Infiniti QX56 (Z62). Manual - part 809

REAR A/C CONTROL COMMUNICATION SIGNAL

HAC-127

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

REAR A/C CONTROL COMMUNICATION SIGNAL

Diagnosis Procedure

INFOID:0000000006275975

1.

CHECK COMMUNICATION SIGNAL CIRCUIT (A/C AUTO AMP. 

→

 REAR A/C CONTROL) FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect rear A/C control and A/C auto amp. connector.

3.

Check continuity between rear A/C control harness connector and A/C auto amp. harness connector. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK COMMUNICATION SIGNAL CIRCUIT (A/C AUTO AMP. 

→

 REAR A/C CONTROL) FOR SHORT

Check continuity between rear A/C control harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK COMMUNICATION SIGNAL CIRCUIT (REAR A/C CONTROL 

→

 A/C AUTO AMP.) CIRCUIT FOR

OPEN

Check continuity between rear A/C control harness connector and A/C auto amp. harness connector. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK COMMUNICATION SIGNAL CIRCUIT (REAR A/C CONTROL 

→

 A/C AUTO AMP.) CIRCUIT FOR

SHORT

Check continuity between rear A/C control harness connector and ground. 

Is the inspection result normal?

YES

>> Replace A/C auto amp.. Refer to 

HAC-146, "Removal and Installation"

. 

NO

>> Repair harness or connector.

Rear A/C control

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M41

9

M50

11

 

Existed

Rear A/C control

—

Continuity

Connector

Terminal

M41

9

Ground

 Not existed

Rear A/C control

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M41

10

M50

31

 

Existed

Rear A/C control

—

Continuity

Connector

Terminal

M41

10

Ground

 Not existed

HAC-128

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

REAR A/C SOLENOID VALVE

REAR A/C SOLENOID VALVE

Diagnosis Procedure

INFOID:0000000006275976

1.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check 10A fuse [No.4, located in fuse block (J/B)].
NOTE:
Refer to 

PG-140, "Fuse, Connector and Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

2.

CHECK REAR A/C SOLENOID VALVE POWER SUPPLY

1.

Disconnect rear A/C solenoid valve connector.

2.

Turn ignition switch ON and front air conditioning system ON.

3.

Check voltage between rear A/C solenoid valve harness connector and ground when rear blower motor is
operated.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK REAR A/C SOLENOID VALVE GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between rear A/C solenoid valve harness connector and ground.

Is the inspection result normal?

YES

>> Replace rear expansion valve assembly. Refer to 

HA-49, "EXPANSION VALVE : Removal and

Installation"

.

NO

>> Repair harness or connector.

4.

CHECK REAR A/C RELAY POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect rear A/C relay connector.

3.

Turn ignition switch ON.

4.

Check voltage between rear A/C relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

+

−

Condition

Voltage

(Approx.)

Rear A/C solenoid valve

Connector

Terminal

B207

1

Ground

Rear blower motor

ON

Battery voltage

OFF

0 V

Rear A/C solenoid valve

—

Continuity

Connector

Terminal

B207

2

Ground

Existed

+

−

Voltage

(Approx.)

Rear A/C relay

Connector

Terminal

E87

1

Ground

Battery voltage

3

REAR A/C SOLENOID VALVE

HAC-129

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

NO

>> Repair harness or connector between rear A/C relay and fuse block (J/B).

5.

CHECK REAR A/C RERAY CONTROL CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector.

3.

Check continuity between rear A/C relay harness connector and A/C auto amp. harness connector.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK REAR A/C RELAY CONTROL CIRCUIT FOR SHORT

Check continuity between rear A/C relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK REAR A/C SOLENOID VALVE POWER SUPPLY CIRCUIT

Check continuity between rear A/C relay harness connector and rear A/C solenoid valve harness connector.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair harness or connector.

8.

CHECK REAR A/C RELAY

Check rear A/C relay. Refer to 

HAC-129, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp.. Refer to 

HAC-146, "Removal and Installation"

.

NO

>> Replace rear A/C relay.

Component Inspection

INFOID:0000000006275977

1.

CHECK REAR A/C RELAY

1.

Remove rear A/C relay. 

Rear A/C relay

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

E87

2

M50

38

Existed

Rear A/C relay

—

Continuity

Connector

Terminal

E87

2

Ground

Not existed

Rear A/C relay

Rear A/C solenoid valve

Continuity

Connector

Terminal

Connector

Terminal

E87

5

B207

1

Existed

HAC-130

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

REAR A/C SOLENOID VALVE

2.

Check continuity between the rear A/C relay terminal 3 and 5
when the voltage is supplied between terminal 1 and 2. 

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace rear A/C relay.

Blower relay

Voltage

Continuity

Terminal

3

5

ON

Existed

OFF

Not existed

JSIIA1551ZZ