Nissan Quest E52. Manual - part 740

HAC-90

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

A/C AUTO AMP.

A/C AUTO AMP.

Component Function Check

INFOID:0000000009652548

1.

PERFORM SELF-DIAGNOSIS FUNCTION STEP 5-2

1.

Turn ignition switch ON.

2.

Perform self-diagnosis function step 5-2. Erase self diagnosis result. Refer to 

HAC-47, "On Board Diagno-

sis Function"

.

3.

Turn ignition switch OFF.

4.

Turn ignition switch ON.

5.

Perform self-diagnosis function step 5-2 again. Refer to 

HAC-47, "On Board Diagnosis Function"

.

6.

Check self-diagnosis result.

Is “40” displayed?

YES

>> Refer to 

HAC-90, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009652549

1.

REPLACE FRONT A/C CONTROL (A/C AUTO AMP.)

Replace front A/C control (A/C auto amp.). Refer to 

HAC-143, "Removal and Installation"

.

>> INSPECTION END

REAR A/C CONTROL COMMUNICATION SIGNAL

HAC-91

< 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:0000000009652550

1.

CHECK SYMPTOM

Check symptom (A or B).

Which symptom is detected?

A

>> GO TO 2.

B

>> GO TO 5.

2.

CHECK COMMUNICATION SIGNAL (REAR A/C CONTROL 

→

 A/C AUTO AMP.) CIRCUIT FOR OUTPUT

SIGNAL

1.

Turn ignition switch OFF. 

2.

Disconnect rear A/C control connector. 

3.

Turn ignition switch ON. 

4.

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

Is the inspection result normal?

YES

>> Replace rear A/C control. Refer to 

HAC-144, "Removal and Installation"

. 

NO

>> GO TO 3.

3.

CHECK COMMUNICATION SIGNAL (REAR A/C CONTROL 

→

 A/C AUTO AMP.) CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect 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 4.

NO

>> Repair harness or connector.

4.

CHECK COMMUNICATION SIGNAL (REAR A/C CONTROL 

→

 A/C AUTO AMP.) CIRCUIT FOR SHORT

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

Symptom

A

Rear air conditioning 
cannot be controlled 

by rear A/C control.

Operation status of rear air conditioning is indicated on rear A/C control display.

B

Operation status of rear air conditioning is not indicated on rear A/C control dis-
play.

+

−

Voltage

(Approx.)

Rear A/C control

Connector

Terminal

R16 (without rear 

entertainment)

10

Ground

5 V

R101 (with rear en-

tertainment)

Rear A/C control

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

R16 (without rear 

entertainment)

10

M50

33

 Existed

R101 (with rear en-

tertainment)

HAC-92

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

REAR A/C CONTROL COMMUNICATION SIGNAL

Is the inspection result normal?

YES

>> Replace front A/C control (A/C auto amp.). Refer to 

HAC-143, "Removal and Installation"

.

NO

>> Repair harness or connector.

5.

CHECK COMMUNICATION SIGNAL (A/C AUTO AMP. 

→

 REAR A/C CONTROL) CIRCUIT FOR OUTPUT

SIGNAL

1.

Turn ignition switch OFF. 

2.

Disconnect A/C auto amp. connector. 

3.

Turn ignition switch ON. 

4.

Check voltage between A/C auto amp. harness connector and ground. 

Is the inspection result normal?

YES

>> Replace front A/C control (A/C auto amp.). Refer to 

HAC-143, "Removal and Installation"

.

NO

>> GO TO 6.

6.

CHECK COMMUNICATION SIGNAL (A/C AUTO AMP. 

→

 REAR A/C CONTROL) CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect rear A/C control 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 7.

NO

>> Repair harness or connector.

7.

CHECK COMMUNICATION SIGNAL (A/C AUTO AMP. 

→

 REAR A/C CONTROL) CIRCUIT FOR SHORT

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

Is the inspection result normal?

YES

>> Check rear A/C control power supply circuit. Refer to 

HAC-88, "REAR A/C CONTROL : Diagnosis

Procedure"

.

Rear A/C control

—

Continuity

Connector

Terminal

R16 (without rear 

entertainment)

10

Ground

 Not existed

R101 (with rear en-

tertainment)

+

−

Voltage

(Approx.)

A/C auto amp.

Connector

Terminal

M50

32

Ground

5 V

Rear A/C control

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

R16 (without rear 

entertainment)

9

M50

32

 

Existed

R101 (with rear en-

tertainment)

Rear A/C control

—

Continuity

Connector

Terminal

R16 (without rear 

entertainment)

9

Ground

 Not existed

R101 (with rear en-

tertainment)

REAR A/C CONTROL COMMUNICATION SIGNAL

HAC-93

< 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.