Infiniti QX56 (JA60). Manual - part 596

 

  Index      Infiniti     Infiniti QX56 (JA60) - service repair manual 2010 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  594  595  596  597   ..

 

 

Infiniti QX56 (JA60). Manual - part 596

 

 

INTAKE DOOR MOTOR

HAC-41

< 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, 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

Terminals

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

HAC-42

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DEFROSTER DOOR MOTOR CIRCUIT

DEFROSTER DOOR MOTOR CIRCUIT

System Description

INFOID:0000000005147697

SYSTEM DESCRIPTION

Component Parts

Defroster door control system components are:

• A/C auto amp.

• A/C and AV switch assembly

• Defroster door motor

• PBR (Built into defroster door motor)

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• Intake sensor

System Operation

The A/C auto amp. determines defroster door position based on the position of the defroster switch. When the

defroster switch is depressed, the defroster door motor rotates directing air to the defroster ducts. When any

mode other than defroster is selected, the defroster motor rotates in the opposite direction closing off air flow

to the defroster ducts.

In the AUTO mode, the A/C auto amp. determines defroster door position based on the ambient temperature,

the intake air temperature and the in-vehicle temperature.

COMPONENT DESCRIPTION

Defroster door motor 

The defroster door motor is attached to the front heater & cooling

unit assembly. The A/C auto amp. sends a voltage to rotate to the

defroster door directing the air flow either to the defroster ducts, or to

the floor ducts, depending on which way the voltage and ground are

applied to the motor leads. Motor rotation is conveyed to a lever

which activates the defroster door.

AWIIA0151GB

WJIA0592E

DEFROSTER DOOR MOTOR CIRCUIT

HAC-43

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Defroster Door Motor Component Function Check

INFOID:0000000005147698

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL 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).
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-43, "Defroster Door Motor Diagnosis Procedure"

.

Defroster Door Motor Diagnosis Procedure

INFOID:0000000005147699

Regarding Wiring Diagram information, refer to 

HAC-91, "Wiring Diagram"

.

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.

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 

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M49

24 23

Press de-

froster 
switch

Battery 
voltage

AWIIA0152ZZ

23 - Ground

: Continuity should not exist.

24 - Ground

: Continuity should not exist.

AWIIA0153ZZ

HAC-44

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DEFROSTER DOOR MOTOR CIRCUIT

1. Press the defroster switch (

).

2. Check voltage between A/C auto amp. harness connector M49

terminal 23 and terminal 24 and press 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-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

Connector

Terminals

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

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

A/C auto amp.: M50, M49

28

3

5V

AWIIA0118ZZ

 

 

 

 

 

 

 

Content   ..  594  595  596  597   ..