Nissan Sentra. Manual - part 559

HAC-84

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

POWER SUPPLY AND GROUND CIRCUIT

NO

>> Perform trouble diagnosis for the A/C switch assembly. Refer to 

HAC-84, "A/C SWITCH ASSEM-

BLY : Diagnosis Procedure"

.

A/C SWITCH ASSEMBLY : Diagnosis Procedure

INFOID:0000000009757681

Regarding Wiring Diagram information, refer to 

HAC-41, "Wiring Diagram"

.

1.

CHECK A/C SWITCH ASSEMBLY POWER SUPPLY

1. Disconnect the A/C switch assembly connector.

2. Turn ignition switch ON. 

3. Check voltage between A/C switch assembly harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FUSE

Check 10A fuse [No.5, located in the fuse block (J/B)].

NOTE:

Refer to 

PG-47, "Terminal Arrangement"

.

Is the inspection result normal?

YES

>> Check harness for open circuit. Repair or replace if necessary.

NO

>> Check harness for short circuit. Repair or replace if necessary.

3.

CHECK A/C SWITCH ASSEMBLY GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between A/C switch assembly harness connector and ground. 

Is the inspection result normal?

YES

>> Replace the A/C switch assembly. Refer to 

HAC-104, "Removal and Installation"

.

NO

>> Repair the harnesses or connectors.

(+)

(

−)

Voltage

(Approx.)

A/C switch assembly

Connector

Terminal

M59

4

Ground

Battery voltage

A/C switch assembly

—

Continuity

Connector

Terminal

M59

1

Ground

Yes

A/C SWITCH ASSEMBLY SIGNAL CIRCUIT

HAC-85

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

A/C SWITCH ASSEMBLY SIGNAL CIRCUIT

Diagnosis Procedure

INFOID:0000000009757682

Regarding Wiring Diagram information, refer to 

HAC-41, "Wiring Diagram"

.

1.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT

1. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC. 

2. Check if any DTC No. is displayed in the self-diagnosis results. 

NOTE:

If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to 

HAC-

58, "DTC Logic"

 (U1000) or 

HAC-59, "DTC Logic"

 (U1010). 

Is any DTC No. displayed?

YES

>> Perform diagnosis for the applicable DTC. Refer to 

HAC-38, "DTC Index"

. 

NO

>> GO TO 2.

2.

CHECK RX (A/C SWITCH ASSEMBLY 

→ A/C AUTO AMP.) CIRCUIT CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect the A/C switch assembly and the A/C auto amp. connectors.

3. Check continuity between A/C switch assembly harness connector and A/C auto amp. harness connector. 

4. Check continuity between A/C switch assembly harness connector M79 terminal 10 and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK TX (A/C AUTO AMP. 

→ A/C SWITCH ASSEMBLY) CIRCUIT CONTINUITY

1. Check continuity between A/C switch assembly harness connector and A/C auto amp. harness connector.

2. Check continuity between A/C switch assembly harness connector M79 terminal 9 and ground. 

Is the inspection result normal?

YES

>> Perform trouble diagnosis for the A/C switch assembly. Refer to 

HAC-84, "A/C SWITCH ASSEM-

BLY : Diagnosis Procedure"

. 

NO

>> Repair harness or connector.

A/C switch assembly

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M59

8

M34

27

Yes

A/C switch assembly

—

Continuity

Connector

Terminal

M59

8

Ground

No

A/C switch assembly

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M59

9

M34

28

Yes

A/C switch assembly

—

Continuity

Connector

Terminal

M59

9

Ground

No

HAC-86

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

A/C ON SIGNAL

A/C ON SIGNAL

Component Function Check

INFOID:0000000009757683

1.

CHECK A/C ON SIGNAL

With CONSULT

1. Turn ignition switch ON.

2. Operate blower motor.

3. Select “AIR CONDITIONER” of “BCM” using CONSULT.

4. Select “AIR COND SW” in “DATA MONITOR” mode.

5. Check A/C ON signal when the A/C switch is operated.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Refer to 

HAC-86, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009757684

Regarding Wiring Diagram information, refer to 

HAC-41, "Wiring Diagram"

.

1.

CHECK A/C ON SIGNAL

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Turn ignition switch ON.

4. Check output waveform between A/C auto amp. harness connector and ground with using oscilloscope.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-105, "Removal and Installation"

.

NO

>> GO TO 2.

2.

CHECK A/C ON SIGNAL CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect BCM connector.

3. Check continuity between A/C auto amp. harness connector and BCM harness connector.

Monitor item

Condition

Status

AIR COND SW

A/C switch

ON (A/C indicator: 
ON)

On

OFF (A/C indicator: 
OFF)

Off

+

−

Output waveform

A/C auto amp.

Connector

Terminal

M34

15

Ground

JPMIA0012GB

A/C ON SIGNAL

HAC-87

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK A/C ON SIGNAL CIRCUIT FOR SHORT

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

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-73, "Removal and Installation"

.

NO

>> Repair harness or connector.

A/C auto amp.

BCM

Continuity

Connector

Terminal

Connector

Terminal

M34

15

M84

27

Yes

A/C auto amp.

—

Continuity

Connector

Terminal

M34

15

Ground

No