2011 INFINITI QX56 ground

POWER SUPPLY AND GROUND CIRCUITHAC-115
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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M A
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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]
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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

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 BLOWER MOTORHAC-121
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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FRONT BLOWER MOTOR
Diagnosis ProcedureINFOID:0000000006275968
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 15A fuse [No. 21 and 22, 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 FRONT BLOWER MOTOR POWER SUPPLY
1. Disconnect front blower motor connector.
2. Turn ignition switch ON.
3. Check voltage between front blower motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 6.
3.CHECK FRONT BLOWER MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between front blower motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK FRONT BLOWER MOTOR CONTROL SIGNAL CIRCUIT
1. Disconnect A/C auto amp. connector.
2. Check continuity between front blower motor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair the harness or connector.
5.CHECK FRONT BLOWER MOTOR CONTROL SIGNAL
1. Reconnect front blower motor connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Operate MODE switch to set air outlet to VENT.
4. Change fan speed from Lo to Hi, and check duty rati os between front blower motor harness connector
and ground by using an oscilloscope.
+
−Vol tag e
Front blower motor
Connector Terminal M272 1 Ground Battery voltage
Front blower motor —Continuity
Connector Terminal
M272 3 Ground Existed
Front blower motor A/C auto amp. Continuity
Connector Terminal Connector Terminal
M272 2 M50 14 Existed
Revision: 2010 May2011 QX56

HAC-122
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
FRONT BLOWER MOTOR
NOTE:
Calculate drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms
Is the inspection result normal?
YES >> Replace front blower motor. Refer to VTL-16, "FRONT A/C UNIT : Removal and Installation".
NO >> Replace A/C auto amp.. Refer to HAC-146, "
Removal and Installation".
6.CHECK BLOWER RELAY GROUND CIRCUIT
Check continuity between fuse bl ock (J/B) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair harness or connector.
7.CHECK BLOWER RELAY
Check blower relay. Refer to HAC-123, "
Component Inspection (Blower Relay)".
Is the inspection result normal?
YES >> Repair harness or connector between front blower motor and fuse block (J/B).
NO >> Replace blower relay.
Component Inspection (Front Blower Motor)INFOID:0000000006275969
1.CHECK FRONT BLOWER MOTOR-I
1. Remove front blower motor.
2. Check that there is not any mixing foreign object in the front blower motor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace front blower motor. Refer to VTL-16, "
FRONT A/C UNIT : Removal and Installation".
2.CHECK FRONT BLOWER MOTOR-II
Check that there is not breakage or damage in the front blower motor.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Replace front blower motor. Refer to VTL-16, "
FRONT A/C UNIT : Removal and Installation".
3.CHECK FRONT BLOWER MOTOR-III
Check that front blower motor turns smoothly.
Is the inspection result normal?
YES >> INSPECTION END
Front 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
Fuse block (J/B) —Continuity
Connector Terminal
M3 7C Ground Existed
Revision: 2010 May2011 QX56

HAC-124
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
IONIZER
IONIZER
Component Function CheckINFOID:0000000006275971
1.CHECK IONIZER OPERATION SOUND
1. Turn ignition switch ON.
2. Check ionizer operation sound (whirri ng sound) in duct by putting an ear to the side ventilator grille (driver
side) outlet while pressing fan switch and OFF switch alternately.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Refer to HAC-124, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006275972
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 10A fuse [No.4, 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 IONIZER POWER SUPPLY
1. Disconnect ionizer connector.
2. Turn ignition switch ON.
3. Check voltage between ionizer harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector between ionizer and fuse block (J/B).
3.CHECK IONIZER GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between ionizer harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK IONIZER (ON/OFF) CONTROL SIGNAL CIRCUIT
1. Connect ionizer connector.
2. Disconnect A/C auto amp. connector.
3. Turn ignition switch ON.
4. Check voltage between A/C auto amp. harness connector and ground.
+
−Voltag e
Ionizer
Connector Terminal M130 1 Ground Battery voltage
Ionizer —Continuity
Connector Terminal
M130 3 Ground Existed
Revision: 2010 May2011 QX56