K ELECTRICAL

SECTION
BODY CONTROL SYSTEM
BCS B

E
CONTENTS
PRECAUTIONS .......................................................... 2 CAN Communication System Description ................ 8 F
Precautions for Supplemental Restraint System Schematic ................................................................. 9
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN- CONSULT-II Function (BCM) ................................. 11
SIONER” .................................................................. 2 CONSULT–II INSPECTION PROCEDURE ......... 11 G
BCM (BODY CONTROL MODULE) ........................... 3 ITEMS OF EACH PART ...................................... 12
System Description .................................................. 3 WORK SUPPORT ............................................... 12
BCM FUNCTION ................................................... 3 CAN Communication Inspection Using CONSULT-
H
COMBINATION SWITCH READING FUNCTION..... 3 II (Self-Diagnosis) ................................................... 13
CAN COMMUNICATION CONTROL .................... 6 Configuration .......................................................... 13
BCM STATUS CONTROL ..................................... 6 DESCRIPTION .................................................... 13
SYSTEMS CONTROLLED BY BCM DIRECTLY..... 7 READ CONFIGURATION PROCEDURE ............ 13 I
SYSTEMS CONTROLLED BY BCM AND IPDM WRITE CONFIGURATION PROCEDURE .......... 16
E/R ........................................................................ 7 BCM ........................................................................ 20
MAJOR COMPONENTS AND CONTROL SYS- REMOVAL AND INSTALLATION ........................ 20 J
TEM ....................................................................... 7

BCS

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 PRECAUTIONS

PRECAUTIONS PFP:00001

Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER” EKS00AEY

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. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
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 per-
formed by an authorized NISSAN/INFINITI dealer.
● Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS 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
harness connectors.

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 BCM (BODY CONTROL MODULE)

BCM (BODY CONTROL MODULE) PFP:284B2

A
System Description EKS00AEZ

● BCM (Body Control Module) controls the operation of various electrical units installed on the vehicle.
BCM FUNCTION B
BCM has a combination switch reading function for reading the operation of combination switches (light, wiper
washer, turn signal) in addition to the function for controlling the operation of various electrical components.
Also, it functions as an interface that receives signals from the front air control, and sends signals to ECM C
using CAN communication.
COMBINATION SWITCH READING FUNCTION
D
1. Description
● BCM reads combination switch (light, wiper) status, and controls various electrical components accord-
ing to the results.
E
● BCM reads information of a maximum of 20 switches by combining five output terminals (OUTPUT 1-5)
and five input terminals (INPUT 1-5).
2. Operation description
F
● BCM activates transistors of output terminals (OUTPUT 1-5) periodically and allows current to flow in
turn.
● If any (1 or more) of the switches are turned ON, circuit of output terminals (OUTPUT 1-5) and input ter-
minals (INPUT 1-5) becomes active. G
● At this time, transistors of output terminals (OUTPUT 1-5) are activated to allow current to flow. When
voltage of input terminals (INPUT 1-5) corresponding to that switch changes, interface in BCM detects
voltage change and BCM determines that switch is ON. H

BCS

LIIA1323E

3. BCM - Operation table of combination switch

● BCM reads operation status of combination switch by the combination shown in the following table.

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 BCM (BODY CONTROL MODULE)

LIIA1324E

NOTE:
Headlamp has a dual system switch.

4. Example operation: (When lighting switch 1st position turned ON)

● When lighting switch 1st position is turned ON, contact in combination switch turns ON. At this time if
OUTPUT 4 transistor is activated, BCM detects that voltage changes in INPUT 5.
● When OUTPUT 4 transistor is ON, BCM detects that voltage changes in INPUT 5, and judges lighting
switch 1st position is ON. Then BCM sends tail lamp ON signal to IPDM E/R using CAN communica-
tion.
● When OUTPUT 4 transistor is activated again, BCM detects that voltage changes in INPUT 5 and rec-
ognizes that lighting switch 1st position is continuously ON.

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 BCM (BODY CONTROL MODULE)

LIIA1325E
I
NOTE:
Each OUTPUT terminal transistor is activated at 10 ms intervals. Therefore, after a switch is turned ON,
electrical loads are activated with a time delay. But this time delay is so short that it cannot be noticed. J
5. Operation mode
● Combination switch reading function has operation modes as follows:

Normal status BCS

● When BCM is not in sleep status, OUTPUT terminals (1-5) each turn ON-OFF every 10 ms.

Sleep status
L

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 BCM (BODY CONTROL MODULE)

● When BCM is in sleep mode, transistors of OUTPUT 1 and 5 stop the output, and BCM enters low-cur-
rent-consumption mode. OUTPUTS (2, 3, and 4) turn ON-OFF at 60 ms intervals, and receives lighting
switch input only.

WKIA4093E

CAN COMMUNICATION CONTROL

CAN communication allows a high rate of information through the two communication lines (CAN-L, CAN-H)
connecting the various control units in the system. Each control unit transmits/receives data, but selectively
reads required data only.

BCM STATUS CONTROL

BCM changes its status depending on the operation status in order to reduce power consumption.
1. CAN communication status
● With ignition switch ON, CAN communicates with other control units normally.

● Control by BCM is being operated properly.

● When ignition switch is OFF, switching to sleep mode is possible.

● Even when ignition switch is OFF, if CAN communication with IPDM E/R and combination meter is
active, CAN communication status is active.
2. Sleep transient status
● This status shuts down CAN communication when ignition switch is turned OFF.

● It transmits sleep request signal to IPDM E/R and combination meter.

● Two seconds after CAN communication of all control units stops, CAN communication switches to inac-
tive status.
3. CAN communication inactive status
● With ignition switch OFF, CAN communication is not active.

● With ignition switch OFF, control performed only by BCM is active.

● Three seconds after CAN communication of all control units stops, CAN communication switches to
inactive status.

4. Sleep status
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 BCM (BODY CONTROL MODULE)

● BCM is activated with low current consumption mode.

● CAN communication is not active. A
● When CAN communication operation is detected, it switches to CAN communication status.
● When a state of the following switches changes, it switches to CAN communication state:
B
– Ignition switch
– Key switch (insert)
– Hazard switch C
– Main door lock/unlock switch
– Front door switch (LH, RH)
– Rear door switch (LH, RH) (Crew Cab) D
– Rear door switch upper (LH, RH) (King Cab)
– Rear door switch lower (LH, RH) (King Cab)
– Combination switch (passing, lighting switch 1st position, front fog lamp) E
– Keyfob (lock/unlock signal)
– Front door lock assembly LH (key cylinder switch)
F
● When control performed only by BCM is required by switch, it shifts to CAN communication inactive
mode.
● Status of combination switch reading function is changed.
G
SYSTEMS CONTROLLED BY BCM DIRECTLY
● Power door lock system. Refer to BL-16, "POWER DOOR LOCK SYSTEM" .
● Remote keyless entry system. Refer to BL-56, "REMOTE KEYLESS ENTRY SYSTEM" . H
NOTE
● Power window system. Refer to GW-20, "POWER WINDOW SYSTEM" .
● Sunroof system. Refer to RF-10, "SUNROOF" . NOTE I
● Room lamp timer. Refer to LT-131, "INTERIOR ROOM LAMP" .
● Warning chime system. Refer to DI-42, "WARNING CHIME" .
● Turn signal and hazard warning lamps system. Refer to LT-76, "TURN SIGNAL AND HAZARD WARNING J
LAMPS" .
● Trailer turn signal and hazard warning lamps system (if equipped). Refer to LT-123, "TRAILER TOW" .
NOTE: BCS
Power supply only. No system control.
SYSTEMS CONTROLLED BY BCM AND IPDM E/R
● Panic system. Refer to BL-56, "REMOTE KEYLESS ENTRY SYSTEM" . L
● Vehicle security (theft warning) system. Refer to BL-93, "VEHICLE SECURITY (THEFT WARNING) SYS-
TEM" .
M
● NVIS (NATS) system. Refer to BL-139, "NVIS(NISSAN Vehicle Immobilizer System-NATS)" .
● Headlamp, tail lamp, front fog lamp, auto light and battery saver control systems. Refer to LT-5, "HEAD-
LAMP (FOR USA)" , LT-33, "HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -" , LT-108,
"PARKING, LICENSE PLATE AND TAIL LAMPS" , LT-65, "FRONT FOG LAMP" or LT-47, "AUTO LIGHT
SYSTEM" .
● Front wiper and washer system. Refer to WW-3, "FRONT WIPER AND WASHER SYSTEM" .
MAJOR COMPONENTS AND CONTROL SYSTEM
System Input Output
● All door locking actuators
Remote keyless entry system Remote keyless entry receiver (keyfob)
● Turn signal lamps
● Front power door lock/unlock switch (LH, RH)
Power door lock system ● All door switches All door locking actuators
● Key switch

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 BCM (BODY CONTROL MODULE)

System Input Output

Power supply [ignition (IGN)/retained
Power supply to power window and
accessory power (RAP)] to power win- IGN/RAP supply
sunroof system
dow and sunroof
Power supply (BAT) to power window Power supply to power window and
Battery power supply
and sunroof sunroof system
● Key switch
Panic alarm IPDM E/R
● Remote keyless entry receiver (keyfob)
● Optical sensor
Auto light system IPDM E/R
● Combination switch
● Ignition switch
Battery saver control ● Combination switch IPDM E/R
● Front door switch LH and RH
Headlamp Combination switch IPDM E/R
Tail lamp Combination switch IPDM E/R
Front fog lamp Combination switch IPDM E/R
● Turn signal lamp
Turn signal lamp Combination switch
● Combination meter
● Turn signal lamp
Hazard lamp Hazard switch
● Combination meter
● Key switch
● Remote keyless entry receiver (keyfob)
Room lamp timer ● Main power window and door lock/unlock switch Interior room lamp
● Front door lock assembly LH (key cylinder switch)
● All door switches
● Key switch Combination meter (warning
Key warning chime
● Front door switch LH buzzer)

● Combination switch
Combination meter (warning
Light warning chime ● Key switch
buzzer)
● Front door switch LH

Vehicle-speed-sensing intermittent ● Combination switch

IPDM E/R
wiper ● Combination meter
Rear window defogger (Crew Cab mod-
Rear window defogger switch IPDM E/R
els only)
Air conditioner switch signal Front air control ECM
Blower fan switch signal Front air control ECM
● Combination meter
Low tire pressure warning system Remote keyless entry receiver
● Display control unit
Trailer tow (if equipped) Combination switch Trailer turn signal relays
● Remote keyless entry receiver (keyfob)
● Main power window and door lock/unlock switch ● IPDM E/R
Vehicle security system ● Power window and door lock/unlock switch RH ● Security indicator lamp
● Front door lock assembly LH (key cylinder switch)
● All door switches

CAN Communication System Description EKS00AF0

Refer to LAN-25, "CAN COMMUNICATION" .

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 BCM (BODY CONTROL MODULE)

Schematic EKS00AF1

BCS

WKWA3705E

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 BCM (BODY CONTROL MODULE)

WKWA3706E

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 BCM (BODY CONTROL MODULE)

CONSULT-II Function (BCM) EKS00AF2

A
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
BCM diagnostic
Diagnostic mode Content
test item
B
Supports inspections and adjustments. Commands are transmitted to the BCM
WORK SUPPORT for setting the status suitable for required operation, input/output signals are
received from the BCM and received data is displayed.
C
DATA MONITOR Displays BCM input/output data in real time.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
Inspection by part
SELF-DIAG RESULTS Displays BCM self-diagnosis results. D
CAN DIAG SUPPORT
The results of transmit/receive diagnosis of CAN communication can be read.
MNTR
ECU PART NUMBER BCM part number can be read. E
CONFIGURATION Performs BCM configuration read/write functions.

CONSULT–II INSPECTION PROCEDURE F

CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication. G
1. With ignition switch OFF, connect CONSULT-II and CONSULT-II
CONVERTER to data link connector and turn ignition switch ON.
H

J
BBIA0369E

2. Touch “START (NISSAN BASED VHCL)”. BCS

BCIA0029E

3. Touch “BCM” on “SELECT SYSTEM” screen.

If "BCM" is not indicated, go to GI-39, "CONSULT-II Data Link
Connector (DLC) Circuit" .

BCIA0030E

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 BCM (BODY CONTROL MODULE)

4. Select item to be diagnosed on “SELECT TEST ITEM” screen.

LKIA0183E

ITEMS OF EACH PART

NOTE:
CONSULT-II will only display systems the vehicle possesses.
Diagnostic test mode (Inspection by part)
CONSULT-II SELF− CAN DIAG ECU CON-
System and item WORK DATA ACTIVE
display DIAG SUPPORT PART FIGU-
SUPPORT MONITOR TEST
RESULTS MNTR NUMBER RATION
BCM BCM × × × × ×
Power door lock system DOOR LOCK × × ×
REAR
Rear defogger × ×
DEFOGGER
Warning chime BUZZER × ×
Room lamp timer INT LAMP × × ×
Remote keyless entry MULTI REMOTE
× × ×
system ENT
Headlamp HEAD LAMP × × ×
Wiper WIPER × × ×
Turn signal lamp
FLASHER × ×
Hazard lamp
Blower fan switch signal
AIR
Air conditioner switch ×
CONDITIONER
signal
Combination switch COMB SW ×
NVIS (NATS) IMMU × ×
Interior lamp battery BATTERY
× × ×
saver SAVER
Back door TRUNK × ×
Theft alarm THEFT ALM × × ×
Retained accessory
RETAINED PWR × × ×
power control
Oil pressure switch SIGNAL BUFFER × ×
AIR PRESSURE
Air pressure monitor × × × ×
MONITOR
Panic alarm PANIC ALARM ×

WORK SUPPORT
Operation Procedure
1. Touch "BCM" on "SELECT TEST ITEM" screen.
2. Touch "WORK SUPPORT" on "SELECT DIAG MODE" screen.
3. Touch "RESET SETTING VALUE" on "SELECT WORK ITEM" screen.
4. Touch "START".

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 BCM (BODY CONTROL MODULE)

5. "RESET SETTING VALUE OK?" is displayed, and touch "YES".

6. The setting will be changed and "COMPLETED" will be displayed. A
7. Touch "END".
Display Item List B
Item Description
RESET SETTING VALUE Return a value set with WORK SUPPORT of each system to a default value in factory shipment.
C
CAN Communication Inspection Using CONSULT-II (Self-Diagnosis) EKS00AF3

1. SELF-DIAGNOSTIC RESULT CHECK

D
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
E
1. Connect CONSULT–II and CONSULT-II CONVERTER, and select “BCM” on “SELECT SYSTEM” screen.
2. Select “BCM” on “SELECT TEST ITEM” screen, and select “SELF-DIAG RESULTS”.
3. Check display content in self-diagnostic results. F
CONSULT-II display code Diagnosis item
INITIAL DIAG
G
TRANSMIT DIAG
ECM
U1000
IPDM E/R H
METER/M&A
I-KEY
I
Contents displayed
No malfunction>>Inspection end.
Malfunction in CAN communication system>>After printing the monitor items, go to LAN-25, "CAN COMMU-
J
NICATION" .
Configuration EKS00AF4

DESCRIPTION BCS
CONFIGURATION has two functions as follows:
● READ CONFIGURATION is the function to confirm vehicle configuration of current BCM.
● WRITE CONFIGURATION is the function to write vehicle configuration on BCM. L
CAUTION:
● When replacing BCM, you must perform WRITE CONFIGURATION with CONSULT-II.
● Complete the procedure of WRITE CONFIGURATION in order. M
● If you set incorrect WRITE CONFIGURATION, incidents will occur.
● Configuration is different for each vehicle model. Confirm configuration of each vehicle model.
READ CONFIGURATION PROCEDURE
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.

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 BCM (BODY CONTROL MODULE)

1. With ignition switch OFF, connect CONSULT-II and CONSULT-II

CONVERTER to data link connector and turn ignition switch ON.

BBIA0369E

2. Touch “START (NISSAN BASED VHCL)”.

BCIA0029E

3. Touch “BCM” on “SELECT SYSTEM” screen.

If "BCM" is not indicated, go to GI-39, "CONSULT-II Data Link
Connector (DLC) Circuit" .

BCIA0030E

4. Touch “BCM” on “SELECT TEST ITEM” screen.

LKIA0183E

5. Touch “CONFIGURATION” on “SELECT DIAG MODE” screen.

BCIA0031E

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 BCM (BODY CONTROL MODULE)

6. Touch “A60” and "OK" on “VEHICLE SELECT” screen. For can-

celing, touch "CANCEL" on "VEHICLE SELECT" screen. A
NOTE:
Confirm vehicle model. Refer to GI-46, "Model Variation" in GI
section. B

LKIA0613E
D
7. Touch “READ CONFIGURATION” on “SELECT CONFIG ITEM”
screen.
E

G
LKIA0547E

8. Configuration of current BCM is printed out automatically. A list- H

ing of manual setting items and auto setting items will be dis-
played. Auto setting items are preset and cannot be changed.
Manual setting items can be set by using WRITE CONFIGURA-
TION PROCEDURE. Refer to BCS-16, "WRITE CONFIGURA- I
TION PROCEDURE" .

BCS

LKIA0504E

9. Touch “BACK” on “READ CONFIGURATION” screen.

LKIA0395E

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 BCM (BODY CONTROL MODULE)

WRITE CONFIGURATION PROCEDURE

CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. With ignition switch OFF, connect CONSULT-II and CONSULT-II
CONVERTER to data link connector and turn ignition switch ON.

BBIA0369E

2. Touch “START (NISSAN BASED VHCL)”.

BCIA0029E

3. Touch “BCM” on “SELECT SYSTEM” screen.

If "BCM" is not indicated, go to GI-39, "CONSULT-II Data Link
Connector (DLC) Circuit" .

BCIA0030E

4. Touch “BCM” on “SELECT TEST ITEM” screen.

LKIA0183E

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 BCM (BODY CONTROL MODULE)

5. Touch “CONFIGURATION” on “SELECT DIAG MODE” screen.

A

BCIA0031E

D
6. Touch “A60” and "OK" on “VEHICLE SELECT” screen. For can-
celing, touch "CANCEL" on "VEHICLE SELECT" screen.
NOTE: E
Confirm vehicle model. Refer to GI-46, "Model Variation" in GI
section.
F

G
LKIA0613E

7. Touch “WRITE CONFIGURATION” on “SELECT CONFIG

H
ITEM” screen.

LKIA0547E
BCS
8. Touch "YES”.
For canceling, touch "NO".
L

LKIA0175E

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 BCM (BODY CONTROL MODULE)

9. Set by touching selection on "WRITE CONFIGURATION" screen based on the following ITEM LIST.
ITEM SET VAL
KEYLESS ENTRY WITH ⇔ WITHOUT
AUTO LIGHT WITH ⇔ WITHOUT
FR FOG LAMP WITH ⇔ WITHOUT
DTRL WITH ⇔ WITHOUT
DISPLAY STYLE MODE1*1 ⇔ MODE2*2
THEFT ALARM WITH ⇔ WITHOUT
SPEED SENS WIP WITH ⇔ WITHOUT
*1: Without NAVI
*2: With NAVI
Do not apply MODE3 or MODE4.

NOTE:
Confirm vehicle model. Refer to GI-46, "Model Variation" in GI section.

10. Touch "CHNG SETTING" on "WRITE CONFIGURATION" screen.

CAUTION:
Make sure to touch "CHNG SETTING" even if the indicated configuration of new BCM is same as
the desirable configuration.
If not, configuration which is set automatically by selecting vehicle model cannot be memorized.
11. Touch “OK” on "WRITE CONFIGURATION" screen.
If "CANCEL" is touched, it will return to previous screen.

LKIA0397E

12. Wait until the next screen during setting.

LKIA0398E

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 BCM (BODY CONTROL MODULE)

13. WRITE CONFIGURATION results are printed out automatically.

Confirm "WRITE CONFIGURATION" is correctly executed by A
comparing sheet automatically printed out with applicable con-
figuration list shown in step 9.
B

G
LKIA0509E

14. Touch "OK" on "WRITE CONFIGURATION" screen.

WRITE CONFIGURATION is completed. H

LKIA0400E
BCS

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 BCM (BODY CONTROL MODULE)

BCM EKS00AF5

REMOVAL AND INSTALLATION

Removal
NOTE:
If possible, before removing BCM, retrieve current BCM configuration to use for reference when configuring
new BCM after installation. Refer to BCS-13, "Configuration" .
1. Disconnect battery negative cable.
2. Remove lower knee bolster. Refer to IP-10, "Removal and Installation" .
3. Remove screw and release BCM.
4. Disconnect connectors and then remove BCM.

LEIA0068E

Installation
Install in the reverse order of removal.
NOTE:
● When replacing BCM, it must be configured. Refer to BCS-13, "Configuration" .
● When replacing BCM, perform initialization of NATS system and registration of all NATS ignition key IDs.
Refer to BL-139, "NVIS(NISSAN Vehicle Immobilizer System-NATS)" .
● When replacing BCM, perform ID registration procedure of low tire pressure warning system. Refer to
WT-15, "ID Registration Procedure" .

Revision: October 2006 BCS-20 2006 Titan