2011 INFINITI QX56 air conditioning

HAC-110
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
A/C AUTO AMP.
A/C AUTO AMP. : Diagnosis ProcedureINFOID:0000000006275948
1.CHECK FUSE
Check 10A fuse [No. 9, 19, and 4, located 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 A/C AUTO AMP. POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check voltage between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector between A/C auto amp. and fuse block (J/B).
3.CHECK A/C AUTO AMP. GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair harness or connector.
FRONT AIR MIX DOOR MOTOR (DRIVER SIDE)
FRONT AIR MIX DOOR MOTOR (DRI VER SIDE) : Diagnosis ProcedureINFOID:0000000006275949
1.CHECK FRONT AIR MIX DOOR MOTO R (DRIVER SIDE) POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between front air mix door motor LH harness connector and ground.
+
− Vo l ta g e
A/C auto amp. Ignition switch position
Connector Terminal OFF ACC ON
M50 4
Ground Approx. 0 V Battery voltage Battery voltage
23 Approx. 0 V Approx. 0 V Battery voltage 3 Battery voltage Battery voltage Battery voltage
A/C auto amp. —Continuity
Connector Terminal
M50 2
Ground Existed
22
37
Revision: 2010 May2011 QX56

POWER SUPPLY AND GROUND CIRCUITHAC-111
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK FRONT AIR MIX DOOR MOTOR (DRIVER SIDE) GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front air mix door motor LH connector.
3. Check continuity between front air mix door motor LH harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK INSTALLATION OF FRONT AI R MIX DOOR MOTOR (DRIVER SIDE)
Check front air mix door motor (driver side) is properly installed. Refer to HAC-152, "
Exploded View".
Is the inspection result normal?
YES >> Replace front air mix door motor (driver 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 (DRIVER SIDE) POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front air mix door motor LH connector and A/C auto amp. connector.
3. Check continuity between front air mix door moto r LH 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.
FRONT AIR MIX DOOR MO TOR (PASSENGER SIDE)
FRONT AIR MIX DOOR MOTOR (PASSEN GER SIDE) : Diagnosis Procedure
INFOID:0000000006275950
1.CHECK FRONT AIR MIX DOOR MOTOR (PASSENGER SIDE) POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between front air mix door motor RH harness connector and ground.
+
−Vol tag e
(Approx.)
Front air mix door motor LH
Connector Terminal M252 1 Ground 12 V
Front air mix door motor LH —Continuity
Connector Terminal
M252 2 Ground Existed
Front air mix door motor LH A/C auto amp. Continuity
Connector Terminal Connector Terminal
M252 1 M50 17 Existed
+ −Vol tag e
(Approx.)
Front air mix door motor RH
Connector Terminal M255 1 Ground 12 V
Revision: 2010 May2011 QX56

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]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
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]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
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
D
E
F
G H
J
K L
M A
B
HAC
N
O P
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