Infiniti QX56 (JA60). Manual - part 601

 

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Infiniti QX56 (JA60). Manual - part 601

 

 

REAR AIR CONTROL SYSTEM

HAC-61

< 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 49 and terminal 50.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> GO TO 7.

7.

CHECK AIR MIX DOOR MOTOR (REAR) CIRCUITS FOR SHORT TO GROUND 

Check continuity between A/C auto amp. harness connector M50

terminal 49, 50 and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace harness as necessary.

8.

CHECK AIR MIX DOOR MOTOR (REAR) CIRCUITS FOR OPEN 

1. Disconnect the air mix door motor (rear) harness connector.

2. Check continuity between A/C auto amp. harness connector

M50 (A) terminal 49, 50 and the air mix door motor (rear) har-

ness connector B155 (B) terminal 1, 6.

Is the inspection result normal?

YES

>> Replace air mix door motor (rear). Refer to 

VTL-31,

"Removal and Installation"

.

NO

>> Repair or replace harness as necessary.

9.

CHECK A/C AUTO AMP. OWER AND GROUND FOR AIR MIX DOOR MOTOR (REAR)

1. Rotate temperature control dial (front) to maximum cold.

2. Check voltage between A/C auto amp. harness connector M50

terminal 49 and terminal 50 while rotating temperature control

dial (rear) to maximum heat.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

10.

CHECK A/C AUTO AMP. FOR AIR MIX DOOR MOTOR (REAR) PBR POWER AND GROUND

Continuity should exist.

AWIIA0138ZZ

49 - Ground

: Continuity should not exist.

50 - Ground

: Continuity should not exist.

AWIIA0136ZZ

49 - 1

: Continuity should exist.

50 - 6

: Continuity should exist.

AWIIA0139ZZ

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M50

50 49

Rotate temp 

control dial

Battery 
voltage

AWIIA0137ZZ

HAC-62

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

1. 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 14.

NO

>> GO TO 11.

11.

CHECK PBR REFERENCE VOLTAGE 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 13.

NO

>> GO TO 12.

12.

CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN

1. Disconnect the air mix door motor (rear) harness connector.

2. Check continuity between air mix door motor (rear) harness con-

nector B155 (B) terminal 3, 2 and A/C auto amp. harness con-

nector M50 (A) terminal 28 and M49 (C) terminal 3.

Is the inspection result normal?

YES

>> Replace air mix door motor (rear). Refer to 

VTL-31,

"Removal and Installation"

.

NO

>> Repair or replace harness as necessary.

13.

CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND

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. 

VTL-7, "Removal and Installa-

tion"

.

NO

>> Repair or replace harness as necessary.

14.

CHECK PBR FEEDBACK VOLTAGE

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

A/C auto amp.: M49, M50

28

3

5V

AWIIA0118ZZ

Continuity should exist.

AWIIA0120ZZ

28 - 3

: Continuity should exist.

3 - 2

: Continuity should exist.

AWIIA0121ZZ

Continuity should not exist.

AWIIA0119ZZ

REAR AIR CONTROL SYSTEM

HAC-63

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Check voltage between A/C auto amp. harness connector M50 ter-

minal 33 and ground while rotating temperature control dial (rear)

from maximum cold to maximum heat.

Is the inspection result normal?

YES

>> System OK.

NO

>> GO TO 15.

15.

CHECK PBR FEEDBACK CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect the air mix door motor (rear) harness connector and

A/C auto amp. harness connector.

3. Check continuity between air mix door motor (rear) harness con-

nector B155 (B) terminal 4 and A/C auto amp. harness connec-

tor M50 (A) terminal 33.

Is the inspection result normal?

YES

>> GO TO 16. 

NO

>> Repair or replace harness as necessary.

16.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND

Check continuity between A/C auto amp. harness connector M50

terminal 33 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.

Mode Door Motor (Rear) Diagnosis Procedure

INFOID:0000000005147712

Regarding Wiring Diagram information, refer to 

HAC-91, "Wiring Diagram"

.

DIAGNOSTIC PROCEDURE INOPERATIVE MODE DOOR MOTOR (REAR)

1.

CHECK REAR AIR CONTROL (FRONT) POWER SUPPLY

1. Disconnect rear air control (front) harness connector.

2. Turn ignition switch ON.

3. Check voltage between rear air control (front) harness connec-

tor R108 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK REAR AIR CONTROL (FRONT) LIN BUS VOLTAGE

 Voltage

: Approx. 1V - 4.5V

AWIIA0140ZZ

Continuity should exist.

AWIIA0142ZZ

Continuity should not exist.

AWIIA0141ZZ

Battery voltage should exist.

AWIIA0182ZZ

HAC-64

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

Check voltage between rear air control (front) harness connector

R108 terminal 5 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK REAR AIR CONTROL (FRONT) GROUND CIRCUITS

1. Turn ignition switch OFF.

2. Check continuity between rear air control (front) harness con-

nector R108 terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

4.

CHECK LIN BUS VOLTAGE CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect the mode door motor (rear) harness connector.

3. Check continuity between rear air control (front) harness con-

nector R108 (B) terminal 5 and A/C auto amp. harness connec-

tor M50 (A) terminal 48.

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.

5.

CHECK A/C AUTO AMP. POWER AND GROUND FOR MODE DOOR MOTOR (REAR) 

1. Reconnect all disconnected parts.

2. Turn ignition switch ON.
3. Press the mode switch to the FLOOR (

) mode.

4. Check voltage between A/C auto amp. harness connector M50

terminal 43 and terminal 44 while pressing the mode switch to
the vent (

) mode.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 6.

6.

CHECK MODE DOOR MOTOR AND CIRCUITS FOR OPEN

Battery voltage should exist.

AWIIA0183ZZ

Continuity should exist.

AWIIA0184ZZ

48 - 5

: Continuity should exist.

AWIIA0185ZZ

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M50

43 44

Press 
mode 

switch 

(rear) 

Battery 
voltage

AWIIA0189ZZ

 

 

 

 

 

 

 

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