air condition INFINITI QX56 2011 Factory Service Manual

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

FRONT BLOWER MOTORHAC-123
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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NO >> Replace front blower motor. Refer to VTL-16, "FRONT A/C UNIT : Removal and Installation".
Component Inspection (Blower Relay)INFOID:0000000006275970
1.CHECK BLOWER RELAY
1. Turn ignition switch OFF.
2. Remove blower relay.
3. Check continuity between blower relay terminal 3 and 5 when voltage is supplied between terminal 1 and 2.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace blower relay.
Terminal Voltage Continuity
35 ON Existed
OFF Not existed
JSIIA1551ZZ
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

IONIZER
HAC-125
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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G H
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M A
B
HAC
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Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> GO TO 5.
5.CHECK IONIZER (ON/OFF) CONT ROL SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect ionizer connector.
3. Check continuity between A/C auto amp. harness connector and ionizer harness connector.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK IONIZER (ON/OFF) CONT ROL SIGNAL CIRCUIT FOR SHORT
Check continuity between A/C aut o amp. harness connector and ground.
Is the inspection result normal?
YES >> Replace ionizer. Refer to HAC-155, "Removal and Installation".
NO >> Repair harness or connector.
+
−Vo l ta g e
A/C auto amp.
Connector Terminal M50 5 Ground Battery voltage
A/C auto amp. Ionizer Continuity
Connector Terminal Connector Terminal
M50 5 M130 4 Existed
A/C auto amp. —Continuity
Connector Terminal
M50 5 Ground Not existed
Revision: 2010 May2011 QX56

HAC-126
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
MAGNET CLUTCH
MAGNET CLUTCH
Component Function CheckINFOID:0000000006275973
1.CHECK MAGNET CLUTCH OPERATION
Perform auto active test of IPDM E/R. Refer to PCS-10, "
Diagnosis Description".
Does it operate normally?
YES >> INSPECTION END
NO >> Refer to HAC-126, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006275974
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 10A fuse (No. 49, located in IPDM E/R). 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 MAGNET CLUTCH POWER SUPPLY CIRCUIT
1. Disconnect compressor connector and IPDM E/R connector.
2. Check continuity between compressor harness connector and IPDM E/R harness connector.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK MAGNET CLUTCH
Directly apply battery voltage to the magnet clutch. Check operation visually and by sound.
Does it operate normally?
YES >> Replace IPDM E/R. Refer to PCS-32, "Removal and Installation".
NO >> Replace magnet clutch. Refer to HA-31, "
MAGNET CLUTCH : Removal and Installation of Com-
pressor Clutch".
Compressor IPDM E/R
Continuity
Connector Terminal Connector Terminal
F43 1 E15 56 Existed
Revision: 2010 May2011 QX56

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

HAC-128
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
REAR A/C SOLENOID VALVE
REAR A/C SOLENOID VALVE
Diagnosis ProcedureINFOID:0000000006275976
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 REAR A/C SOLENOID VALVE POWER SUPPLY
1. Disconnect rear A/C solenoid valve connector.
2. Turn ignition switch ON and front air conditioning system ON.
3. Check voltage between rear A/C solenoid valve harness connector and ground when rear blower motor is operated.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 4.
3.CHECK REAR A/C SOLENOID VALVE GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear A/C solenoid valve harness connector and ground.
Is the inspection result normal?
YES >> Replace rear expansion valve assembly. Refer to HA-49, "EXPANSION VALVE : Removal and
Installation".
NO >> Repair harness or connector.
4.CHECK REAR A/C RELAY POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect rear A/C relay connector.
3. Turn ignition switch ON.
4. Check voltage between rear A/C relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
+
−Condition Vo l ta g e
(Approx.)
Rear A/C solenoid valve
Connector Terminal
B207 1 Ground Rear blower motor ON Battery voltage
OFF 0 V
Rear A/C sole noid valve
—Continuity
Connector Terminal
B207 2 Ground Existed
+ −Vol tag e
(Approx.)
Rear A/C relay
Connector Terminal
E87 1
Ground Battery voltage
3
Revision: 2010 May2011 QX56

REAR A/C SOLENOID VALVEHAC-129
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
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NO >> Repair harness or connector between rear A/C relay and fuse block (J/B).
5.CHECK REAR A/C RERAY CONTROL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between rear A/C relay har ness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK REAR A/C RELAY CONTROL CIRCUIT FOR SHORT
Check continuity between rear A/C relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair harness or connector.
7.CHECK REAR A/C SOLENOID VALVE POWER SUPPLY CIRCUIT
Check continuity between rear A/C relay harness c onnector and rear A/C solenoid valve harness connector.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair harness or connector.
8.CHECK REAR A/C RELAY
Check rear A/C relay. Refer to HAC-129, "
Component Inspection".
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Replace rear A/C relay.
Component InspectionINFOID:0000000006275977
1.CHECK REAR A/C RELAY
1. Remove rear A/C relay.
Rear A/C relay A/C auto amp. Continuity
Connector Terminal Connector Terminal
E87 2 M50 38 Existed
Rear A/C relay —Continuity
Connector Terminal
E87 2 Ground Not existed
Rear A/C relay Rear A/C solenoid valve Continuity
Connector Terminal Connector Terminal
E87 5 B207 1 Existed
Revision: 2010 May2011 QX56