove the MT shift selector finisher (6MT: RS6F94R). Refer to TM-22, "Exploded View".
3. Remove the front air control screws.
4. Release the front air control metal clips using a suitable tool.
5. Disconnect the harness connectors from the A/C assembly switch and remove.
INSTALLATION
Installation is in the reverse order of removal.

Revision: October 2013

HAC-188 2014 Sentra NAM
 A/C AUTO AMP.
< REMOVAL AND INSTALLATION > [MANUAL AIR CONDITIONER]
A/C AUTO AMP.
A
Exploded View INFOID:0000000009757776

HAC
ALIIA0666ZZ

1. AV control unit bracket (LH) 2. AV control unit bracket (RH) 3. A/C auto amp. J
4. AV control unit

Removal and Installation INFOID:0000000009757777

K

REMOVAL
1. Remove the AV control unit. Refer to AV-406, "Removal and Installation". L
2. Remove the AV control unit bracket screws (A).

O
ALIIA0667ZZ

3. Remove the A/C auto amp.

P
INSTALLATION
Installation is in the reverse order of removal.

Revision: October 2013 HAC-189 2014 Sentra NAM

 INTAKE SENSOR
< REMOVAL AND INSTALLATION > [MANUAL AIR CONDITIONER]

INTAKE SENSOR
Removal and Installation INFOID:0000000009757778

The intake sensor is serviced as an assembly with the heating and cooling unit assembly. Refer to HA-43,
"HEATING AND COOLING UNIT ASSEMBLY : Removal and Installation".

Revision: October 2013

HAC-190 2014 Sentra NAM
 REFRIGERANT PRESSURE SENSOR
< REMOVAL AND INSTALLATION > [MANUAL AIR CONDITIONER]
REFRIGERANT PRESSURE SENSOR
A
Removal and Installation INFOID:0000000009757779

REMOVAL B
1. Discharge the refrigerant. Refer to HA-23, "Recycle Refrigerant".
2. Remove the core support upper. Refer to HA-39, "Exploded View".
C
3. Disconnect the harness connector from the refrigerant pressure sensor.
4. Remove the refrigerant pressure sensor (1).
CAUTION:
Cap or wrap the opening of the refrigerant pressure sensor D
with suitable material such as vinyl tape to avoid the entry
of air.
E

ALIIA0669ZZ

G
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Do not reuse O-ring. H
• Apply A/C oil to the O-ring of the refrigerant pressure sensor for installation.
• After charging refrigerant, check for leaks. Refer to HA-21, "Leak Test".
HAC

Revision: October 2013 HAC-191 2014 Sentra NAM

 DOOR MOTOR
< REMOVAL AND INSTALLATION > [MANUAL AIR CONDITIONER]
DOOR MOTOR
Exploded View INFOID:0000000009757780

AWIIA1604ZZ

1. Heating and cooling unit assembly 2. Intake door motor 3. Mode door motor
4. Air mix door motor

Revision: October 2013

HAC-192 2014 Sentra NAM
 DOOR MOTOR
< REMOVAL AND INSTALLATION > [MANUAL AIR CONDITIONER]
INTAKE DOOR MOTOR
A
INTAKE DOOR MOTOR : Removal and Installation INFOID:0000000009757781

REMOVAL B
1. Remove the heating and cooling unit assembly. Refer to HA-43, "HEATING AND COOLING UNIT
ASSEMBLY : Removal and Installation".
2. Disconnect the harness connector from the intake door motor. C
3. Remove the intake door motor screws and the intake door motor.
INSTALLATION
Installation is in the reverse order of removal. D
MODE DOOR MOTOR
MODE DOOR MOTOR : Removal and Installation INFOID:0000000009757782
E

REMOVAL
F
1. Remove the front floor duct LH. Refer to HA-42, "Exploded View".
2. Disconnect the harness connector from the mode door motor.
3. Remove the mode door motor screws and the mode door motor. G
INSTALLATION
Installation is in the reverse order of removal.
AIR MIX DOOR MOTOR H

AIR MIX DOOR MOTOR : Removal and Installation INFOID:0000000009757783

HAC
REMOVAL
1. Remove the glove box assembly. Refer to IP-22, "Removal and Installation".
2. Disconnect the harness connector from the air mix door motor. J
3. Remove the air mix door motor screws and the air mix door motor.
INSTALLATION
K
Installation is in the reverse order of removal.

Revision: October 2013 HAC-193 2014 Sentra NAM

 BLOWER MOTOR RESISTOR
< REMOVAL AND INSTALLATION > [MANUAL AIR CONDITIONER]
BLOWER MOTOR RESISTOR
Removal and Installation INFOID:0000000009757784

REMOVAL
1. Remove the instrument lower panel LH. Refer to IP-21, "Removal and Installation".
2. Disconnect the harness connector from the blower motor resistor.
3. Release the pawls using a suitable tool and remove the blower motor resistor.
INSTALLATION
Installation is in the reverse order of removal.

Revision: October 2013

HAC-194 2014 Sentra NAM