2011 INFINITI QX56 turn signal

REAR A/C CONTROL COMMUNICATION SIGNAL
HAC-127
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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REAR A/C CONTROL COMMUNICATION SIGNAL
Diagnosis ProcedureINFOID:0000000006275975
1.CHECK COMMUNICATION SIGNAL CIRCUIT (A/C AUTO AMP. → REAR A/C CONTROL) FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect rear A/C contro l and A/C auto amp. connector.
3. Check continuity between rear A/C control har ness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK COMMUNICATION SIGNAL CIRCUIT (A/C AUTO AMP. → REAR A/C CONTROL) FOR SHORT
Check continuity between rear A/ C control harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK COMMUNICATION SIGNAL CIRCUIT (REAR A/C CONTROL → A/C AUTO AMP.) CIRCUIT FOR
OPEN
Check continuity between rear A/C control har ness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK COMMUNICATION SIGNAL CIRCUIT (REAR A/C CONTROL → A/C AUTO AMP.) CIRCUIT FOR
SHORT
Check continuity between rear A/ C control harness connector and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
Rear A/C control A/C auto amp. Continuity
Connector Terminal Connector Terminal
M419M5011 Existed
Rear A/C control —Continuity
Connector Terminal
M41 9 Ground Not existed
Rear A/C control A/C auto amp. Continuity
Connector Terminal Connector Terminal
M4110M5031 Existed
Rear A/C control —Continuity
Connector Terminal
M41 10 Ground Not existed
Revision: 2010 May2011 QX56

REAR BLOWER MOTORHAC-131
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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REAR BLOWER MOTOR
Diagnosis ProcedureINFOID:0000000006275978
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 20A fuse [No. 16, located in fuse block (J/B)]. NOTE:
Refer to PG-140, "
Fuse, Connector and Terminal Arrangement".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK REAR BLOWER MOTOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect rear blower motor connector.
3. Turn ignition switch ON.
4. Check voltage between rear blower motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector between rear blower motor and fuse block (J/B).
3.CHECK REAR BLOWER MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear blower motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK REAR BLOWER MOTOR CONTROL SIGNAL CIRCUIT
1. Disconnect A/C auto amp. connector.
2. Check continuity between rear blower motor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair harness or connector.
5.CHECK REAR BLOWER MOTOR CONTROL SIGNAL
1. Reconnect rear blower motor connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Operate MODE switch to set air outlet to VENT.
+
−Vol tag e
Rear blower motor
Connector Terminal M302 1 Ground Battery voltage
Rear blower motor —Continuity
Connector Terminal
M302 3 Ground Existed
Rear blower motor A/C auto amp. Continuity
Connector Terminal Connector Terminal
M302 2 M50 34 Existed
Revision: 2010 May2011 QX56

HAC-132
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
REAR BLOWER MOTOR
4. Change fan speed from Lo to Hi, and check duty rati
os between rear blower motor harness connector and
ground by using an oscilloscope.
NOTE:
Calculate drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms
Is the inspection result normal?
YES >> Replace rear blower motor. Refer to VTL-16, "REAR A/C UNIT ASSEMBLY : Removal and Instal-
lation".
NO >> Replace A/C auto amp.. Refer to HAC-146, "
Removal and Installation".
Component InspectionINFOID:0000000006275979
1.CHECK REAR BLOWER MOTOR-I
1. Remove rear blower motor.
2. Check that there is not any mixing foreign object in the rear blower motor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace rear blower motor. Refer to VTL-16, "
REAR A/C UNIT ASSEMBLY : Removal and Instal-
lation".
2.CHECK REAR BLOWER MOTOR-II
Check that there is not breakage or damage in the rear blower motor.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Replace rear blower motor. Refer to VTL-16, "
REAR A/C UNIT ASSEMBLY : Removal and Instal-
lation".
3.CHECK REAR BLOWER MOTOR-III
Check that rear blower motor turns smoothly.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace rear blower motor. Refer to VTL-16, "
REAR A/C UNIT ASSEMBLY : Removal and Instal-
lation".
Rear blower motor Condition
Duty ratio
(Approx.)
Connector Terminal Fan speed (manual)
VENT mode
M272 2 1st 25 %
2nd 33 % 3rd 41 %4th 51 %
5th 61 %
6th 69 %
7th 81 %
JPLIA1210GB
Revision: 2010 May2011 QX56

HAC-138
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
INSUFFICIENT COOLING
INSUFFICIENT COOLING
FRONT AIR CONDITIONER
FRONT AIR CONDITIONER : DescriptionINFOID:0000000006275984
Symptom Insufficient cooling
 No cool air comes out. (Air flow volume is normal.)
FRONT AIR CONDITIONER
: Diagnosis ProcedureINFOID:0000000006275985
NOTE:
Perform self-diagnoses with CONSULT-III before perform ing symptom diagnosis. If any DTC is detected, per-
form the corresponding diagnosis.
1.CHECK MAGNET CLUTCH OPERATION
1. Turn ignition switch ON.
2. Operate fan switch.
3. Press A/C switch.
4. Check that A/C indicator turns ON. Check visually and by sound that compressor operates.
5. Press A/C switch again.
6. Check that A/C indicator turns OFF. Check that compressor stops.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Perform diagnosis of “COMPRESSOR DOSE NOT OPERATE” in “SYMPTOM DIAGNOSIS”.
Refer to HAC-142, "
Diagnosis Procedure".
2.CHECK DRIVE BELT
Check tension of drive belt. Refer to EM-20, "
Checking".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Adjust or replace drive belt depending on the inspection results.
3.CHECK REFRIGERANT CYCLE
Connect recovery/recycling recharging equipment to the vehicle and perform pressure inspection with gauge.
Refer to HA-27, "
Symptom Table".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace parts depending on the inspection results.
4.CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of the fr ont air conditioning system for leakage.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace parts depending on the inspection results.
5.CHECK AMBIENT TEMPERATURE DISPLAY
Check that there is not much diference between act ual ambient temperature and indicated temperature on
information display in combination meter.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Perform diagnosis for the A/C auto amp. connection recognition signal circuit. Refer to MWI-74,
"DiagnosisProcedure".
6.CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)
1. Check setting value of temperature setting trimmer (front). Refer to HAC-68, "
FRONT AUTOMATIC AIR
CONDITIONING SYSTEM : Temperature Setting Trimmer (Front)".
2. Check that temperature setting trimme r (front) is set to “+ direction”.
Revision: 2010 May2011 QX56

COMPONENT PARTSINL-5
< SYSTEM DESCRIPTION >
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Combination switch
(Lighting & turn signal switch) Refer to
BCS-7, "COMBINATION SWITCH READING SYSTEM : System Description".
 Door lock and unlock switch
 Door request switch
 Door key cylinder switch Inputs the lock/unlock signal to BCM.
 Door switch
 Back door switch Inputs the door switch signal to BCM.
Part Description
Revision: 2010 May2011 QX56

SYSTEMINL-7
< SYSTEM DESCRIPTION >
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Interior Room Lamp Timer Basic Operation
NOTE:
A: Sets the interior room lamp gradual brightening and dimming time.
B: Gradually brightens from 0% to 100% and gradually dims from 100% to 0% in 1 second.
 The interior room lamp turns ON and OFF (gradual brightening and dimming) by the interior room lamp
timer.
 BCM judges the vehicle condition with the following items. It activates the interior room timer.
- Ignition switch status
- Door switch signal (except back door)
- Door lock/unlock signal (remote keyless entry receiv er, each door request switch, door key cylinder switch,
door lock/unlock switch)
NOTE:
Each function of interior room lamp ti mer can be set by CONSULT-III. Refer to INL-14, "
INT LAMP : CON-
SULT-III Function (BCM - INT LAMP)".
Interior Room Lamp ON Operation
 BCM always turns the interior room lamp ON when any door opens excepting back door.
 When all doors are closed, and any all door unlock operation is performed or ignition switch is turned OFF,
BCM brightens interior room lamp to 30% bri ghtness and maintains 30% brightness until any door opens.
 BCM activates the interior room timer in any of the fo llowing conditions to turn the interior room lamp ON for
a period of time.
- Any door opens before all doors close excepting back door.
- Ignition switch is turned ON → OFF.
- Any door unlock signal is detected when all doors cl ose excepting back door with ignition switch OFF.
NOTE:
The timer restarts if new condition is input during the timer operating time.
Interior Room Lamp OFF Operation
BCM stops the timer and turns interior room lamp OF F, when any of the following conditions is satisfied.
 The interior room lamp timer operating time is expired with all doors closed excepting back door.
 Ignition switch position is other than O FF with all doors close excepting back door.
 Any door lock signal is detected with all doors close excepting back door.
LUGGAGE ROOM LAMP CONTROL
BCM controls the luggage room lamp and automatic back door close switch illumination (ground-side) to turn
ON with back door switch ON.
 When luggage room lamp switch is turned to the ON position, luggage room lamp turns ON.
 When luggage room lamp switch is in the DOOR position and back door is opened, luggage room lamp turns ON.
 When back door is opened, automatic back door close switch illumination turn ON.
STEP LAMP CONTROL
BCM controls the step lamp (ground-side) to turn ON with any door switch ON excepting back door.
PUDDLE LAMP TIMER CONTROL
Puddle Lamp Timer Basic Operation
 BCM controls the ground to turn the puddle lamp ON.
JMLIA0961GB
Revision: 2010 May2011 QX56

INL-8
< SYSTEM DESCRIPTION >
SYSTEM
 The puddle lamp turns ON and OFF by the puddle lamp timer.
 BCM judges the vehicle condition with the following items. It activates the puddle lamp timer.
- Ignition switch status
- Door switch signal (except back door)
- Door lock/unlock signal (remote keyless entry receiver, each door request switch)
- Driver side door lock status
Puddle Lamp ON Operation
BCM activates the puddle lamp timer in any of the following conditions to turn the puddle lamp ON for a period
of time.
 Any door opens excepting back door.
 Any door opens before all doors close excepting back door.
 Ignition switch is turned ON → OFF.
 Door unlock signal by remote keyless entry rece iver or each door request switch is detected.
 Driver side door is locked*.
NOTE:
The timer restarts if new condition is input during the timer operating time.
Puddle Lamp OFF Operation
BCM stops the timer and turns puddle lamp OFF, when any of the following conditions are satisfied.
 The puddle lamp timer operating time is expired.
 The interior room lamp OFF conditions.
 The interior room lamp timer operating time is expired.
PUSH-BUTTON IGNITION SWITCH ILLUMINATION CONTROL
Push-button Ignition Switch Illumination Basic Operation
 BCM controls the ON/OFF status of push-button igni tion switch illumination according to vehicle status.
 BCM provides the push-button ignition switch illumi nation control signal and the ground to turn the push-but-
ton ignition switch illumination ON.
 BCM cuts the ground supply while each illumination (tai l lamp) is ON. BCM switches to the ground control
according to the meter illumination control function. Refer to MWI-16, "
METER ILLUMINATION CONTROL :
System Description".
Heart Beat Operation
BCM repeats brightening and dimming operation of push-button ignition switch illumination when any of the
following conditions are satisfied.
 Welcome light function operates.
 When ignition switch is OFF and any of the following conditions are satisfied.
- Driver side door changes from closed to open
- Driver side door changes from locked to unlocked
- Intelligent Key ID comparison is OK and driver side door changes from open to closed
- ID comparison by Intelligent Key transponder is OK
Illumination ON Operation
When ignition switch is not OFF or tail lamp turns ON, push-button ignition switch illumination turns ON.
Dimming Operation
When tail lamp turns OFF and ignition switch is turned OFF, push-button ignition switch illumination dims to
50% brightness.
Illumination OFF Operation
Push-button ignition switch illumination turns OFF when ignition switch turns OFF and tail lamp turns from ON
to OFF, while push-button ignition switch illumination is in ON status.
When push-button ignition switch illumination is at 50% brightness or in heartbeat status, and any of the fol-
lowing conditions are satisfied, push-butt on ignition switch illumination turns OFF.
 15 seconds after start of heartbeat operation.
 When welcome light function is not operating and any on the following conditions is satisfied.
- Driver side door is closed
- Driver side door is locked
- Intelligent Key ID comparison is NG
- Comparison of Intelligent Key ID by transponder is NG
INTERIOR ROOM LAMP BATTERY SAVER SYSTEM
Revision: 2010 May2011 QX56

SYSTEMINL-9
< SYSTEM DESCRIPTION >
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INTERIOR ROOM LAMP BATTERY SAVER SYSTEM : System DiagramINFOID:0000000006216052
INTERIOR ROOM LAMP BATTERY SA VER SYSTEM : System Description
INFOID:0000000006216053
OUTLINE
 Interior room lamp battery saver is controlled by BCM.
 BCM turns applicable lamps OFF depending on the vehicle condition. This function prevents the battery
from over-discharging if the driver neglects turning OFF the any lamps.
Applicable lamps
 Map lamp
 Personal lamp
 Foot lamp
 Luggage room lamp
 Automatic back door close switch illumination
 Step lamp
 Puddle lamp
 Vanity mirror lamp
INTERIOR ROOM LAMP BATTERY SAVER FUNCTION
 When the ignition switch is turned to a position other than ON, BCM operates the timer for a period of time to
cut the interior room lamp power supply.
 BCM restart the timer when any of the following signals changes while operating the timer.
- Push-button ignition switch status
- Door switch signal (ALL)
- Door lock/unlock signal (remote keyless entry re ceiver, each door request switch, door lock and unlock
switch, door key cylinder switch)
 BCM provides the interior room lamp power supply continuously when the ignition switch position is ON.
 When welcome light function operates.
NOTE:
JMLIA1189GB
Revision: 2010 May2011 QX56