Infiniti QX56 (JA60). Manual - part 602

 

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Infiniti QX56 (JA60). Manual - part 602

 

 

REAR AIR CONTROL SYSTEM

HAC-65

< 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 43 and terminal 44.

Is the inspection result normal?

YES

>> Replace A/C auto amp.

NO

>> GO TO 7.

7.

CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND 

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

terminal 43, 44 and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace harness as necessary.

8.

CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN 

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

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

M50 (A) terminal 43, 44 and the mode door motor (rear) harness

connector B156 (B) terminal 5, 6.

Is the inspection result normal?

YES

>> Replace mode door motor. Refer to 

VTL-31, "Removal

and Installation"

.

NO

>> Repair or replace harness as necessary.

9.

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

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

minal 43 and terminal 44 while pressing the mode switch to the
FLOOR (

) mode.

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 MODE DOOR MOTOR (REAR) PBR POWER AND GROUND

Continuity should exist.

AWIIA0190ZZ

43 - Ground

: Continuity should not exist.

44 - Ground

: Continuity should not exist.

AWIIA0192ZZ

5 - 43

: Continuity should exist.

6 - 44

: Continuity should exist.

AWIIA0191ZZ

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M50

44 43

Press 
mode 

switch 

(rear) 

Battery 
voltage

AWIIA0196ZZ

HAC-66

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

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 mode door motor (rear) harness connector.

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

nector B156 (B) terminal 3, 1 and A/C auto amp. harness con-

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

Is the inspection result normal?

YES

>> Replace mode 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 the A/C auto amp.

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

AWIIA0099ZZ

Continuity should exist.

AWIIA0101ZZ

28 - 1

: Continuity should exist.

3 - 3

: Continuity should exist.

AWIIA0102ZZ

Continuity should not exist.

AWIIA0100ZZ

REAR AIR CONTROL SYSTEM

HAC-67

< 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 30 and ground while cycling mode switch through all modes.

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 mode door motor harness connector and A/C

auto amp. harness connector.

3. Check continuity between mode door motor harness connector

B156 (B) terminal 2 and A/C auto amp. harness connector M50

(A) terminal 30.

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 30 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.

 Voltage

: Approx. 1V - 4.5V

AWIIA0194ZZ

Continuity should exist.

AWIIA0195ZZ

Continuity should not exist.

AWIIA0193ZZ

HAC-68

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MAGNET CLUTCH

MAGNET CLUTCH

System Description

INFOID:0000000005147713

SYSTEM DESCRIPTION

The A/C auto amp. controls compressor operation based on ambient and intake temperature and a signal

from ECM.

Low Temperature Protection Control

The A/C auto amp. will turn the compressor ON or OFF as determined by a signal detected by the intake sen-

sor and the ambient sensor.

When intake air temperature is higher than the preset value, the compressor turns ON. The compressor turns

OFF when intake air temperature is lower than the preset value. That preset value is dependent on the ambi-

ent temperature, refer to the following table.

Magnet Clutch Component Function Check

INFOID:0000000005147714

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1. Turn ignition switch ON.

2. Press the A/C switch.
3. Press vent switch (

).

4. Display shows 

, A/C. Confirm that the compressor clutch engages (sound or visual inspection). (Dis-

charge air and blower speed will depend on ambient, in-vehicle and set temperatures.)

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-68, "Magnet Clutch Diagnosis Procedure"

.

Magnet Clutch Diagnosis Procedure

INFOID:0000000005147715

Regarding Wiring Diagram information, refer to 

HAC-91, "Wiring Diagram"

.

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

Ambient temperature 

°C (°F) Compressor ON intake temperature °C (°F)

Compressor OFF intake temperature 

°C (°F)

0 (32)

5.5 (42)

5.0 (41)

10 (50)

5.5 (42)

5.0 (41)

20 (68)

5.5 (42)

5.0 (41)

30 (86)

4.0 (39)

3.5 (38)

40 (104)

3.5 (38)

3.0 (37)

50 (122)

3.5 (38)

3.0 (37)

 

 

 

 

 

 

 

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