Infiniti QX56 (JA60). Manual - part 592

 

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Infiniti QX56 (JA60). Manual - part 592

 

 

MODE DOOR MOTOR

HAC-25

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

COMPONENT DIAGNOSIS

MODE DOOR MOTOR

System Description

INFOID:0000000005147687

SYSTEM DESCRIPTION

Component Parts

Mode door control system components are:

• A/C auto amp.

• A/C and AV switch assembly

• Mode door motor (front)

• PBR (built into mode door motor)

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• Intake sensor

System Operation

The mode door position (vent, B/L, foot, D/F, and defrost) is set by the A/C auto amp. by means of the mode

door motor (front). When a mode door position is selected on the A/C auto amp., voltage is applied to one cir-

cuit of the mode door motor (front) while ground is applied to the other circuit, causing the mode door motor

(front) to rotate. The direction of rotation is determined by which circuit has voltage applied to it, and which one

has ground applied to it. The A/C auto amp. monitors the mode door position by measuring the voltage signal

on the PBR circuit.

In AUTO mode the mode door position is set by the A/C auto amp. which determines the proper position

based on inputs from the in-vehicle sensor, ambient sensor, optical sensor, intake sensor, and the temperature

selected by the driver or passenger.

Mode Door Control Specification

COMPONENT DESCRIPTION

Mode Door Motor (Front)

AWIIA0092GB

AWIIA0093GB

HAC-26

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR MOTOR

The mode door motor (front) is attached to the heater & cooling unit

assembly. It rotates so that air is discharged from the outlet as indi-

cated by the A/C auto amp. Motor rotation is conveyed to a link

which activates the mode door.

Mode Door Motor (Front) Component Function Check

INFOID:0000000005147688

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR

1. Press mode switch four times and then press the 

 (DEF) switch. Each position indicator should change

shape (on display).

2. Confirm that discharge air comes out according to the air distribution table. Refer to 

HAC-16, "Discharge

Air Flow (Front)"

.

NOTE:

Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH

 when DEF (

) or D/F (

) is selected.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-26, "Mode Door Motor (Front) Diagnosis Procedure"

.

Mode Door Motor (Front) Diagnosis Procedure

INFOID:0000000005147689

Regarding Wiring Diagram information, refer to 

HAC-91, "Wiring Diagram"

.

SYMPTOM:

• Air outlet does not change.

• Mode door motor does not operate normally.

1.

CHECK A/C AUTO AMP. FOR POWER AND GROUND 

1. Turn ignition switch ON.
2. Press the mode switch to the B/L (

) mode.

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

terminal 19 and terminal 20 while pressing the mode switch to
the floor (

) mode.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND 

WJIA0587E

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M49

20

19

Press 
mode 

switch

Battery 
voltage

AWIIA0095ZZ

MODE DOOR MOTOR

HAC-27

< 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 19, 20 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 mode switch to the D/F (

) mode.

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

terminal 19 and terminal 20 while pressing the mode switch to
the vent (

) mode.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

4.

CHECK MODE 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 19 and terminal 20.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN 

1. Disconnect the mode door motor harness connector.

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

M49 (A) terminal 19, 20 and the mode door motor harness con-

nector M142 (B) terminal 5, 6.

Is the inspection result normal?

YES

>> Replace mode door motor. Refer to 

VTL-29, "Removal

and Installation"

.

NO

>> Repair or replace harness as necessary.

6.

CHECK A/C AUTO AMP. FOR PBR POWER AND GROUND

19 - Ground

: Continuity should not exist.

20 - Ground

: Continuity should not exist.

AWIIA0096ZZ

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M49

19 20

Press 
mode 

switch

Battery 
voltage

AWIIA0097ZZ

Continuity should exist.

AWIIA0098ZZ

5 - 19

: Continuity should exist.

6 - 20

: Continuity should exist.

AWIIA0094ZZ

HAC-28

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR MOTOR

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

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 mode door motor harness connector.

2. Check continuity between mode door motor harness connector

M142 (B) terminal 3, 1 and A/C auto amp. harness connector

M49 (C) terminal 3, M50 (A) terminal 28.

Is the inspection result normal?

YES

>> Replace mode door motor. Refer to 

VTL-29, "Removal

and Installation"

.

NO

>> Repair or replace harness as necessary.

10.

CHECK PBR FEEDBACK VOLTAGE

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

A/C auto amp.: M49, M50

28 

3

5V

AWIIA0099ZZ

Continuity should not exist.

AWIIA0100ZZ

Continuity should exist.

AWIIA0101ZZ

28 - 1

: Continuity should exist.

3 - 3

: Continuity should exist.

AWIIA0102ZZ

 

 

 

 

 

 

 

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