2008 INFINITI QX56 Factory Service Manual

battery location jump start terminals winter tyres snow chains horn child seat

Page 369 of 4083

INFINITI QX56 2008 Factory Service Manual BCS-4
< BASIC INSPECTION >[BCM]
INSPECTION AND ADJUSTMENT
• When replacing BCM, you must perform WRITE CONFIGURATION
with CONSULT-III.
• Complete the procedure of WRITE CONFIGURATION in order.
�

Page 370 of 4083

INFINITI QX56 2008 Factory Service Manual BCS
BODY CONTROL SYSTEMBCS-5
< FUNCTION DIAGNOSIS > [BCM]
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FUNCTION DIAGNOSIS
BODY CONTROL SYSTEM
System DescriptionINFOID:0000000001696402
OUTLINE
• BCM (Body Control M

BCS
BODY CONTROL SYSTEMBCS-5
< FUNCTION DIAGNOSIS > [BCM]
C
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FUNCTION DIAGNOSIS
BODY CONTROL SYSTEM
System DescriptionINFOID:0000000001696402
OUTLINE
• BCM (Body Control Module) controls the various electrical components. It inputs the information required to
the control from CAN communication and the signal received from each switch and sensor.
• BCM has combination switch reading function for reading the operation status of combination switches (light,
turn signal, wiper and washer) in addition to a function fo r controlling the operation of various electrical com-
ponents. It also has the signal transmission function as the passed point of signal and the power consump-
tion control function that reduces the power consumption with the ignition switch OFF.
• BCM is equipped with the diagnosis function that perfo rms the diagnosis with CONSULT-III and various set-
tings.
BCM control function list
System Refer to
Combination switch reading system BCS-7, "
System Diagram"
Signal buffer systemBCS-12, "System Diagram"
Power consumption control systemBCS-13, "System Diagram"
Auto light systemEXL-11, "System Diagram"
Turn signal and hazard warning lamp systemEXL-16, "System Diagram"
Headlamp systemEXL-7, "System Diagram"
Front fog lamp systemEXL-15, "System Diagram"
Daytime running light systemEXL-9, "System Diagram"
Interior room lamp control systemINL-6, "System Diagram"
Step lamp systemINL-6, "System Diagram"
Interior room lamp battery saver systemINL-13, "BATTERY SAVER : CONSULT-III Function"
Front wiper and washer systemWW-4, "System Diagram"
Rear wiper and washer systemWW-8, "System Diagram"
Warning chime systemWCS-4, "WARNING CHIME SYSTEM : System Diagram"
Door lock system DLK-10, "DOOR LOCK AND UNLOCK SWITCH : System Diagram"
(NATS) Nissan anti-theft systemSEC-13, "System Diagram"
Vehicle security systemSEC-17, "System Diagram"
Rear window defogger systemDEF-4, "System Diagram"
Intelligent Key systemSEC-9, "System Diagram"
Power window systemPWC-5, "SystemDiagram"
RAP (retained accessory power) systemBCS-26, "RETAINED PWR : CONSULT-III Function (BCM - RETAINED
PWR)"
TPMS (tire pressure monitoring system)
BCS-28, "AIR PRESSURE MONITOR : CONSULT-III Function"
Revision: March 2010 2008 QX56

Page 371 of 4083

INFINITI QX56 2008 Factory Service Manual BCS-6
< FUNCTION DIAGNOSIS >[BCM]
BODY CONTROL SYSTEM
Component Parts Location
INFOID:0000000001696403
• BCM M18, M19, M20 (view wit h instrument panel removed)
LEIA0068E
Revision: March 2010 2008 Q

Page 372 of 4083

INFINITI QX56 2008 Factory Service Manual BCS
COMBINATION SWITCH READING SYSTEMBCS-7
< FUNCTION DIAGNOSIS > [BCM]
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B A
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COMBINATION SWITCH
READING SYSTEM
System DiagramINFOID:0000000001696404
System DescriptionINFOID:

Page 373 of 4083

INFINITI QX56 2008 Factory Service Manual BCS-8
< FUNCTION DIAGNOSIS >[BCM]
COMBINATION SWITCH READING SYSTEM
Combination switch circuit
Combination switch INPUT-OUTPUT system list
NOTE:
Headlamp has a dual system switch.
COMBINATION SWITCH R

Page 374 of 4083

INFINITI QX56 2008 Factory Service Manual BCS
COMBINATION SWITCH READING SYSTEMBCS-9
< FUNCTION DIAGNOSIS > [BCM]
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- The voltage waveform of INPUT corresponding to the
formed circuit changes according to the oper

Page 375 of 4083

INFINITI QX56 2008 Factory Service Manual BCS-10
< FUNCTION DIAGNOSIS >[BCM]
COMBINATION SWITCH READING SYSTEM
• The circuits between INPUT 1 and OUTPUT 5 and between INPUT 1 and OUTPUT 3 are formed when the
TURN RH switch and FR WIPER LOW

Page 376 of 4083

INFINITI QX56 2008 Factory Service Manual BCS
COMBINATION SWITCH READING SYSTEMBCS-11
< FUNCTION DIAGNOSIS > [BCM]
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1. BCM M18, M19, M20 (view with in-
strument panel removed) 2. Combination switch (lighting and

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