2008 INFINITI QX56 Ignition switch removal

HAC-36
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
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.
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
ConnectorTe r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 2 14 Rotate temp
control dial Battery
voltage
AWIIA0125ZZ
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
Revision: March 2010 2008 QX56

AIR MIX DOOR MOTORHAC-37
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
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 (PASSENGER) CIRCUITS FOR OPEN
1. Disconnect the air mix door mo tor (passenger) harness connec-
tor.
2. Check continuity between A/C auto amp. harness connector
M49 terminal (A) 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-
26, "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 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
Continuity should exist.
AWIIA0128ZZ
14 - 1
: Continuity should exist.
2 - 6 : Continuity should exist.
AWIIA0129ZZ
Connector Te r m i n a l s
Voltage (Ap-
prox.)
(+) (-)
A/C auto amp.: M49 28 3 5V
AWIIA0099ZZ
Continuity should not exist.
AWIIA0241ZZ
Revision: March 2010 2008 QX56

HAC-38
< 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 (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 terminal 28.
Is the inspection result normal?
YES >> Replace air mix door motor (passenger). Refer to VTL-
26, "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 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 Continuity should exist.
AWIIA0101ZZ
28 - 3
: Continuity should exist.
3 - 2 : Continuity should exist.
AWIIA0121ZZ
Voltage : Approx. .5V - 4.5V
AWIIA0131ZZ
Continuity should not exist.
AWIIA0132ZZ
Revision: March 2010 2008 QX56

AIR MIX DOOR MOTORHAC-39
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
1. Turn ignition switch OFF.
2. Disconnect the air mix door mo tor (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-
26, "Removal and Installation".
NO >> Repair or replace harness as necessary. Continuity should exist.AWIIA0133ZZ
Revision: March 2010
2008 QX56

HAC-42
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
Intake Door Motor Diagnosis Procedure
INFOID:0000000001679791
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
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
ConnectorTe r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 21
22Self-diagnostic
mode Battery volt-
age
AWIIA0146ZZ
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
Revision: March 2010 2008 QX56

INTAKE DOOR MOTORHAC-43
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
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-22, "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-22, "Removal
and Installation" .
NO >> Repair or replace harness as necessary. Continuity should exist.
AWIIA0149ZZ
21 - 6
: Continuity should exist.
22 - 1 : Continuity should exist.
AWIIA0234ZZ
Revision: March 2010 2008 QX56

DEFROSTER DOOR MOTOR CIRCUITHAC-45
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
Defroster Door Motor Co mponent Function CheckINFOID:0000000001679793
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING O PERATIONAL CHECK - DEFROSTER DOOR
1. Press the mode switch and select vent ( ).
2. Press the defrost switch ( ). Defroster indicator should illuminate (on display).
3. Listen for defroster door position change (blower sound should change slightly).
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to HAC-4, "
Operational Check (Front)".
Does another symptom exist?
YES >> Refer to HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> SYSTEM OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK DEFROSTER DOOR MOTOR
Perform diagnostic procedure for defroster door motor. Refer to HAC-45, "
Defroster Door Motor Component
Function Check".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair PBR circuit or replace defroster door motor. Refer to VTL-21, "
Removal and Installation".
5.CHECK DEFROSTER DOOR OPERATION
Check and verify defroster door mechanism for smooth operation.
Is the inspection result normal?
YES >> Replace defroster door motor. Refer to VTL-21, "Removal and Installation".
NO >> Repair defroster door mechanism.
Defroster Door Motor Diagnosis ProcedureINFOID:0000000001679794
SYMPTOM:
• Defroster door does not change.
• Defroster door motor does not operate normally.
DIAGNOSTIC PROCEDURE FOR DEFROSTER DOOR MOTOR
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Press the defroster switch ( ).
3. Check voltage between A/C auto amp. harness connector M49 terminal 24 and terminal 23 and press the defroster switch ( )
again.
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 24 23 Press de-
froster switch Battery
voltage
AWIIA0152ZZ
Revision: March 2010 2008 QX56

HAC-46
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
DEFROSTER DOOR MOTOR CIRCUIT
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK DEFROSTER DOOR MOTOR 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 23, 24 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 GROUND AND POWER
1. Press the defroster switch ( ).
2. Check voltage between A/C auto amp. harness connector M49 terminal 23 and terminal 24 and pr ess the defroster switch ( )
again.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
4.CHECK DEFROSTER 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 23 and terminal 24.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.CHECK DEFROSTER DOOR MOTOR CIRCUITS FOR OPEN
1. Disconnect the defroster door motor harness connector.
2. Check continuity between A/C auto amp. harness connector M49 (A) terminal 23, 24 and the defroster door motor harness
connector M144 (B) terminal 1, 6.
Is the inspection result normal?
YES >> Replace defroster door motor. Refer to VTL-21,
"Removal and Installation".
23 - Ground : Continuity should not exist.
24 - Ground : Continuity should not exist.
AWIIA0153ZZ
Connector
Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 23 24 Press de-
froster
switch Battery
voltage
AWIIA0154ZZ
Continuity should exist.
AWIIA0155ZZ
23 - 1 : Continuity should exist.
24 - 6 : Continuity should exist.
AWIIA0156ZZ
Revision: March 2010 2008 QX56