2010 INFINITI QX56 Ignition switch

HAC-76
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AMBIENT SENSOR
1. Disconnect ambient sensor connector.
2. Turn ignition switch ON.
3. Check voltage between ambient sensor harness connector E1
terminal 1 and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK CIRCUIT CONTINUITY BETWEEN AM BIENT SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between am bient sensor harness connector
E1 (B) terminal 2 and A/C auto amp. harness connector M49 (A)
terminal 26.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK AMBIENT SENSOR
Check the ambient sensor circuit. Refer to HAC-76, "
Ambient Sensor Component Inspection".
Is the inspection result normal?
YES >> 1. Replace A/C auto amp. Refer to VTL-7, "Removal and Installation".
2. GO TO HAC-23, "
A/C Auto Amp. Self-Diagnosis" and perform self-diagnosis.
NO >> 1. Replace ambient sensor. 2. GO TO HAC-23, "
A/C Auto Amp. Self-Diagnosis" and perform self-diagnosis.
4.CHECK CIRCUIT CONTINUITY BETWEEN AM BIENT SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between am bient sensor harness connector
E1 (B) terminal 1 and A/C auto amp. harness connector M49 (A)
terminal 25.
4. Check continuity between am bient sensor harness connector
E1 (B) terminal 1 and ground.
Is the inspection result normal?
YES >> 1. Replace A/C auto amp. Refer to VTL-7, "Removal and Installation".
2. GO TO HAC-23, "
A/C Auto Amp. Self-Diagnosis" and perform self-diagnosis.
NO >> Repair harness or connector.
Ambient Sensor Component InspectionINFOID:0000000005147720
COMPONENT INSPECTION
Ambient Sensor
1 - Ground : Approx. 5V
AWIIA0161ZZ
2 - 26: Continuity should exist.
AWIIA1039ZZ
1 - 25: Continuity should exist.
1 - Ground : Continuity should not exist.
AWIIA1040ZZ
Revision: April 20092010 QX56

IN-VEHICLE SENSORHAC-79
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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1. Disconnect in-vehicle sensor connector.
2. Turn ignition switch ON.
3. Check voltage between in-vehicle sensor harness connector M32 terminal 4 and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 5.
3.CHECK CIRCUIT CONTINUITY BETWEEN IN-V EHICLE SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector M49.
3. Check continuity between in-vehicle sensor harness connector M32 (B) terminal 1 and A/C auto amp. harness connector M49
(A) terminal 26.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK IN-VEHICLE SENSOR
Check in-vehicle sensor. Refer to HAC-80, "
In-Vehicle Sensor Component Inspection".
Is the inspection result normal?
YES >> 1. Replace A/C auto amp. Refer to VTL-7, "Removal and Installation".
2. Go to HAC-23, "
A/C Auto Amp. Self-Diagnosis" and perform self-diagnosis.
NO >> 1. Replace in-vehicle sensor. Refer to VTL-9, "
Removal and Installation".
2. Go to HAC-23, "
A/C Auto Amp. Self-Diagnosis" and perform self-diagnosis.
5.CHECK CIRCUIT CONTINUITY BETWEEN IN-V EHICLE SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector M32 (B) terminal 4 and A/C auto amp. harness connector M50
(A) terminal 32.
4. Check continuity between in-vehicle sensor harness connector M32 (B) terminal 4 and ground.
Is the inspection result normal?
YES >> 1. Replace A/C auto amp. Refer to VTL-7, "Removal and Installation".
2. Go to HAC-23, "
A/C Auto Amp. Self-Diagnosis" and perform self-diagnosis.
NO >> Repair harness or connector.
6.CHECK CIRCUIT CONTINUITY BETW EEN IN-VEHICLE SENSOR MOTOR AND A/C AUTO AMP. (SELF-
DIAGNOSIS CODES 30, 31, 44, 46 OR DTC B2578, B2579)
4 - Ground
: Approx. 5V.
LJIA0089E
1 - 26 : Continuity should exist.
AWIIA0167ZZ
4 - 32: Continuity should exist.
4 - Ground Continuity should not exist.
AWIIA0217ZZ
Revision: April 20092010 QX56

HAC-80
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
IN-VEHICLE SENSOR
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector and in-vehicle sensor con-
nector.
3. Check continuity between in-vehicle sensor harness connector M32 (B) terminal 3 and A/C auto amp. harness connector M50
(A) terminal 31.
4. Check continuity between in-vehicle sensor harness connector M32 (B) terminal 3 and ground.
Is the inspection result normal?
YES >> 1. Replace A/C auto amp. Refer to VTL-7, "Removal and Installation".
2. Go to HAC-23, "
A/C Auto Amp. Self-Diagnosis" and perform self-diagnosis.
NO >> Repair harness or connector.
In-Vehicle Sensor Component InspectionINFOID:0000000005147723
COMPONENT INSPECTION
In-vehicle Sensor
After disconnecting in-vehicle sensor connector M32, measure resis-
tance between terminals 1 and 4 at sensor component side, using
the table below.
If NG, replace in-vehicle sensor. Refer to VTL-9, "
Removal and
Installation".
3 - 31
: Continuity should exist.
2 - Ground : Continuity should exist.
3 - Ground : Continuity should not exist.
AWIIA0168ZZ
Temperature °C ( °F) Resistance kΩ
− 15 (5) 21.40
− 10 (14) 16.15
− 5 (23) 12.29
0 (32) 9.41
5 (41) 7.27
10 (50) 5.66
15 (59) 4.45
20 (68) 3.51
25 (77) 2.79
30 (86) 2.24
35 (95) 1.80
40 (104) 1.45
45 (113) 1.18
AWIIA0816ZZ
Revision: April 20092010 QX56

HAC-82
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
OPTICAL SENSOR
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector and optical sensor connec-
tor.
3. Check continuity between optical sensor harness connector M302 (B) terminals 1 and 2 and A/C auto amp. harness connec-
tor M50 (C) terminal 42 and M49 (A) terminal 1.
4. Check continuity between optical sensor harness connector M302 (B) terminal 1 and 2 and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair harness or connector.
2.CHECK CIRCUIT CONTINUITY BETW EEN OPTICAL SENSOR AND BCM
1. Disconnect BCM connector.
2. Check continuity between optical sensor harness connector M302 (B) terminal 3 and BCM har ness connector M18 (A) termi-
nal 18.
3. Check continuity between optical sensor harness connector M302 (B) terminal 3 and ground.
Is the inspection result normal?
YES >> Replace optical sensor. Refer to VTL-10, "Removal and Installation".
NO >> Repair harness or connector. 1 - 1 : Continuity should exist.
2 - 42 : Continuity should exist.
1, 2 - Ground. : Contin
uity should not exist.
AWIIA1085ZZ
3 - 18: Continuity should exist.
3 - Ground : Continuity should not exist.
AWIIA1078ZZ
Revision: April 20092010 QX56

INTAKE SENSORHAC-83
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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INTAKE SENSOR
System DescriptionINFOID:0000000005147726
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit assembly. It
converts temperature of air after if passes through the evaporator
into a resistance value which is then input to the A/C auto amp.
Intake Sensor Diagnosis ProcedureINFOID:0000000005147727
Regarding Wiring Diagram information, refer to HAC-91, "Wiring Diagram".
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. Using the CON-
SULT-III, DTC B2581 or B2582 is displayed. Without a CONSULT-III,
code 56 or 57 is indicated on A/C auto amp. as a result of conducting
self-diagnosis.
1.CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Disconnect intake sensor connector.
2. Turn ignition switch ON.
3. Check voltage between intake sensor harness connector M146 terminal 2 and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND A/C AUTO AMP.
WJIA0571E
AWIIA0208GB
2 - Ground : Approx. 5V
WJIA1375E
Revision: April 20092010 QX56

HAC-84
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INTAKE SENSOR
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between intake sensor harness connector
M146 (B) terminal 1 and A/C auto amp. harness connector M49
(A) terminal 26.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK INTAKE SENSOR
Check intake sensor. Refer to HAC-84, "
Intake Sensor Component Inspection".
Is the inspection result normal?
YES >> 1. Replace A/C auto amp. Refer to VTL-7, "Removal and Installation".
2. Go to HAC-23, "
A/C Auto Amp. Self-Diagnosis" and perform self-diagnosis.
NO >> 1. Replace intake sensor. Refer to VTL-11, "
Removal and Installation".
2. Go to HAC-23, "
A/C Auto Amp. Self-Diagnosis" and perform self-diagnosis.
4.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between intake sensor harness connector M146 (B) terminal 2 and A/C auto amp. harness connector M49
(A) terminal 11.
4. Check continuity between intake sensor harness connector M146 (B) terminal 2 and ground.
Is the inspection result normal?
YES >> 1. Replace A/C auto amp. Refer to VTL-7, "Removal and Installation".
2. Go to HAC-23, "
A/C Auto Amp. Self-Diagnosis" and perform self-diagnosis.
NO >> Repair harness or connector.
Intake Sensor Component InspectionINFOID:0000000005147728
COMPONENT INSPECTION
Intake Sensor
1 - 26 : Continuity should exist.
AWIIA0209ZZ
2 - 11: Continuity should exist.
2 - Ground : Continuity should not exist.
AWIIA0216ZZ
Revision: April 20092010 QX56

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
HAC-87
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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Check main power supply and ground circuit. Refer to HAC-87, "A/C Auto Amp Power and Ground Diagnosis
Procedure".
Is the inspection result normal?
YES >> System OK.
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
A/C Auto Amp Power and Ground Diagnosis ProcedureINFOID:0000000005147731
Regarding Wiring Diagram information, refer to HAC-91, "Wiring Diagram".
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
1. CHECK POWER SUPPLY CIRCUITS FOR A/C AUTO AMP.
1. Turn ignition switch ON.
2. Check voltage between A/C auto amp. harness connector M49 (B) terminal 15 and M50 (A) terminal 27, and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to PG-69, "
Terminal
Arrangement".
• If fuses are OK, check harness for open circuit. Repair or replace as necessary.
• If fuses are NG, replace fuse and check harness fo r short circuit. Repair or replace as neces-
sary.
2. CHECK GROUND CIRCUIT FOR A/C AUTO AMP.
AWIIA0212GB
Terminals Ignition switch position
(+)
(-) OFF ACC ON
A/C auto
amp. con- nector Te r m i n a l N o .
M49 15 GroundApprox. 0V Approx. 0V
Battery
voltage
M50 27 Battery
voltage Battery
voltage Battery
voltage
AWIIA1073ZZ
Revision: April 20092010 QX56

HAC-88
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
POWER SUPPLY AND GROUND
CIRCUIT FOR CONTROLLER
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connectors.
3. Check continuity between A/C auto amp. harness connector
M50 terminal 36 and ground.
Is the inspection result normal?
OK >> Replace A/C auto amp. Refer to VTL-7, "Removal and
Installation".
NG >> Repair harness or connector. 36 - Ground
: Continuity should exist.
AWIIA0214ZZ
Revision: April 20092010 QX56