air condition INFINITI QX56 2010 Factory Service Manual

HAC-32
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
Air Mix Door Motor (Driver) Diagnosis Procedure
INFOID:0000000005147692
Regarding Wiring Diagram information, refer to HAC-91, "Wiring Diagram".
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (DRIVER)
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Rotate temperature control dial (driver) to 32 °C (90° F).
3. Check voltage between A/C auto amp. harness connector M49
terminal 17 and terminal 18 while rotating temperature control
dial (driver) to 18 °C (60° F).
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK AIR MIX DOOR MOTOR (DRIVE R) CIRCUITS FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M49 terminal 17, 18 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and
Installation".
NO >> Repair or replace harness as necessary.
3.CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Rotate temperature control dial (driver) to 32 °C (90° F).
3. Check voltage between A/C auto amp. harness connector M49 terminal 17 and terminal 18 while rotating temperature control
dial (driver) to 18 °C (60° F).
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
ConnectorTe r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 17 18
Rotate temp
control dial Battery
voltage
AWIIA0112ZZ
17 - Ground : Continuity should not exist.
18 - Ground : Continuity should not exist.
AWIIA0114ZZ
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 18 17 Rotate temp
control dial Battery
voltage
AWIIA0115ZZ
Revision: April 20092010 QX56

AIR MIX DOOR MOTORHAC-33
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4.CHECK AIR MIX DOOR MOTOR (DRIVER) CIRCUITS FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M49 terminal 17 and terminal 18.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.CHECK AIR MIX DOOR MOTOR (DRIVER) CIRCUITS FOR OPEN
1. Disconnect the air mix door motor (driver) harness connector.
2. Check continuity between A/C auto amp. harness connector M49 (A) terminal 17, 18 and the air mix door motor (driver) har-
ness connector M147 (B) terminal 1, 6.
Is the inspection result normal?
YES >> Replace air mix door motor (driver). Refer to VTL-31,
"Removal and Installation".
NO >> Repair or replace harness as necessary.
6.CHECK A/C AUTO AMP. FOR PBR POWER AND GROUND
1. Reconnect A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M50 (A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 7.
7.CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M50 terminal 28 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and
Installation".
NO >> Repair or replace harness as necessary.
8.CHECK PBR REFERENCE VOLT AGE AND GROUND CIRCUITS
Continuity should exist.
AWIIA0116ZZ
17 - 1
: Continuity should exist.
18 - 6 : Continuity should exist.
AWIIA0117ZZ
Connector Te r m i n a l s
Voltage (Ap-
prox.)
(+) (-)
A/C auto amp.: M50, M49 28 35V
AWIIA0118ZZ
Continuity should not exist.
AWIIA0119ZZ
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HAC-34
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M50 (A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 9.
9.CHECK PBR REFERENCE VO LTAGE CIRCUIT FOR OPEN
1. Disconnect the air mix door motor (driver) harness connector.
2. Check continuity between air mix door motor (driver) harness connector M147 (B) terminal 3, 2 and A/C auto amp. harness
connector M49 (C) terminal 3 and M50 (A) terminal 28.
Is the inspection result normal?
YES >> Replace air mix door motor (driver). Refer to VTL-31,
"Removal and Installation".
NO >> Repair or replace harness as necessary.
10.CHECK PBR FEEDBACK VOLTAGE
1. Reconnect the A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49 terminal 6 and ground while rotating temperature control dial
from 32 °C (90 °F) to 18 °C (60° F).
Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 11.
11 .CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M49 terminal 6 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and
Installation".
NO >> Repair or replace harness as necessary.
12.CHECK PBR FEEDBACK CIRCUIT FOR OPEN Continuity should exist.
AWIIA0120ZZ
28 - 3
: Continuity should exist.
3 - 2 : Continuity should exist.
AWIIA0121ZZ
Voltage : Approx. .5V - 4.5V
AWIIA0122ZZ
Continuity should not exist.
AWIIA0123ZZ
Revision: April 20092010 QX56

AIR MIX DOOR MOTORHAC-35
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1. Turn ignition switch OFF.
2. Disconnect the air mix door motor (driver) harness connector and A/C auto amp. harness connector.
3. Check continuity between air mix door motor (driver) harness connector M147 (B) terminal 4 and A/C auto amp. harness con-
nector M49 (A) terminal 6.
Is the inspection result normal?
YES >> Replace air mix door motor (driver). Refer to VTL-31,
"Removal and Installation".
NO >> Repair or replace harness as necessary.
Air Mix Door Motor (Passen ger) Component Function CheckINFOID:0000000005272349
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERAT IONAL CHECK - TEMPERATURE INCREASE
1. Turn the temperature control dial (passenger) clockwise until 32 °C (90 °F) is displayed.
2. Check for hot air at discharge air outlets.
>> GO TO 2.
2.CONFIRM SYMPTOM BY PERFORMING OPERAT IONAL CHECK - TEMPERATURE DECREASE
1. Turn the temperature control dial (passenger) counterclockwise until 18° C (60°F) is displayed.
2. Check for cold air at discharge air outlets.
Is the inspection result normal?
YES >> Inspection End.
NO >> Go to diagnosis procedure. Refer to HAC-35, "
Air Mix Door Motor (Passenger) Diagnosis Proce-
dure".
Air Mix Door Motor (Passe nger) Diagnosis ProcedureINFOID:0000000005147693
Regarding Wiring Diagram information, refer to HAC-91, "Wiring Diagram".
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (PASSENGER)
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Rotate temperature control dial (passenger) to 32 °C (90 °F).
3. Check voltage between A/C auto amp. harness connector M49
terminal 14 and terminal 2 while rotating temperature control dial
(passenger) to 18 ° C (60 °F).
Is the inspection result normal?
OK >> GO TO 3. Continuity should exist.
AWIIA0124ZZ
Connector
Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 2 14 Rotate temp
control dial Battery
voltage
AWIIA0125ZZ
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HAC-36
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
NG >> GO TO 2.
2.CHECK AIR MIX DOOR MOTOR (PASSENG
ER) CIRCUITS FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M49 terminal 14, 2 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and
Installation".
NO >> Repair or replace harness as necessary.
3.CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Rotate temperature control dial (passenger) to 18 °C (60° F).
3. Check voltage between A/C auto amp. harness connector M49 terminal 14 and terminal 2 while rotating temperature control dial
(passenger) to 32 °C (90° F).
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
4.CHECK AIR MIX DOOR MOTOR (PASSENGER) CIRCUITS FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M50 terminal 14 and terminal 2.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.CHECK AIR MIX DOOR MOTOR (P ASSENGER) CIRCUITS FOR OPEN
1. Disconnect the air mix door motor (passenger) harness connec- tor.
2. Check continuity between A/C auto amp. harness connector
M49 (A) terminal 14, 2 and the air mix door motor (passenger)
harness connector M143 (B) terminal 1, 6.
Is the inspection result normal?
YES >> Replace air mix door motor (passenger). Refer to VTL-
31, "Removal and Installation" .
NO >> Repair or replace harness as necessary. 14 - Ground
: Continuity should not exist.
2 - Ground : Continuity should not exist.
AWIIA0126ZZ
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 14 2 Rotate temp
control dial Battery
voltage
AWIIA0127ZZ
Continuity should exist.
AWIIA0128ZZ
14 - 1 : Continuity should exist.
2 - 6 : Continuity should exist.
AWIIA0129ZZ
Revision: April 20092010 QX56

AIR MIX DOOR MOTORHAC-37
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6.CHECK A/C AUTO AMP. FOR PBR POWER AND GROUND
1. Reconnect A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M50 (A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 7.
7.CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M49 terminal 29 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and
Installation".
NO >> Repair or replace harness as necessary.
8.CHECK PBR REFERENCE VOLT AGE AND GROUND CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M50 (A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 9.
9.CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN
1. Disconnect the air mix door mo tor (passenger) harness connec-
tor.
2. Check continuity between air mix door motor (passenger) har- ness connector M143 (B) terminal 3, 2 and A/C auto amp. har-
ness connector M49 (C) terminal 3 and M50 (A) terminal 28.
Is the inspection result normal?
YES >> Replace air mix door motor (passenger). Refer to VTL-
31, "Removal and Installation" .
NO >> Repair or replace harness as necessary.
10.CHECK PBR FEEDBACK VOLTAGE
Connector Te r m i n a l s
Voltage (Ap-
prox.)
(+) (-)
A/C auto amp.: M49 28 35V
AWIIA0099ZZ
Continuity should not exist.
AWIIA0241ZZ
Continuity should exist.
AWIIA0101ZZ
28 - 3 : Continuity should exist.
3 - 2 : Continuity should exist.
AWIIA0121ZZ
Revision: April 20092010 QX56

HAC-38
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
1. Reconnect the A/C auto
amp. harness connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M50 terminal 29 and ground while rotating temperature control dial
(passenger) from 32 °C (90° F) to 18° (60°F).
Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 11.
11 .CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M50 terminal 29 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and
Installation".
NO >> Repair or replace harness as necessary.
12.CHECK PBR FEEDBACK CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the air mix door motor (passenger) harness connec- tor and A/C auto amp. harness connector.
3. Check continuity between air mix door motor (passenger) har- ness connector M143 (B) terminal 4 and A/C auto amp. harness
connector M50 (A) terminal 29.
Is the inspection result normal?
YES >> Replace air mix door motor (passenger). Refer to VTL-
31, "Removal and Installation".
NO >> Repair or replace harness as necessary. Voltage
: Approx. .5V - 4.5V
AWIIA0131ZZ
Continuity should not exist.
AWIIA0132ZZ
Continuity should exist.
AWIIA0133ZZ
Revision: April 20092010 QX56

INTAKE DOOR MOTORHAC-39
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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INTAKE DOOR MOTOR
System DescriptionINFOID:0000000005147694
SYSTEM DESCRIPTION
SYMTOM:• Intake door motor does not operate normally.
• Intake door does not change.
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:• A/C auto amp.
• A/C and AV switch assembly
• Intake door motor (PRB built into the intake door motor)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.
In the AUTO mode, the A/C auto amp. determines the intake door position based on the ambient temperature,
the intake air temperature and the in-vehicle temperatur e. When the DEF, D/F, FLOOR or OFF switches are
pushed, the A/C auto amp. sets the intake door at the fresh position.
Intake Door Control Specification
AWIIA0144GB
AWIIA0145GB
Revision: April 20092010 QX56

HAC-40
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
COMPONENT DESCRIPTION
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the A/C auto amp. Motor rotation is
conveyed to a lever which activates the intake door.
Intake Door Motor Component Function CheckINFOID:0000000005147695
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING
OPERATIONAL CHECK - REC ( )
1. Press the mode switch to vent mode( ).
2. Press REC ( ) switch. The REC ( ) indicator should illuminate.
3. Press REC ( ) switch again. The REC ( ) indicator should go out.
4. Listen for intake door position change (you should hear blower sound change slightly).
Is the inspection result normal?
YES >> Inspection End.
NO >> Go to diagnosis procedure. Refer to HAC-40, "
Intake Door Motor Diagnosis Procedure".
Intake Door Motor Diagnosis ProcedureINFOID:0000000005147696
Regarding Wiring Diagram information, refer to HAC-91, "Wiring Diagram".
SYMPTOM:
• Intake door does not change.
• Intake door motor does not operate normally.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Check voltage between A/C auto amp. harness connector M49 terminal 21 and terminal 22 while placing the HVAC system into
self-diagnostic mode.
Is the inspection result normal?
OK >> GO TO 3.
NO >> GO TO 2.
2.CHECK INTAKE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
WJIA0552E
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 21
22Self-diagnostic
mode Battery volt-
age
AWIIA0146ZZ
Revision: April 20092010 QX56

INTAKE DOOR MOTORHAC-41
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M49 terminal 21, 22 and ground.
Is the inspection result normal?
OK >> Replace A/C auto amp. Refer to VTL-7, "Removal and
Installation".
NO >> Repair or replace harness as necessary.
3.CHECK A/C AUTO AMP. FOR GROUND AND POWER
1. Press the BACK button to back out of self-diagnostic mode.
2. Check voltage between A/C auto amp. harness connector M49 terminal 21 and terminal 22 while placing the HVAC system into
self-diagnostic mode.
Is the inspection result normal?
OK >> GO TO 4.
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
4.CHECK INTAKE DOOR MOTOR AND CIRCUITS FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M49 terminal 21 and terminal 22.
Is the inspection result normal?
OK >> Replace intake door motor. Refer to VTL-27, "Removal
and Installation".
NO >> GO TO 5.
5.CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN
1. Disconnect the intake door motor harness connector.
2. Check continuity between A/C auto amp. harness connector M49 (A) terminal 21, 22 and the intake door motor harness con-
nector M58 (B) terminal 1, 6.
Is the inspection result normal?
YES >> Replace intake door motor. Refer to VTL-27, "Removal
and Installation".
NO >> Repair or replace harness as necessary. 21 - Ground
: Continuity should not exist.
22 - Ground : Continuity should not exist.
AWIIA0147ZZ
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 22 21 Self-diagnostic
mode Battery
voltage
AWIIA0148ZZ
Continuity should exist.
AWIIA0149ZZ
21 - 6 : Continuity should exist.
22 - 1 : Continuity should exist.
AWIIA0234ZZ
Revision: April 20092010 QX56