2010 INFINITI QX56 ECU

AV-152
< ECU DIAGNOSIS >[AUDIO SYSTEM]
REAR VIEW CAMERA CONTROL UNIT
REAR VIEW CAMERA CONTROL UNIT
Reference ValueINFOID:0000000005146350
TERMINAL LAYOUT
PHYSICAL VALUES
WKIA5224E
Te r m i n a l
(wire color) Description
ConditionReference value
(Approx.)
+ – Signal nameInput/
Output
1
(Y) Ground Battery power
InputIgnition
switch
OFF —
Battery voltage
2
(V) Ground ACC power
InputIgnition
switch ACC —
Battery voltage
3
(B) Ground Ground
—Ignition
switch
ON —0
V
4
(G/W) Ground Reverse signal input
InputIgnition
switch ON A/T selector lever R
position
Battery voltage
A/T selector lever in
other than R position 0V
5
(BR) Ground AV Control
OutputIgnition
switch ON —0
V
6
(G/W) Ground DDL
Output ———
8
(Y) Ground Camera power output Output Ignition
switch ON A/T selector lever R
position
6V
9 Ground Camera image input (–) Input Ignition
switch
ON —0
V
10
(G) Ground Camera image input (+) Input Ignition
switch
ON A/T selector lever R
position
SKIA4894E
Revision: April 20092010 QX56

AV
REAR VIEW CAMERA CONTROL UNITAV-153
< ECU DIAGNOSIS > [AUDIO SYSTEM]
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(B) Ground Composite image output (-) Output Ignition
switch ON A/T selector lever R
position
12
(W) Ground Composite image output (+) Output Ignition
switch ON A/T selector lever R
position
Te r m i n a l
(wire color) Description
ConditionReference value
(Approx.)
+ – Signal nameInput/
Output
SKIA4896E
SKIA4896E
Revision: April 20092010 QX56

AV-154
< ECU DIAGNOSIS >[AUDIO SYSTEM]
DVD PLAYER
DVD PLAYER
Reference ValueINFOID:0000000005146351
PHYSICAL VALUES
AWNIA1876ZZ
Terminal
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal nameInput/
Output
1
(W) 2
(B) DVD audio signal LH Output Ignition
switch ON With operation of the DVD
player
3—Shield —— — —
5
(B) Ground Ground
—Ignition
switch ON —0
V
6
(BR) Ground Illumination control (pulse
width modulated) — — With lighting switch ON
—
7
(W/L) Ground Can communication Input/
Output Ignition
switch ON ——
9
(SB) Ground
Video monitor power sup-
ply OutputIgnition
switch
ON With DVD player operation
Battery voltage
10
(G/Y) Ground Switch power
OutputIgnition
switch ON With DVD player operation
5V
12
(B/W) Ground VTR (+)
OutputIgnition
switch ON With DVD player operation
—
13
(L) Ground VTR (-)
OutputIgnition
switch
ON With DVD player operation
—
14
(B/W) Ground Display ground
—Ignition
switch ON With DVD player operation
0V
16
(Y) — Data receive
Input —— —
SKIB3609E
Revision: April 20092010 QX56

AV
DVD PLAYERAV-155
< ECU DIAGNOSIS > [AUDIO SYSTEM]
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(R) 18
(G) DVD audio signal RH Output Ignition
switch ON With DVD player operation
21
(Y) Ground Battery power
Input ——Battery voltage
22
(R/L) Ground Illumination power
Input —With instrument illumination
ON Battery voltage
23
(P/B) Ground CAN communication
Input/
Output Ignition
switch
ON —0
V
24
(V) Ground ACC power
InputIgnition
switch
ACC or
ON —
Battery voltage
25
(BR) Ground Video monitor power Output Ignition
switch ON With DVD player operation
Battery voltage
26
(B/Y) Ground Video monitor ground Input Ignition
switch ON With instrument illumination
ON 0V
28
(B/W) Ground Video out
InputIgnition
switch
ACC or
ON —
30 — Shield — — ——
32
(BR) — Data transmit
Output ———
Te r m i n a l
(Wire color) Description
ConditionReference value
(Approx.)
+ – Signal nameInput/
Output
SKIB3609E
SKIB2251J
Revision: April 20092010 QX56

AV-158
< SYMPTOM DIAGNOSIS >[AUDIO SYSTEM]
NORMAL OPERATING CONDITION
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000005146353
AUDIO SYSTEM
The majority of the audio troubles are the result of
outside causes (bad CD, electromagnetic interference,
etc.).
Noise
The following noise results from variations in field strength, such as fading noise and multi-path noise, or
external noise from trains and other sources. It is not a malfunction.
• Fading noise: This noise occurs because of variations in the field strength in a narrow range due to moun-
tains or buildings blocking the signal.
• Multi-path noise: This noise results from the waves s ent directly from the broadcast station arriving at the
antenna at a different time from the waves which reflect off mountains or buildings.
The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunctioning.
Check if noise is caused and/or changed by engine speed, ignition switch turned to each position, and opera-
tion of each piece of electrical equipment, and determine the cause.
NOTE:
The source of the noise can be found easily by listening to the noise while removing the fuses of electrical
components, one by one.
Type of Noise and Possible Cause
NAVIGATION SYSTEM
Basic Operation
Vehicle Mark
Occurrence condition Possible cause
Occurs only when engine is ON. A continuous growling noise occurs. The speed of
the noise varies with changes in the engine speed. • Ignition components
The occurrence of the noise is linked with the operation of the fuel pump. • Fuel pump condenser
Noise only occurs when various
electrical components are oper-
ating. A cracking or snapping sound occurs with the op-
eration of various switches.
• Relay malfunction, AV control unit malfunc-
tion
The noise occurs when various motors are operat-
ing. • Motor case ground
• Motor
The noise occurs constantly, not just under certain conditions. • Rear defogger coil malfunction
• Open circuit in printed heater
• Poor ground of antenna feeder line
A cracking or snapping sound occurs while the vehicle is being driven, especially when
it is vibrating excessively. • Ground wire of body parts
• Ground due to improper part installation
• Wiring connections or a short circuit
Symptom
Cause Remedy
No image is shown. Display brightness adjustment is set fully to DARK
side. Adjust the display brightness.
No guide sound is heard.
Audio guide volume is too low or
too high. Volume control is set to OFF, MIN or MAX. Adjust the audio guide volume.
Audio guidance is not available while the vehicle is
driving on a dark pink route.
System is not malfunctioning.
Screen is too dark.
Motion of the image is too slow. Temperature inside the vehicle is low.
Wait until the temperature inside the vehicle
reaches the proper temperature.
Small black or bright spots appear
on the screen. Symptom peculiar to a liquid crystal display (dis-
play unit). System is not malfunction.
Revision: April 20092010 QX56

BCS-2
COMB SW .................................................................25
COMB SW : CONSULT-III Function (BCM -
COMB SW) .............................................................
25
IMMU ...................................................................... ...26
IMMU : CONSULT-III Function (BCM - IMMU) .......26
BATTERY SAVER ................................................. ...26
BATTERY SAVER : CONSULT-III Function (BCM
- BATTERY SAVER) ........................................... ...
26
TRUNK ................................................................... ...27
TRUNK : CONSULT-III Function (BCM - TRUNK) ...27
RETAINED PWR .................................................... ...27
RETAINED PWR : CONSULT-III Function (BCM -
RETAINED PWR) ...................................................
27
SIGNAL BUFFER ................................................... ...27
SIGNAL BUFFER : CONSULT-III Function (BCM
- SIGNAL BUFFER) ................................................
28
AIR PRESSURE MONITOR ................................... ...28
AIR PRESSURE MONITOR : Diagnosis Descrip-
tion ..........................................................................
28
AIR PRESSURE MONITOR : CONSULT-III Func-
tion ....................................................................... ...
30
THEFT ALM ........................................................... ...30
THEFT ALM : CONSULT-III Function (BCM -
THEFT ALM) ..........................................................
30
PANIC ALARM ....................................................... ...31
PANIC ALARM : CONSULT-III Function (BCM -
PANIC ALARM) ................................................... ...
31
COMPONENT DIAGNOSIS ........................32
U1000 CAN COMM CIRCUIT ......................... ...32
Description ........................................................... ...32
DTC Logic ...............................................................32
Diagnosis Procedure ..............................................32
POWER SUPPLY AND GROUND CIRCUIT .....33
Diagnosis Procedure ........................................... ...33
COMBINATION SWITCH INPUT CIRCUIT .......35
Diagnosis Procedure ............................................ ...35
Special Repair Requirement ...................................36
COMBINATION SWITCH OUTPUT CIRCUIT ...37
Diagnosis Procedure ...............................................37
Special Repair Requirement ...................................37
COMBINATION SWITCH ..................................38
Description ........................................................... ...38
Diagnosis Procedure ...............................................38
ECU DIAGNOSIS .......................................40
BCM (BODY CONTROL MODULE) ............... ...40
Reference Value .................................................. ...40
Terminal Layout ......................................................43
Physical Values .......................................................43
Wiring Diagram .......................................................49
Fail Safe .................................................................53
DTC Inspection Priority Chart ...............................54
DTC Index ..............................................................54
SYMPTOM DIAGNOSIS ............................56
COMBINATION SWITCH SYSTEM SYMP-
TOMS .............................................................. ...
56
Symptom Table .................................................... ...56
PRECAUTION ............................................57
PRECAUTIONS .............................................. ...57
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. ...
57
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ..................................
57
ON-VEHICLE REPAIR ...............................59
BCM (BODY CONTROL MODULE) ............... ...59
Removal and Installation .........................................59
Revision: April 20092010 QX56

BCS
BODY CONTROL SYSTEMBCS-5
< FUNCTION DIAGNOSIS > [BCM]
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FUNCTION DIAGNOSIS
BODY CONTROL SYSTEM
System DescriptionINFOID:0000000005146384
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-15, "System Diagram"
Headlamp systemEXL-14, "System Diagram"
Front fog lamp systemEXL-14, "System Diagram"
Daytime running light system (if equipped)EXL-9, "System Diagram"
Interior room lamp control systemINL-6, "System Diagram"
Step lamp systemINL-6, "System Diagram"
Interior room lamp battery saver systemINL-6, "System Diagram"
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-14, "DOOR LOCK AND UNLOCK SWITCH : System Diagram"
(NATS) Nissan anti-theft systemSEC-14, "System Diagram"
Vehicle security systemSEC-18, "System Diagram"
Rear window defogger systemDEF-4, "System Diagram"
Intelligent Key systemSEC-10, "System Diagram"
Power window systemPWC-5, "SystemDiagram"
RAP (retained accessory power) systemBCS-27, "RETAINED PWR : CONSULT-III Function (BCM - RETAINED
PWR)"
TPMS (tire pressure monitoring system)
BCS-30, "AIR PRESSURE MONITOR : CONSULT-III Function"
Revision: April 20092010 QX56

BCS-14
< FUNCTION DIAGNOSIS >[BCM]
POWER CONSUMPTION CONTROL SYSTEM
Sleep condition
Wake-up operation
• BCM transmits sleep wake up signal (wake up) to each unit when any condition listed below is established,
and then goes into normal mode from low power consumption mode.
• Each unit starts transmissions with CAN communication by receiving sleep wake up signals. Each unit trans- mits wake up signals to BCM with CAN communication to convey the start of CAN communication.
Wake-up condition
CAN sleep condition BCM sleep condition
• Receiving the sleep-ready signal (ready) from all units
• Ignition switch: OFF
• Vehicle security system alarm: No operation
• Warning lamp: No operation
• Warning chime: No operation
• Stop lamp switch: OFF
• Key switch status: No change for 2 seconds
• Hazard warning lamp: No operation
•Exterior lamp: OFF
• Door lock status: No change for 2 seconds
• CONSULT-III communication status: No communication
• Door switch status: No change for 2 seconds The controls only BCM are completed.
(Interior room lamp battery saver: Time out etc.)
BCM wake-up condition
• Ignition switch: OFF → ACC or ON
• Stop lamp switch: ON (Depress brake pedal)
• Any door switch: OFF → ON
• Lighting switch: OFF → 1ST or PASS
• Hazard switch: OFF → ON
• Back door opener switch OFF → ON
• Remote keyless entry receiver: Receiving
• Intelligent Key unit: Receiving
Revision: April 20092010 QX56