2011 INFINITI QX56 light

WCS
COMBINATION METERWCS-23
< ECU DIAGNOSIS INFORMATION >
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LIGHT IND Ignition switch
ONTail lamp indicator lamp ON On
Tail lamp indicator lamp OFF Off
OIL W/L Ignition switch
ONOil pressure warning lamp ON On
Oil pressure warning lamp OFF Off
MIL Ignition switch
ONMalfunction indicator lamp ON On
Malfunction indicator lamp OFF Off
GLOW IND Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
CRUISE IND Ignition switch
ONCRUISE indicator ON On
CRUISE indicator OFF Off
SET IND Ignition switch
ONSET indicator ON On
SET indicator OFF Off
CRUISE W/L Ignition switch
ONCRUISE warning lamp ON On
CRUISE warning lamp OFF Off
BA W/L Ignition switch
ONIBA OFF indicator lamp ON On
IBA OFF indicator lamp OFF Off
AT C / T - A M T W / L Ignition switch
ONA/T check warning lamp ON On
A/T check warning lamp OFF Off
ATF TEMP W/L Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
4WD W/L Ignition switch
ON4WD warning lamp ON On
4WD warning lamp OFF Off
FUEL W/L Ignition switch
ONDuring low fuel warning indication On
Other than the above Off
WASHER W/L Ignition switch
ONDuring low washer fluid warning indication On
Other than the above Off
AIR PRES W/L Ignition switch
ONLow tire pressure
warning lamp ON On
Low tire pressure warning lamp OFF Off
KEY G/Y W/L Ignition switch
ONKEY warning lamp (G
reen/Yellow) ON On
KEY warning lamp (G reen/Yellow) OFF Off
KEY KNOB W/L Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
AFS OFF IND Ignition switch
ONAFS OFF indicator lamp ON On
AFS OFF indicator lamp OFF Off
DDS W/L Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
LANE W/L Ignition switch
ONLane departure warning lamp ON On
Lane departure warning lamp OFF Off
LDP IND Ignition switch
ONLDP ON indicator lamp ON On
LDP ON indicator lamp OFF Off
AT P W / L Ignition switch
ONATP warning lamp ON On
AT P w a r n i n g l a m p O F F O f f
Monitor Item Condition Value/Status
Revision: 2010 May2011 QX56

WCS-40
< DTC/CIRCUIT DIAGNOSIS >
METER BUZZER CIRCUIT
METER BUZZER CIRCUIT
Component Function CheckINFOID:0000000006222528
1.CHECK OPERATION OF METER BUZZER
1. Select “BUZZER” of “BCM” on CONSULT-III.
2. Perform “LIGHT WARN ALM” of “Active Test”.
Does meter buzzer beep?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK COMBINATION METER INPUT SIGNAL
Select the “Data Monitor” for the “METER/M&A” and check the “BUZZER” monitor value.
Is the inspection result normal?
YES >> Replace combination meter.
NO >> Replace BCM. Refer to BCS-81, "
Removal and Installation".
Diagnosis ProcedureINFOID:0000000006222529
1.CHECK POWER SUPPLY OF COMBINATION METER
Check power supply of combination meter. Refer to MWI-64, "
COMBINATION METER : Diagnosis Proce-
dure".
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair power supply circuit of combination meter.
BUZZER
Under the condition of buzzer input : On
Except above : Off
Revision: 2010 May2011 QX56

WCS-44
< SYMPTOM DIAGNOSIS >
THE LIGHT REMINDER WARNING DOES NOT SOUND
SYMPTOM DIAGNOSIS
THE LIGHT REMINDER WARNING DOES NOT SOUND
DescriptionINFOID:0000000006222532
Light reminder warning chime does not sound even though headlamp is illuminated.
Diagnosis ProcedureINFOID:0000000006222533
1.CHECK COMBINATION SWITCH (LIGHTING SWITCH) OPERATION
Check that the headlamps operate normally by operat ing the combination switch (lighting switch).
Do they operate normally?
YES >> GO TO 2.
NO >> Refer to EXL-113, "
Symptom Table".
2.CHECK DRIVER SIDE DOOR SWITCH SIGNAL CIRCUIT
Perform the check for the driver side door switch signal circuit. Refer to DLK-117, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK DRIVER SIDE DOOR SWITCH
Perform a unit check for the driver side door switch. Refer to DLK-119, "
Component Inspection".
Is the inspection result normal?
YES >> Replace BCM. Refer to BCS-81, "Removal and Installation".
NO >> Replace driver side door switch. Refer to DLK-254, "
Removal and Installation".
Revision: 2010 May2011 QX56

WW-2
FRONT WIPER MOTOR GROUND CIRCUIT ...39
Diagnosis Procedure ..............................................39
LIGHT & RAIN SENSOR ...................................40
Component Function Check ................................ ...40
Diagnosis Procedure ..............................................40
WASHER SWITCH ............................................42
Component Inspection ......................................... ...42
REAR WIPER MOTOR CIRCUIT ......................43
Component Function Check ................................ ...43
Diagnosis Procedure ..............................................43
REAR WIPER AUTO STOP SIGNAL CIRCUIT
...
45
Component Function Check ................................ ...45
Diagnosis Procedure ..............................................45
HEADLAMP WASHER RELAY .........................46
Component Inspection ......................................... ...46
HEADLAMP WASHER CIRCUIT ......................47
Component Function Check ................................ ...47
Diagnosis Procedure ..............................................47
SYMPTOM DIAGNOSIS .............................49
WIPER AND WASHER SYSTEM SYMPTOMS
...
49
Symptom Table ................................................... ...49
NORMAL OPERATING CONDITION ................52
Description ........................................................... ...52
FRONT WIPER DOES NOT OPERATE ............53
Description ........................................................... ...53
Diagnosis Procedure ..............................................53
REMOVAL AND INSTALLATION ...............55
HEADLAMP WASHER NOZZLE AND TUBE ...55
Exploded View ..................................................... ...55
Hydraulic Layout .....................................................55
Removal and Installation ........................................56
Inspection ...............................................................56
WASHER TANK ............................................. ...58
Exploded View ..................................................... ...58
Removal and Installation ........................................58
WASHER PUMP ................................................60
Exploded View ..................................................... ...60
Removal and Installation .........................................60
HEADLAMP WASHER PUMP ..........................61
Exploded View ..................................................... ...61
Removal and Installation .........................................61
WASHER LEVEL SWITCH ...............................62
Removal and Installation ...................................... ...62
FRONT WASHER NOZZLE AND TUBE ...........63
Exploded View ..................................................... ...63
Hydraulic Layout .....................................................63
Removal and Installation .........................................64
Inspection and Adjustment ......................................64
FRONT WIPER ARM .........................................66
Exploded View ..................................................... ...66
Removal and Installation .........................................66
Adjustment ..............................................................66
FRONT WIPER BLADE .....................................68
Exploded View ..................................................... ...68
Removal and Installation .........................................68
Replacement ...........................................................68
FRONT WIPER DRIVE ASSEMBLY .................70
Exploded View ..................................................... ...70
Removal and Installation .........................................70
Disassembly and Assembly ....................................71
LIGHT & RAIN SENSOR ...................................72
Exploded View ..................................................... ...72
Removal and Installation .........................................72
WIPER AND WASHER SWITCH ......................73
Exploded View ..................................................... ...73
REAR WIPER ARM ...........................................74
Exploded View ..................................................... ...74
Removal and Installation .........................................74
Adjustment ..............................................................74
REAR WIPER MOTOR ......................................76
Exploded View ..................................................... ...76
Removal and Installation .........................................76
REAR WASHER NOZZLE AND TUBE .............77
Hydraulic Layout .................................................. ...77
Removal and Installation .........................................77
Inspection and Adjustment ......................................78
Revision: 2010 May2011 QX56

COMPONENT PARTSWW-5
< SYSTEM DESCRIPTION >
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006300448
1. IPDM E/R Refer to PCS-4, "
Component Parts
Location"
2. BCM
Refer to BCS-4, "
BODY CONTROL
SYSTEM : Component Parts Loca-
tion"
3. TCM
Refer to TM-10, "
A/T CONTROL
SYSTEM : Componen t Parts Loca-
tion"
4. Light & rain sensor 5. Combination switch 6. Washer level switch
7. Washer pump 8. Headlamp washer pump 9. Headlamp washer relay
10. Front wiper motor 11. Rear wiper motor
A. Behind front fender protector (RH) B. Engine room (LH) C. Cowl top, left side of engine room
D. Back door finisher inside
JMLIA0976ZZ
Revision: 2010 May2011 QX56

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< SYSTEM DESCRIPTION >
COMPONENT PARTS
Component Description
INFOID:0000000006300449
Washer SwitchINFOID:0000000006300450
 Washer switch is integrated combination switch.
 Combination switch switches polarity between front washer operating and rear washer operating to supply
power to the washer pump on ground.
Part Description
IPDM E/R  Controls the integrated relay according to the request (via CAN communication) from BCM.
 Performs the auto stop control of the front wiper.
BCM  Judges the each switch status by the combination switch reading function.
 Requests (via CAN communication) the front wiper relay and the front wiper high relay ON to
IPDM E/R.
 Supplies power to the rear wiper motor.
 Performs the auto stop control of the rear wiper.
 Requests (via CAN communication) the headlamp washer relay ON to IPDM I/R.
TCM Transmits the shift position signal to BCM via CAN communication.
Light & rain sensor Detects water droplets on the windshield with infrared rays, and transmits the rain sensor signal
to BCM via the rain sensor serial link.
Combination switch
(Wiper & washer switch) Refer to
BCS-7, "
COMBINATION SWITCH READING S YSTEM : System Description".
Washer switch Refer to WW-6, "
Washer Switch".
Washer pump  Washer fluid is sprayed according to washer switch states.
 Switching between front washer and rear washer is performed according to the voltage polarity
change to washer pomp.
Headlamp washer pump Washer fluid is sprayed according to washer switch states and headlamp switch status.
Front wiper motor  IPDM E/R controls front wiper operation.
 Front wiper auto stop signal is transmitted to IPDM E/R.
Rear wiper motor  BCM controls rear wiper operation.
 Rear wiper auto stop signal is transmitted to BCM.
Combination meter Transmits the vehicle speed signal to BCM via CAN communication.
JPLIA0163GB
Revision: 2010 May2011 QX56

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< SYSTEM DESCRIPTION >
SYSTEM
FRONT WIPER AUTO OPERATION
Rain Detection
Rain level and sensor conditions are detected by light & rain sensor.
 BCM transmits the vehicle conditions (vehicle speed, front wiper condition, rain sensor sensitivity setting,
etc.) to the light & rain sensor via the rain sensor serial link.
 Light & rain sensor judges a wiping speed for front wi per by rain condition and the vehicle conditions. And it
transmits the wiping speed request signal to t he BCM via the rain sensor serial link.
Auto Wiping Operation
 BCM receives the wiping speed request signal from the light & rain sensor via the rain sensor serial link.
 BCM controls front wiper operation according to t he wiping speed request signals. And it transmits the front
wiper request signals (LO or HI) to the IPDM E/R via CAN communication line.
Front wiper AUTO operating condition
- Ignition switch ON
- Front wiper switch AUTO
NOTE:
When the front wiper switch is turned to AUTO positi on, front wiper operates once regardless of rainy condi-
tions.
Rain Sensor Sensitivity Setting
BCM determines rain sensor sensitivity according to wiper volume dial position.
NOTE:
When the wiper volume dial position is turned up by 1 level under front wiper AUTO operating condition, front
wiper operates once.
Splash mode operation
Front wiper is operated at HI regardl ess of the wiper volume adjustment position, when water drops are instan-
taneously sprayed over the windshield glass due to wate r splash from oncoming vehicles or other causes.
After that, AUTO operation is performed depending on the amount of water drops.
SPLASH MODE OPERATION CONDITIONS Front wiper switch AUTO
 Ignition switch ON
NOTE:
Splash mode is not operated and auto wiping operati on is performed, while the vehicle is stopped.
FRONT WIPER AUTO STOP OPERATION
 BCM stops transmitting the front wiper request signal when the front wiper switch is turned OFF.
 IPDM E/R detects the front wiper stop position signal from the front wiper motor and detects the front wiper
motor position (stop position/except stop position).
Wiper volume dial position Sensitivity
1 High sensitivity
2
3 Medium−high sensitivity
4
5 Low−medium sensitivity
6
7 Low sensitivity
Revision: 2010 May2011 QX56

SYSTEMWW-9
< SYSTEM DESCRIPTION >
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 When the front wiper request signal is stopped, IPDM E/R turns ON the front wiper relay until the front wiper
motor returns to the stop position.
NOTE:
 BCM stops the transmitting of the front wiper request signal when the ignition switch is OFF.
 IPDM E/R turns the front wiper relay OFF when the ignition switch is OFF.
FRONT WIPER OPERATION LINKED WITH WASHER
 BCM transmits the front wiper request signal (LO) to IPDM E/R via CAN communication according to the
washer linked operating condition of the front wiper.
 BCM transmits the front wiper request signal (LO) so that the front wiper operates approximately 2 times
when the front washer switch OFF is detected.
Washer linked operating condition of front wiper
- Ignition switch ON
- Front washer switch ON (0.4 second or more)
 IPDM E/R turns ON the integrated front wiper rela y according to the front wiper request signal (LO).
 The washer pump is grounded through the combinati on switch with the front washer switch ON.
FRONT WIPER DROP WIPE OPERATION
 BCM controls the front wiper to operate once according to the conditions of front wiper drop wipe operation.
Front wiper drop wipe operating condition
- Ignition switch ON
- Front wiper switch OFF
- Front washer switch OFF
 BCM transmits the front wiper request signal (LO) to IPDM E/R with CAN communication so that the front
wiper operate once three seconds after fr ont wiper operation linked with washer.
 IPDM E/R turns ON the integrated front wiper rela y according to the front wiper request signal (LO).
WIPER LINKED AUTO LIGHTING FUNCTION
When light switch is in the AUTO position, front wiper operates, and then headlamp illuminates. Refer to EXL-
11 , "AUTO LIGHT SYSTEM : System Description (For CANADA)" or EXL-12, "AUTO LIGHT SYSTEM : Sys-
tem Description (Except for CANADA)".
FRONT WIPER AND WASHER SYSTEM : Fail-safeINFOID:0000000006300453
IPDM E/R
When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With BCM
JPLIA0410GB
Revision: 2010 May2011 QX56