door INFINITI QX56 2011 Factory Service Manual

HAC-112
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK FRONT AIR MIX DOOR MOTO
R (PASSENGER SIDE) GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front air mix door motor RH connector.
3. Check continuity between front air mi x door motor RH harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK INSTALLATION OF FRONT AIR MIX DOOR MOTOR (PASSENGER SIDE)
Check front air mix door motor (passenger side) is properly installed. Refer to HAC-152, "
Exploded View".
Is the inspection result normal?
YES >> Replace front air mix door motor (passenger side). Refer to HAC-153, "AIR MIX DOOR MOTOR :
Removal and Installation".
NO >> Repair or replace malfunctioning part.
4.CHECK FRONT AIR MIX DOOR MOTOR (P ASSENGER SIDE) POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front air mix door motor RH connector and A/C auto amp. connector.
3. Check continuity between front air mix door motor RH harness connector and A/C auto am\
p. harness con- nector.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
FRONT MODE DOOR MOTOR
FRONT MODE DOOR MOTOR : Diagnosis ProcedureINFOID:0000000006275951
1.CHECK FRONT MODE DOOR MOTOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between front mode door motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK FRONT MODE DOOR MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front mode door motor connector.
Front air mix door motor RH —Continuity
Connector Terminal
M255 2 Ground Existed
Front air mix door motor RH A/C auto amp. Continuity
Connector Terminal Connector Terminal
M255 1 M50 17 Existed
+ −Voltage
(Approx.)
Front mode door motor
Connector Terminal M253 1 Ground 12 V
Revision: 2010 May2011 QX56

POWER SUPPLY AND GROUND CIRCUITHAC-113
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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3. Check continuity between front mode door motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK INSTALLATION OF FRONT MO DE DOOR MOTOR CONTROL LINKAGE
Check front mode door motor control linkage is properly installed. Refer to HAC-152, "
Exploded View".
Is the inspection result normal?
YES >> Replace front mode door motor. Refer to HAC-153, "MODE DOOR MOTOR : Removal and Instal-
lation".
NO >> Repair or replace malfunctioning part.
4.CHECK FRONT MODE DOOR MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front mode door motor connector and A/C auto amp. connector.
3. Check continuity between front mode door moto r harness connector and A/C auto amp. harness connec-
tor.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
INTAKE DOOR MOTOR
INTAKE DOOR MOTOR : Diagnosis ProcedureINFOID:0000000006275952
1.CHECK INTAKE MODE DOOR MOTOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between intake mode door motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK INTAKE MODE DOOR MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect intake mode door motor connector.
3. Check continuity between intake mode door motor harness connector and ground.
Front mode door motor —Continuity
Connector Terminal
M253 2 Ground Existed
Front mode door motor A/C auto amp. Continuity
Connector Terminal Connector Terminal
M253 1 M50 17 Existed
+ −Vol tag e
(Approx.)
Intake mode door motor
Connector Terminal M254 1 Ground 12 V
Intake mode door motor —Continuity
Connector Terminal
M254 2 Ground Existed
Revision: 2010 May2011 QX56

HAC-114
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK INSTALLATION OF INTAKE MO
DE DOOR MOTOR CONTROL LINKAGE
Check intake mode door motor control linkage is properly installed. Refer to HAC-152, "
Exploded View".
Is the inspection result normal?
YES >> Replace intake mode door motor. Refer to HAC-153, "INTAKE DOOR MOTOR : Removal and
Installation".
NO >> Repair or replace malfunctioning part.
4.CHECK INTAKE MODE DOOR MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect intake mode door motor connector and A/C auto amp. connector.
3. Check continuity between intake mode door mo tor harness connector and A/C auto amp. harness con-
nector.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
REAR AIR MIX DOOR MOTOR
REAR AIR MIX DOOR MOTO R : Diagnosis ProcedureINFOID:0000000006275953
1.CHECK REAR AIR MIX DOOR MOTOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between rear air mix door motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK REAR AIR MIX DOOR MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear air mix door motor connector.
3. Check continuity between rear air mix door motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK INSTALLATION OF REAR AIR MIX DOOR MOTOR
Check rear air mix door motor is properly installed. Refer to HAC-152, "
Exploded View".
Intake mode door motor A/C auto amp.
Continuity
Connector Terminal Connector Terminal
M254 1 M50 17 Existed
+ −Voltage
(Approx.)
Rear air mix door motor
Connector Terminal B210 1 Ground 12 V
Rear air mix door motor —Continuity
Connector Terminal
B210 2 Ground Existed
Revision: 2010 May2011 QX56

POWER SUPPLY AND GROUND CIRCUITHAC-115
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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Is the inspection result normal?
YES >> Replace rear air mix door motor. Refer to HAC-154, "REAR AIR MIX DOOR MOTOR : Removal
and Installation".
NO >> Repair or replace malfunctioning part.
4.CHECK REAR AIR MIX DOOR MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear air mix door motor connector and A/C auto amp. connector.
3. Check continuity between rear air mix door mo tor harness connector and A/C auto amp. harness connec-
tor.
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
REAR A/C CONTROL : Diagnosis ProcedureINFOID:0000000006275954
1.CHECK FUSE
Check 10A fuse [No. 4, locat ed in the 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 A/C CONTROL POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect rear A/C control connector.
3. Turn ignition switch ON.
4. Check voltage between rear A/C control harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector between r ear A/C control and fuse block (J/B).
3.CHECK REAR A/C CONTROL GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear A/ C control harness connector and ground.
Is the inspection result normal?
YES >> Replace rear A/C control. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
Rear air mix door motor A/C auto amp. Continuity
Connector Terminal Connector Terminal
B210 1 M50 17 Existed
+ −Voltage
Rear A/C control
Connector Terminal M41 12 Ground Battery voltage
Rear A/C control —Continuity
Connector Terminal
M41 1 Ground Existed
Revision: 2010 May2011 QX56

HAC-116
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
POWER SUPPLY AND GROUND CIRCUIT
REAR MODE DOOR MOTOR
REAR MODE DOOR MOTOR : Diagnosis ProcedureINFOID:0000000006275955
1.CHECK REAR MODE DOOR MOTOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between rear mode door motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK REAR MODE DOOR MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear mode door motor connector.
3. Check continuity between rear mode door motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK INSTALLATION OF REAR MO DE DOOR MOTOR CONTROL LINKAGE
Check rear mode door motor control linkage is properly installed. Refer to HAC-152, "
Exploded View".
Is the inspection result normal?
YES >> Replace rear mode door motor. Refer to HAC-154, "REAR MODE DOOR MOTOR : Removal and
Installation".
NO >> Repair or replace malfunctioning part.
4.CHECK REAR MODE DOOR MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear mode door motor connector and A/C auto amp. connector.
3. Check continuity between rear mode door moto r harness connector and A/C auto amp. harness connec-
tor.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
UPPER VENTILATOR DOOR MOTOR
UPPER VENTILATOR DOOR MOTOR : Diagnosis ProcedureINFOID:0000000006275956
1.CHECK UPPER VENTILATOR DOOR MOTOR POWER SUPPLY
1. Turn ignition switch ON.
+
−Voltage
(Approx.)
Rear mode door motor
Connector Terminal B209 1 Ground 12 V
Rear mode door motor —Continuity
Connector Terminal
B209 2 Ground Existed
Rear mode door motor A/C auto amp. Continuity
Connector Terminal Connector Terminal
B209 1 M50 17 Existed
Revision: 2010 May2011 QX56

POWER SUPPLY AND GROUND CIRCUITHAC-117
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
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G H
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M A
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HAC
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2. Check voltage between upper ventilator door motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK UPPER VENTILATOR DOOR MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect upper ventilator door motor connector.
3. Check continuity between upper ventilator door motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK INSTALLATION OF UPPER VENTILATOR DOOR MOTOR
Check upper ventilator door motor is properly installed. Refer to HAC-152, "
Exploded View".
Is the inspection result normal?
YES >> Replace upper ventilator door motor. Refer to HAC-154, "UPPER VENTILATOR DOOR MOTOR :
Removal and Installation".
NO >> Repair or replace malfunctioning part.
4.CHECK UPPER VENTILATOR DOOR MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect upper ventilator door moto r connector and A/C auto amp. connector.
3. Check continuity between upper ventilator door mo tor harness connector and A/C auto amp. harness con-
nector.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
+
−Vol tag e
(Approx.)
Upper ventilator door motor
Connector Terminal M256 1 Ground 12 V
Upper ventilator door motor —Continuity
Connector Terminal
M256 2 Ground Existed
Upper ventilator door motor A/C auto amp. Continuity
Connector Terminal Connector Terminal
M256 1 M50 17 Existed
Revision: 2010 May2011 QX56

HAC-118
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
DOOR MOTOR
DOOR MOTOR
Diagnosis ProcedureINFOID:0000000006275966
1.CHECK EACH DOOR MOTOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between intake door motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK EACH DOOR MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect intake door motor connector.
3. Check continuity between intake door motor harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair harness or connector.
3.CHECK EACH DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN
1. Disconnect A/C auto amp. connector.
2. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK EACH DOOR MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Disconnect following connectors.
- Front air mix door motor LH
- Front air mix door motor RH
- Front mode door motor
- Upper vent door motor
- Rear air mix door motor
- Rear mode door motor
2. Check continuity between intake door motor harness connector and ground.
Is the inspection result normal?
+
−Vo l ta g e
(Approx.)
Intake door motor
Connector Terminal M254 1 Ground 12 V
Intake door motor —Continuity
Connector Terminal
M254 2 Ground Existed
Intake door motor A/C auto amp. Continuity
Connector Terminal Connector Terminal
M254 1 M50 17 Existed
Intake door motor —Continuity
Connector Terminal
M254 1 Ground Not existed
Revision: 2010 May2011 QX56

DOOR MOTORHAC-119
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
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G H
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M A
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YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
Revision: 2010 May2011 QX56

HAC-120
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
DOOR MOTOR COMMUNICATION CIRCUIT
DOOR MOTOR COMMUNICATION CIRCUIT
Diagnosis ProcedureINFOID:0000000006275967
NOTE:
If all of door motor DTCs are detected, check this circuit.
1.CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check output waveform between A/C auto amp. harness connector and ground with the oscilloscope.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK EACH DOOR MOTOR COMMUNICA TION SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connecto r and intake door motor connector.
3. Check continuity between A/C auto amp. harness connector and intake door motor harness connector.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair harness or connector.
3.CHECK EACH DOOR MOTOR COMMUNICA TION SIGNAL CIRCUIT FOR SHORT
1. Disconnect following connectors.
- Front air mix door motor LH
- Front air mix door motor RH
- Front mode door motor
- Upper vent door motor
- Rear air mix door motor
- Rear mode door motor
2. Check continuity between A/C auto amp. 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.
+
−Output waveform
A/C auto amp.
Connector Terminal
M50 16 Ground
SJIA1453J
A/C auto amp. Intake door motor Continuity
Connector Terminal Connector Terminal
M50 16 M254 3 Existed
A/C auto amp. —Continuity
Connector Terminal
M50 16 Ground Not existed
Revision: 2010 May2011 QX56

FRONT AUTOMATIC AIR CONDITIONING SYSTEMHAC-133
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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SYMPTOM DIAGNOSIS
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
Diagnosis Chart By SymptomINFOID:0000000006275980
NOTE:
Perform the self-diagnoses with CONSULT-III before per forming the symptom diagnosis. If DTC is detected,
perform the corresponding diagnosis.
Symptom Corresponding malfunction part Reference
 Front air conditioning system does not activate.
 Front air conditioning system cannot be con-
trolled.
 Operation status of front air conditioning system is
not indicated on front dis-
play. Fail-safe activates Multi AV system
AV- 1 9 9 , "
Symptom Table"
Fail-safe does not acti-
vate Power supply system of A/C auto
amp.
 A/C auto amp. HAC-110, "A/C AUTO AMP. : Diag-
nosis Procedure"
 Air outlet does not change (Except upper ventila-
tion).
 Front mode door motor does not operate normally.  Circuit between front mode door
motor and A/C auto amp.
 Front mode door motor control link-
age
 Front mode door motor
 A/C auto amp. HAC-112, "FRONT MODE DOOR
MOTOR : Diagnosis Procedure"
 Upper ventilator door does not change.
 Upper ventilator door motor does not operate nor-
mally.  Circuit between upper ventilator
door motor and A/C auto amp.
 Upper ventilator door motor installa- tion condition
 Upper ventilator door motor
 A/C auto amp. HAC-116, "UPPER VENTILATOR
DOOR MOTOR : Diagnosis Proce-
dure"
 Discharge air temperature of driver side does not
change.
 Front air mix door motor (driver side) does not op-
erate normally.  Circuit between front air mix door
motor (driver side ) and A/C auto
amp.
 Front air mix door motor (driver side)
installation condition
 Front air mix door motor (driver side)
 A/C auto amp. HAC-110, "FRONT AIR MIX DOOR
MOTOR (DRIVER SIDE) : Diagno-
sis Procedure"
 Discharge air temperature of passenger side does
not change.
 Front air mix door motor (passenger side) does not
operate normally.  Circuit between front air mix door
motor (passenger side) and A/C
auto amp.
 Front air mix door motor (passenger side) installation condition
 Front air mix door motor (passenger side)
 A/C auto amp. HAC-111, "FRONT AIR MIX DOOR
MOTOR (PASSENGER SIDE) : Di-
agnosis Procedure"
 Intake door does not change.
 Intake door motor does not operate normally.
 Circuit between intake door motor
and A/C auto amp.
 Intake door motor control linkage
 Intake door motor
 A/C auto amp. HAC-113, "INTAKE DOOR MOTOR
: Diagnosis Procedure"
All door motors do not operate normally.
 Each door motor power supply and
ground circuit
 A/C auto amp. HAC-118, "Diagnosis Procedure"
Front blower motor operation is malfunctioning.  Power supply system of front blower
motor
 Circuit between front blower motor and A/C auto amp..
 Front blower motor
 A/C auto amp. HAC-121, "Diagnosis Procedure"
Revision: 2010 May2011 QX56