Infiniti QX56 (JA60). Manual - part 594

AIR MIX DOOR MOTOR

HAC-33

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

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 VOLTAGE AND GROUND CIRCUITS

Continuity should exist.

AWIIA0116ZZ

17 - 1

: Continuity should exist.

18 - 6

: Continuity should exist.

AWIIA0117ZZ

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

A/C auto amp.: M50, M49

28 

3

5V

AWIIA0118ZZ

Continuity should not exist.

AWIIA0119ZZ

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 VOLTAGE 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

AIR MIX DOOR MOTOR

HAC-35

< 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 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 (Passenger) Component Function Check

INFOID:0000000005272349

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL 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 OPERATIONAL 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 (Passenger) Diagnosis Procedure

INFOID: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

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M49

2 14

Rotate temp 

control dial

Battery 
voltage

AWIIA0125ZZ

HAC-36

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

NG

>> GO TO 2.

2.

CHECK AIR MIX DOOR MOTOR (PASSENGER) 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 (PASSENGER) 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

Terminals

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