RESTRAINTS

SECTION
SEAT BELT CONTROL SYSTEM
SBC B

E
CONTENTS
PRECAUTION ............................................... 2 SEAT BELT WARNING SYSTEM .................... 12 F
Wiring Diagram ........................................................12
PRECAUTIONS ................................................... 2
Precaution for Supplemental Restraint System BASIC INSPECTION ................................... 15 G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ................................................................... 2 DIAGNOSIS AND REPAIR WORK FLOW ....... 15
Precautions Necessary for Steering Wheel Rota- Work Flow ................................................................15
SBC
tion After Battery Disconnection ................................ 2
Precautions for Removing Battery Terminal ............. 3
DTC/CIRCUIT DIAGNOSIS ......................... 16
REAR SEAT BELT BUCKLE SWITCH ............ 16
SYSTEM DESCRIPTION .............................. 4 I
Description ...............................................................16
COMPONENT PARTS ........................................ 4 Diagnosis Procedure ...............................................16
Component Inspection .............................................17
SEAT BELT WARNING LAMP SYSTEM .................... 4 J
SEAT BELT WARNING LAMP SYSTEM : Compo- POWER SUPPLY AND GROUND CIRCUIT .... 19
nent Parts Location ................................................... 4 Diagnosis Procedure ...............................................19
SEAT BELT WARNING LAMP SYSTEM : Rear K
Seat Belt Warning Unit .............................................. 7
REAR SEAT BELT WARNING LAMP .............. 20
Diagnosis Procedure ...............................................20
SEAT BELT WARNING LAMP SYSTEM : Rear
Seat Belt Buckle Switch ............................................ 7 VEHICLE SPEED SIGNAL CIRCUIT ................ 22 L
SYSTEM .............................................................. 8 Diagnosis Procedure ..............................................22

SEAT BELT WARNING LAMP SYSTEM .................... 8 SYMPTOM DIAGNOSIS .............................. 23

M
SEAT BELT WARNING LAMP SYSTEM : System
REAR SEAT BELT WARNING LAMP DOES
Description ................................................................ 8
SEAT BELT WARNING LAMP SYSTEM : Circuit
NOT ILLUMINATE ............................................ 23
Diagram ..................................................................... 9 Diagnosis Procedure ...............................................23 N

WARNING/INDICATOR/CHIME LIST ......................... 9 REAR SEAT BELT WARNING LAMP DOES

WARNING/INDICATOR/CHIME LIST : Warning NOT TURN OFF ................................................ 24
Diagnosis Procedure ...............................................24 O
Lamp/Indicator Lamp ................................................ 9
WARNING/INDICATOR/CHIME LIST : Warning
SEAT BELT WARNING CHIME DOES NOT
Chime ........................................................................ 9
SOUND .............................................................. 25 P
ECU DIAGNOSIS INFORMATION .............. 10 Diagnosis Procedure ...............................................25

REAR SEAT BELT WARNING UNIT .................10 REMOVAL AND INSTALLATION ............... 26
Reference Value ..................................................... 10
SEAT BELT WARNING LAMP ......................... 26
WIRING DIAGRAM ...................................... 12 Removal and Installation .........................................26

Revision: 2015 March SBC-1 D23

 PRECAUTIONS
< PRECAUTION >
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER" INFOID:0000000012078770

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 “SRS AIR BAG” and
“SEAT BELT” of this Service Manual.
WARNING:
Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision that 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 “SRS AIR BAG”.
• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-
vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, never 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 3 minutes before performing any service.
Precautions Necessary for Steering Wheel Rotation After Battery Disconnection
INFOID:0000000012078771

CAUTION:
Comply with the following cautions to prevent any error and malfunction.
• Before removing and installing any control units, first turn the ignition switch to the LOCK position,
then disconnect both battery cables.
• After finishing work, confirm that all control unit connectors are connected properly, then re-connect
both battery cables.
• Always use CONSULT to perform self-diagnosis as a part of each function inspection after finishing
work. If a DTC is detected, perform trouble diagnosis according to self-diagnosis results.
For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
If turning the steering wheel is required with the battery disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.
2. Turn the ignition switch to ACC position.
(At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock will remain released with both battery cables discon-
nected and the steering wheel can be turned.
4. Perform the necessary repair operation.

Revision: 2015 March SBC-2 D23

 PRECAUTIONS
< PRECAUTION >
5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the ignition switch from ACC position to ON position, then to LOCK position. (The steering wheel will lock A
when the ignition switch is turned to LOCK position.)
6. Perform self-diagnosis check of all control units using CONSULT.
Precautions for Removing Battery Terminal INFOID:0000000012078772
B

When disconnecting the battery terminal, pay attention to the following.

• Always use a 12V battery as power source. C
• Never disconnect battery terminal while engine is running.
• When removing the 12V battery terminal, turn OFF the ignition
switch and wait at least 30 seconds.
D
• For vehicles with the engine listed below, remove the battery termi-
nal after a lapse of the specified time:

D4D engine : 20 minutes YS23DDT : 4 minutes E

HRA2DDT : 12 minutes YS23DDTT : 4 minutes
K9K engine : 4 minutes ZD30DDTi : 60 seconds
M9R engine : 4 minutes ZD30DDTT : 60 seconds F
R9M engine : 4 minutes
SEF289H
V9X engine : 4 minutes
YD25DDTi : 2 minutes G
NOTE:
ECU may be active for several tens of seconds after the ignition switch is turned OFF. If the battery terminal
is removed before ECU stops, then a DTC detection error or ECU data corruption may occur. SBC
• After high-load driving, if the vehicle is equipped with the V9X engine, turn the ignition switch OFF and wait
for at least 15 minutes to remove the battery terminal.
NOTE: I
• Turbocharger cooling pump may operate in a few minutes after the ignition switch is turned OFF.
• Example of high-load driving
- Driving for 30 minutes or more at 140 km/h (86 MPH) or more.
- Driving for 30 minutes or more on a steep slope. J
• For vehicles with the 2-batteries, be sure to connect the main battery and the sub battery before turning ON
the ignition switch.
NOTE: K
If the ignition switch is turned ON with any one of the terminals of main battery and sub battery discon-
nected, then DTC may be detected.
• After installing the 12V battery, always check "Self Diagnosis Result" of all ECUs and erase DTC.
NOTE: L
The removal of 12V battery may cause a DTC detection error.

Revision: 2015 March SBC-3 D23

 COMPONENT PARTS
< SYSTEM DESCRIPTION >
SYSTEM DESCRIPTION
COMPONENT PARTS
SEAT BELT WARNING LAMP SYSTEM
SEAT BELT WARNING LAMP SYSTEM : Component Parts Location INFOID:0000000012072214

DOUBLE CAB MODELS

JMHIA3074ZZ

View with instrument panel View with instrument lower panel re-
moved

Revision: 2015 March SBC-4 D23

 COMPONENT PARTS
< SYSTEM DESCRIPTION >

No. Component Function A

Rear seat belt buckle
Refer to SBC-7, "SEAT BELT WARNING LAMP SYSTEM : Rear Seat Belt Buckle Switch".
switch (RH)
Combination meter Transmits vehicle speed signal to rear seat belt warning unit. B
Rear seat belt buckle
Refer to SBC-7, "SEAT BELT WARNING LAMP SYSTEM : Rear Seat Belt Buckle Switch".
switch (center and LH)
Rear seat belt warning • Receives rear seat belt warning lamp signal from rear seat belt warning unit. C
lamp • Turns the seat belt warning lamp ON when the seat belt is unfastened.
Rear seat belt warning unit Refer to SBC-7, "SEAT BELT WARNING LAMP SYSTEM : Rear Seat Belt Warning Unit".
D
KING CAB MODELS

SBC

Revision: 2015 March SBC-5 D23

 COMPONENT PARTS
< SYSTEM DESCRIPTION >

JMHIA3130ZZ

View with instrument panel View with instrument lower panel re-
moved

No. Component Function

Rear seat belt buckle
Refer to SBC-7, "SEAT BELT WARNING LAMP SYSTEM : Rear Seat Belt Buckle Switch".
switch (RH and LH)
Combination meter Transmits vehicle speed signal to rear seat belt warning unit.
Rear seat belt warning • Receives rear seat belt warning lamp signal from rear seat belt warning unit.
lamp • Turns the seat belt warning lamp ON when the seat belt is unfastened.
Rear seat belt warning unit Refer to SBC-7, "SEAT BELT WARNING LAMP SYSTEM : Rear Seat Belt Warning Unit".

Revision: 2015 March SBC-6 D23

 COMPONENT PARTS
< SYSTEM DESCRIPTION >
SEAT BELT WARNING LAMP SYSTEM : Rear Seat Belt Warning Unit INFOID:0000000012072215

A
• Detects the status of rear seat belt buckle switch and controls the
warning function.
• Judges the status of vehicle by detection of the signal transmitted B
by vehicle speed and performs the control of seat belt warning ON/
OFF function.
• The buzzer is installed in the rear seat belt warning unit.
C

D
JMHIA2685ZZ

SEAT BELT WARNING LAMP SYSTEM : Rear Seat Belt Buckle Switch INFOID:0000000012072216
E
• Detects rear seat belt feature status signal transmits signal to rear
seat belt warning unit.
• The seat belt buckle switch is installed in the seat belt buckle. F

SBC
JMHIA3136ZZ

Revision: 2015 March SBC-7 D23

 SYSTEM
< SYSTEM DESCRIPTION >
SYSTEM
SEAT BELT WARNING LAMP SYSTEM
SEAT BELT WARNING LAMP SYSTEM : System Description INFOID:0000000012072220

SYSTEM DIAGRAM

JMHIA3135GB

FRONT SEAT BELT WARNING LAMP OPERATION

Seat belt warning lamp warns the driver that driver or passenger seat belt is not fastened. Refer to MWI-56,
"WARNING LAMPS/INDICATOR LAMPS : Seat Belt Warning Lamp (For Australia)".

REAR SEAT BELT WARNING LAMP OPERATION

Rear seat belt warning lamp turns ON the rear seat belt warning lamp corresponding to the seat position
where any rear seat belt buckle (LH,RH or center) is not fastened.
Rear seat belt warning lamp turns ON for the unfastened seat belt for 35 seconds when the vehicle speed is 9
km/h (5.6 MPH) or more for the first time after the ignition switch is turned ON.
Rear seat belt warning lamp turns OFF in any of the following conditions.
• When the rear seat belt which corresponding to the illuminating rear seat belt warning lamp is fastened.
• When rear seat belt warning lamp turns ON for more than 35 seconds.
Even after the rear seat belt warning lamp turns OFF at a vehicle speed of 9 km/h (5.6 MPH) or more, the rear
seat belt warning lamp turns ON when the seat belt is unfastened status.
In addition, when the seat belt is unfastened from the fastened status on while the rear seat belt warning lamp
turned ON at a vehicle speed of 9 km/h (5.6 MPH) or more, the rear seat belt warning lamp remains ON for 35
seconds after the seat belt is unfastened.
REAR SEAT BELT WARNING CHIME OPERATION
When any of the rear seat belt buckle (LH,RH or center) is unfastened from the fastened status at a vehicle
speed of 15 km/h (9.3 MPH) or more, a chime integrated in the seat belt warning unit sounds for 0.5 seconds.
Within 5 seconds after chime sounds, even when the rear seat belt buckle is again detected changing from
fastened, the chime does not sound.

Revision: 2015 March SBC-8 D23

 SYSTEM
< SYSTEM DESCRIPTION >
SEAT BELT WARNING LAMP SYSTEM : Circuit Diagram INFOID:0000000012072221

SBC

K
JMHIA3132GB

WARNING/INDICATOR/CHIME LIST
L
WARNING/INDICATOR/CHIME LIST : Warning Lamp/Indicator Lamp INFOID:0000000012072222

M
Item Design Reference
For layout, refer to MWI-11, "METER SYSTEM : Design".
Seat belt warning lamp For function, refer to MWI-56, "WARNING LAMPS/INDICATOR LAMPS : Seat Belt N
Warning Lamp (For Australia)".

WARNING/INDICATOR/CHIME LIST : Warning Chime INFOID:0000000012072223

O

Item Reference
Seat belt warning Refer to WCS-28, "WARNING CHIME : Seat Belt Warning (For Australia)".
P

Revision: 2015 March SBC-9 D23

 REAR SEAT BELT WARNING UNIT
< ECU DIAGNOSIS INFORMATION >
ECU DIAGNOSIS INFORMATION
REAR SEAT BELT WARNING UNIT
Reference Value INFOID:0000000012072230

TERMINAL LAYOUT

JMHIA3155ZZ

PHYSICAL VALUES

Terminal No.
Description
(Wire color)
Condition Value (V)
Input/
+ - Signal name
Output
Ignition Seat belt is fastened. 9 - 16
1 Rear seat belt buckle
Ground Input switch
(Y) switch (RH) signal Seat belt is unfastened. 0
ON
Seat belt warning lamp is illu-
Ignition 9 - 16
3 Rear seat belt warn- minated.
Ground Output switch
(LG) ing lamp signal (LH) Seat belt warning lamp is not il-
ON 0
luminated.
Seat belt warning lamp is illu-
Rear seat belt warn- Ignition 9 - 16
4* minated.
Ground ing lamp signal (cen- Output switch
(GR) Seat belt warning lamp is not il-
ter) ON 0
luminated.
Seat belt warning lamp is illu-
Ignition 9 - 16
5 Rear seat belt warn- minated.
Ground Output switch
(BG) ing lamp signal (RH) Seat belt warning lamp is not il-
ON 0
luminated.
Ignition Seat belt is fastened. 9 - 16
6* Rear seat belt buckle
Ground Input switch
(V) switch (center) signal Seat belt is unfastened. 0
ON
Ignition Seat belt is fastened. 9 - 16
7 Rear seat belt buckle
Ground Input switch
(G) switch (LH) signal Seat belt is unfastened. 0
ON
8
Ground Ground — — — 0
(B)

Revision: 2015 March SBC-10 D23

 REAR SEAT BELT WARNING UNIT
< ECU DIAGNOSIS INFORMATION >
Terminal No.
Description
(Wire color) A
Condition Value (V)
Input/
+ - Signal name
Output
NOTE: B
The maximum voltage varies de-
pending on the specification
(destination unit)
C
Ignition Speedometer operated
9
Ground Vehicle speed signal Input switch [When vehicle speed is ap-
(W)
ON prox. 40 km/h (25 MPH)]
D

JSNIA0015GB
E

Ignition
10
Ground Ignition switch signal Input switch — 9 - 16
(R)
ON F
*: Only double cab models

SBC

Revision: 2015 March SBC-11 D23

 SEAT BELT WARNING SYSTEM
< WIRING DIAGRAM >
WIRING DIAGRAM
SEAT BELT WARNING SYSTEM
Wiring Diagram INFOID:0000000012072233

JRHWC3684GB

Revision: 2015 March SBC-12 D23

 SEAT BELT WARNING SYSTEM
< WIRING DIAGRAM >

SBC

JRHWC3685GB

Revision: 2015 March SBC-13 D23

 SEAT BELT WARNING SYSTEM
< WIRING DIAGRAM >

JRHWC3686GB

Revision: 2015 March SBC-14 D23

 DIAGNOSIS AND REPAIR WORK FLOW
< BASIC INSPECTION >
BASIC INSPECTION A
DIAGNOSIS AND REPAIR WORK FLOW
Work Flow INFOID:0000000012078937
B

DETAILED FLOW
1.OBTAIN INFORMATION ABOUT SYMPTOM C
Interview the customer to obtain the malfunction information (conditions and environment when the malfunc-
tion occurred) as much as possible when the customer brings the vehicle in.
D
>> GO TO 2.
2.REPRODUCE THE MALFUNCTION INFORMATION E
Check the malfunction on the vehicle that the customer describes.
Inspect the relation of the symptoms and the condition when the symptoms occur.
F
>> GO TO 3.
3.IDENTIFY THE MALFUNCTIONING SYSTEM WITH “SYMPTOM DIAGNOSIS” G
Use “Symptom diagnosis” from the symptom inspection result in step 2 and then identify where to start per-
forming the diagnosis based on possible causes and symptoms.
SBC
>> GO TO 4.
4.IDENTIFY THE MALFUNCTIONING PARTS WITH “DTC/CIRCUIT DIAGNOSIS”
I
Perform the diagnosis with “DTC/CIRCUIT DIAGNOSIS” of the applicable system.

>> GO TO 5. J
5.REPAIR OR REPLACE THE MALFUNCTIONING PARTS
Repair or replace the specified malfunctioning parts.
K
>> GO TO 6.
6.FINAL CHECK L
Check that malfunctions are not reproduced when obtaining the malfunction information from the customer,
referring to the symptom inspection result in step 2.
Are the malfunctions corrected? M
YES >> INSPECTION END
NO >> GO TO 3.
N

Revision: 2015 March SBC-15 D23

 REAR SEAT BELT BUCKLE SWITCH
< DTC/CIRCUIT DIAGNOSIS >
DTC/CIRCUIT DIAGNOSIS
REAR SEAT BELT BUCKLE SWITCH
Description INFOID:0000000012072274

• Detects if the seat belt is fastened or unfastened.

• Warning lamp turns OFF if the seat belt is fastened.
Diagnosis Procedure INFOID:0000000012072275

1.CHECK REAR SEAT BELT BUCKLE CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect rear seat belt buckle switch connector.
3. Turn ignition switch ON.
4. Check the voltage between rear seat belt buckle switch harness connector and ground.
Double cab models
Rear seat belt buckle switch
Voltage
Connector Terminal
LH 1 Ground
B77
Center 3 9 - 16 V
RH B76 1

King cab models

Rear seat belt buckle switch
Voltage
Connector Terminal
Ground
LH 1
B78 9 - 16 V
RH 3
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK REAR SEAT BELT BUCKLE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear seat belt warning unit connector.
3. Check continuity between rear seat belt warning unit harness connector and rear seat belt buckle switch
harness connector.
Double cab models
Rear seat belt warning unit Rear seat belt buckle switch
Continuity
Connector Terminal Connector Terminal
7 LH 1
B77
M113 6 Center 3 Existed
1 RH B76 1

King cab models

Rear seat belt warning unit Rear seat belt buckle switch
Continuity
Connector Terminal Connector Terminal
7 LH 1
M113 B78 Existed
1 RH 3
4. Check continuity between rear seat belt warning unit harness connector and ground.

Revision: 2015 March SBC-16 D23

 REAR SEAT BELT BUCKLE SWITCH
< DTC/CIRCUIT DIAGNOSIS >
Double cab models
Rear seat belt warning unit A
Continuity
Connector Terminal
7 Ground
M113 6 Not existed
B

King cab models C

Rear seat belt warning unit
Continuity
Connector Terminal
Ground
7 D
M113 Not existed
1
Is the inspection result normal?
E
YES >> Replace rear seat belt warning unit. Refer to SR-31, "Removal and Installation".
NO >> Repair or replace harness.
3.CHECK REAR SEAT BELT BUCKLE SWITCH GROUND CIRCUIT F
Check continuity between rear seat belt buckle switch harness connector and ground.
Double cab models
Rear seat belt buckle switch G
Continuity
Connector Terminal
LH 2 Ground
B77 SBC
Center 4 Existed
RH B76 2

King cab models I

Rear seat belt buckle switch
Continuity
Connector Terminal
Ground J
LH 2
B78 Existed
RH 4
Is the inspection result normal? K
YES >> GO TO 4.
NO >> Repair or replace harness.
4.CHECK REAR SEAT BELT BUCKLE SWITCH L

Check rear seat belt buckle switch.

Refer to SBC-17, "Component Inspection".
M
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace rear seat belt buckle switch. Refer to SB-28, "SEAT BELT BUCKLE : Removal and Instal-
lation" (king cab models) or SB-46, "SEAT BELT BUCKLE AND TONGUE : Removal and Installa- N
tion" (double cab models).
5.CHECK INTERMITTENT INCIDENT O
Refer to GI-47, "Intermittent Incident".

>> INSPECTION END P

Component Inspection INFOID:0000000012072276

1.CHECK REAR SEAT BELT BUCKLE SWITCH

Check continuity between rear seat belt buckle switch connector.

Revision: 2015 March SBC-17 D23

 REAR SEAT BELT BUCKLE SWITCH
< DTC/CIRCUIT DIAGNOSIS >
Double cab models
Rear seat belt buckle switch
Condition Continuity
Connector Terminal
Rear seat belt (LH) is unfastened Existed
1 2
Rear seat belt (LH) is fastened Not existed
LH and center
Rear seat belt (center) is unfastened Existed
3 4
Rear seat belt (center) is fastened Not existed
Rear seat belt (RH) is unfastened Existed
RH 1 2
Rear seat belt (RH) is fastened Not existed

King cab models

Rear seat belt buckle switch
Condition Continuity
Connector Terminal
Rear seat belt (LH) is unfastened Existed
1 2
Rear seat belt (LH) is fastened Not existed
LH and RH
Rear seat belt (RH) is unfastened Existed
3 4
Rear seat belt (RH) is fastened Not existed
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace rear seat belt buckle switch. Refer to SB-28, "SEAT BELT BUCKLE : Removal and Instal-
lation" (king cab models) or SB-46, "SEAT BELT BUCKLE AND TONGUE : Removal and Installa-
tion" (double cab models).

Revision: 2015 March SBC-18 D23

 POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
A
Diagnosis Procedure INFOID:0000000012072277

1.CHECK FUSE B
Check that the following fuse is not fusing.

Signal name Fuse No. C

Ignition power supply 31 (5 A)
Is the inspection result normal?
D
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit if a fuse are blown.
2.CHECK REAR SEAT BELT WARNING UNIT POWER SUPPLY E
1. Turn ignition switch OFF.
2. Disconnect rear seat belt warning unit connector.
3. Turn ignition switch ON. F
4. Check voltage continuity between rear seat belt warning unit harness connector and ground.

Rear seat belt warning unit

Ground Voltage G
Connector Terminal
M113 10 Ground 9 - 16 V
Is the inspection result normal? SBC
YES >> GO TO 3.
NO >> Repair or replace harness connector.
3.CHECK REAR SEAT BELT WARNING UNIT GROUND CIRCUIT I

1. Turn ignition switch OFF.

2. Check continuity between rear seat belt warning unit harness connector and ground.
J
Rear seat belt warning unit
Ground Continuity
Connector Terminal
K
M113 8 Ground Existed
Is the inspection result normal?
YES >> INSPECTION END L
NO >> Repair or replace harness connector.

Revision: 2015 March SBC-19 D23

 REAR SEAT BELT WARNING LAMP
< DTC/CIRCUIT DIAGNOSIS >
REAR SEAT BELT WARNING LAMP
Diagnosis Procedure INFOID:0000000012072279

1.CHECK REAR SEAT BELT WARNING LAMP INPUT SIGNAL

1. Turn ignition switch OFF.
2. Disconnect rear seat belt warning lamp connector.
3. Turn ignition switch ON.
4. Check voltage between rear seat belt warning lamp harness connector and ground.

Rear seat belt warning lamp

Ground Condition Voltage (V)
Connector Terminal
Rear seat belt (LH) is
9 - 16
unfastened
LH 3
Rear seat belt (LH) is
0
fastened
Rear seat belt (center)
9 - 16
is unfastened
Center* M112 4 Ground
Rear seat belt (center)
0
is fastened
Rear seat belt (RH) is
9 - 16
unfastened
RH 5
Rear seat belt (RH) is
0
fastened
*: Only double cab models
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK REAR SEAT BELT WARNING LAMP GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear seat belt warning lamp harness connector and ground.

Rear seat belt warning lamp

Ground Continuity
Connector Terminal
M113 2 Ground Existed
Is the inspection result normal?
YES >> Replace rear seat belt warning lamp. Refer to SBC-26, "Removal and Installation".
NO >> Repair or replace harness.
3.CHECK REAR SEAT BELT WARNING LAMP INPUT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear seat belt warning unit connector.
3. Check continuity between rear seat belt warning unit harness connector and rear seat belt warning lamp
harness connector.

Rear seat belt warning lamp Rear seat belt warning unit
Continuity
Connector Terminal Connector Terminal
3 3
M112 4* M113 4* Existed
5 5
*: Only double cab models
4. Check continuity between rear seat belt warning unit harness connector and ground.

Revision: 2015 March SBC-20 D23

 REAR SEAT BELT WARNING LAMP
< DTC/CIRCUIT DIAGNOSIS >

Rear seat belt warning unit A

Ground Continuity
Connector Terminal
3
M113 4* Ground Not existed
B

5
*: Only double cab models C
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness. D
4.REPLACE REAR SEAT BELT WARNING UNIT
Replace rear seat belt waring unit. Refer to SR-31, "Removal and Installation".
E
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5.
F
5.CHECK INTERMITTENT INCIDENT
Refer to GI-47, "Intermittent Incident".
G
>> INSPECTION END

SBC

Revision: 2015 March SBC-21 D23

 VEHICLE SPEED SIGNAL CIRCUIT
< DTC/CIRCUIT DIAGNOSIS >
VEHICLE SPEED SIGNAL CIRCUIT
Diagnosis Procedure INFOID:0000000012072280

1.CHECK VEHICLE SPEED SIGNAL CIRCUIT

1. Disconnect rear seat belt warning unit harness connector and combination meter harness connector.
2. Check continuity between Rear seat belt warning unit harness connector and combination meter harness
connector.
With Intelligent Key models
Rear seat belt warning unit Combination meter
Continuity
Connector Terminal Connector Terminal
M113 9 M49 39 Existed

Monochrome information display models without Intelligent Key models

Rear seat belt warning unit Combination meter
Continuity
Connector Terminal Connector Terminal
M113 9 M51 18 Existed

Color information display models without Intelligent Key models

Rear seat belt warning unit Combination meter
Continuity
Connector Terminal Connector Terminal
M113 9 M102 39 Existed
3. Check continuity between Rear seat belt warning unit harness connector and ground.

Rear seat belt warning unit

Continuity
Connector Terminal Ground
M113 9 Not existed
Is the inspection result normal?
YES >> Check combination meter. Refer to MWI-248, "DTC Description".
NO >> Repair or replace harness.

Revision: 2015 March SBC-22 D23

 REAR SEAT BELT WARNING LAMP DOES NOT ILLUMINATE
< SYMPTOM DIAGNOSIS >
SYMPTOM DIAGNOSIS A
REAR SEAT BELT WARNING LAMP DOES NOT ILLUMINATE
Diagnosis Procedure INFOID:0000000012072284
B

1.CHECK REAR SEAT BELT WARNING UNIT POWER SUPPLY AND GROUND
Check rear seat belt warning unit power supply and ground. Refer to SBC-19, "Diagnosis Procedure". C
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning parts. D
2.CHECK REAR SEAT BELT BUCKLE SWITCH CIRCUIT
Check rear seat belt buckle switch circuit. Refer to SBC-16, "Diagnosis Procedure". E
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace the malfunctioning parts. F
3.CHECK VEHICLE SPEED SIGNAL CIRCUIT
Check vehicle speed signal circuit. Refer to SBC-22, "Diagnosis Procedure".
Is the inspection result normal? G
YES >> GO TO 4.
NO >> Repair or replace the malfunctioning parts.
SBC
4.CHECK REAR SEAT BELT WARNING LAMP CIRCUIT
Check rear seat belt warning lamp circuit. Refer to SBC-20, "Diagnosis Procedure".
Is the inspection result normal? I
YES >> GO TO 5.
NO >> Repair or replace the malfunctioning parts.
5.REPLACE REAR SEAT BELT WARNING UNIT J

1. Replace rear seat belt warning unit. Refer to SR-31, "Removal and Installation".
2. Confirm the operation after replacement.
K
Is the result normal?
YES >> INSPECTION END
NO >> Check intermittent incident. Refer to GI-47, "Intermittent Incident".
L

Revision: 2015 March SBC-23 D23

 REAR SEAT BELT WARNING LAMP DOES NOT TURN OFF
< SYMPTOM DIAGNOSIS >
REAR SEAT BELT WARNING LAMP DOES NOT TURN OFF
Diagnosis Procedure INFOID:0000000012072285

1.CHECK REAR SEAT BELT BUCKLE SWITCH CIRCUIT

Check rear seat belt buckle switch circuit. Refer to SBC-16, "Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning parts.
2.CHECK REAR SEAT BELT WARNING LAMP CIRCUIT
Check rear seat belt warning lamp circuit. Refer to SBC-20, "Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace the malfunctioning parts.
3.REPLACE REAR SEAT BELT WARNING UNIT
1. Replace rear seat belt warning unit. Refer to SR-31, "Removal and Installation".
2. Confirm the operation after replacement.
Is the result normal?
YES >> INSPECTION END
NO >> Check intermittent incident. Refer to GI-47, "Intermittent Incident".

Revision: 2015 March SBC-24 D23

 SEAT BELT WARNING CHIME DOES NOT SOUND
< SYMPTOM DIAGNOSIS >
SEAT BELT WARNING CHIME DOES NOT SOUND
A
Diagnosis Procedure INFOID:0000000012072286

1.CHECK REAR SEAT BELT WARNING LAMP FUNCTION B

Check rear seat belt warning lamp function.
Is the inspection result normal?
C
YES >> GO TO 2.
NO >> Check rear seat belt warning lamp. Refer to SBC-23, "Diagnosis Procedure".
2.CHECK REAR SEAT BELT WARNING UNIT POWER SUPPLY AND GROUND D
Check rear seat belt warning unit power supply and ground. Refer to SBC-19, "Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 3. E
NO >> Repair or replace the malfunctioning parts.
3.CHECK REAR SEAT BELT BUCKLE SWITCH CIRCUIT
F
Check rear seat belt buckle switch circuit. Refer to SBC-16, "Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 4. G
NO >> Repair or replace the malfunctioning parts.
4.CHECK VEHICLE SPEED SIGNAL CIRCUIT
Check vehicle speed signal circuit. Refer to SBC-22, "Diagnosis Procedure". SBC
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace the malfunctioning parts. I
5.REPLACE REAR SEAT BELT WARNING UNIT
1. Replace rear seat belt warning unit. Refer to SR-31, "Removal and Installation". J
2. Confirm the operation after replacement.
Is the result normal?
YES >> INSPECTION END K
NO >> Check intermittent incident. Refer to GI-47, "Intermittent Incident".

Revision: 2015 March SBC-25 D23

 SEAT BELT WARNING LAMP
< REMOVAL AND INSTALLATION >
REMOVAL AND INSTALLATION
SEAT BELT WARNING LAMP
Removal and Installation INFOID:0000000012079164

REMOVAL
1. Apply protective tapes on the part to protect it from damage.
2. Disengage rear seat belt warning lamp fixing pawls using a
remover tool (A) and then remove rear seat belt warning lamp
from instrument panel.

: Pawl

3. Disconnect rear seat belt warning lamp connector.

JMHIA3109ZZ

INSTALLATION
Install in the reverse order of removal.

Revision: 2015 March SBC-26 D23