Nissan Sentra. Manual - part 577

HAC-156

< BASIC INSPECTION >

[MANUAL AIR CONDITIONER]

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

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DETAILED FLOW

1.

LISTEN TO CUSTOMER COMPLAINT

Listen to customer complaint. Get detailed information about the conditions and environment when the symp-

tom occurs.

>> GO TO 2.

2.

VERIFY THE SYMPTOM WITH OPERATIONAL CHECK

Verify the symptom with operational check. Refer to 

HAC-157, "Work Procedure"

. 

>> GO TO 3.

3.

GO TO APPROPRIATE TROUBLE DIAGNOSIS

Go to appropriate trouble diagnosis. Refer to 

HAC-181, "Symptom Table"

.

>> GO TO 4.

4.

REPAIR OR REPLACE

Repair or replace the specific parts.

>> GO TO 5.

5.

FINAL CHECK

Final check.
Is the inspection result normal?

YES

>> Inspection End.

NO

>> GO TO 3.

OPERATION INSPECTION

HAC-157

< BASIC INSPECTION >

[MANUAL AIR CONDITIONER]

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OPERATION INSPECTION

Work Procedure

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DESCRIPTION

The purpose of the operational check is to check that the individual system operates normally.

OPERATION INSPECTION

1.

CHECK BLOWER

1. Rotate the blower control dial clockwise one detent. Blower should operate on low speed.

2. Rotate the blower control dial one detent at a time, and continue checking blower speed until all speeds

are checked.

3. Leave blower on maximum speed. 
Is the test result normal?

YES

>> GO TO 2.

NO

>> Refer to 

HAC-174, "Diagnosis Procedure"

.

2.

CHECK A/C SWITCH LED

1. Press A/C switch.

2. A/C switch indicator should turn ON.
Is the test result normal?

YES

>> GO TO 3.

NO

>> Refer to 

HAC-168, "Diagnosis Procedure"

.

3.

CHECK A/C SWITCH

Confirm that the compressor clutch engages (sound or visual inspection).
Is the test result normal?

YES

>> GO TO 4.

NO

>> Refer to 

HAC-178, "Diagnosis Procedure"

.

4.

CHECK FRONT AIR CONTROL MODE LEDS

1. Press D/F (

), FOOT (

), B/L 

, and VENT 

, MAX A/C, and DEF (

). 

2. Each button indicator should illuminate.
Is the test result normal?

YES

>> GO TO 5.

NO

>> Refer to 

HAC-160, "A/C SWITCH ASSEMBLY : Diagnosis Procedure"

.

5.

CHECK DISCHARGE AIR

1. Press D/F (

), FOOT (

), B/L 

, and VENT 

 and DEF (

). 

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

HAC-123, "Door Con-

trol"

.

Is the test result normal?

YES

>> GO TO 6.

NO

>> Refer to 

HAC-181, "Symptom Table"

.

6.

CHECK REC LED

1. Press DEF (

) and make sure LED is off.

2. Make sure VENT (

) or B/L (

) is selected.

3. Press REC (

) switch one time. REC indicator should illuminate.

Check condition : Engine running at normal operating temperature.
Check condition : Blower control dial in OFF position.
Check condition : REC off (LED extinguished).
Check condition : VENT selected (LED illuminated).
Check condition : DEF off (LED extinguished).

HAC-158

< BASIC INSPECTION >

[MANUAL AIR CONDITIONER]

OPERATION INSPECTION

4. Press REC (

) switch one more time. REC indicator should go off.

Is the test result normal?

YES

>> GO TO 7.

NO

>> Refer to 

HAC-160, "A/C SWITCH ASSEMBLY : Diagnosis Procedure"

.

7.

CHECK INTAKE DOOR OPERATION

1. Press REC (

) switch one time. REC indicator should illuminate.

2. Listen to the sound of the air coming out of the vent.
3. Press REC (

) switch one more time. REC indicator should go off.

4. There should be an audible change to the sound of the air flowing out of the vent. 
Is the test result normal?

YES

>> GO TO 8.

NO

>> Refer to 

HAC-165, "Diagnosis Procedure"

.

8.

CHECK TEMPERATURE DECREASE

1. Press A/C switch.

2. Rotate temperature control dial counterclockwise until maximum cold.

3. Check for cold air at selected discharge air outlets.
Is the test result normal?

YES

>> GO TO 9.

NO

>> Refer to 

HAC-182, "Component Function Check"

.

9.

CHECK TEMPERATURE INCREASE

1. Rotate temperature control dial clockwise until maximum hot.

2. Check for hot air at appropriate discharge air outlets.
Is the test result normal?

YES

>> Inspection End.

NO

>> Refer to 

HAC-184, "Component Function Check"

.

POWER SUPPLY AND GROUND CIRCUIT

HAC-159

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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DTC/CIRCUIT DIAGNOSIS

POWER SUPPLY AND GROUND CIRCUIT

A/C AUTO AMP.
A/C AUTO AMP. : Diagnosis Procedure

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Regarding Wiring Diagram information, refer to 

HAC-145, "Wiring Diagram"

 or 

HAC-152, "Wiring Diagram"

.

1.

CHECK FUSE

Check fuses [No. 5, 8 and 21, located in the fuse block (J/B)].

NOTE:

Refer to 

PG-47, "Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit.

2.

CHECK A/C AUTO AMP. POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector. 

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

CHECK A/C AUTO AMP. GROUND CIRCUIT

1. Turn ignition switch OFF.

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

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair harness or connector.

A/C SWITCH ASSEMBLY
A/C SWITCH ASSEMBLY : Component Function Check

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1.

CHECK OPERATION

1. Press the ON switch. 

2. Operate the temperature control switch. Check that the fan speed or outlet changes. 
Does it operate normally?

+

−

Voltage

A/C auto amp.

Ignition switch position

Connector

Terminal

OFF

ACC

ON

M33 (with manual A/C)

M29 (without A/C)

11

Ground

Approx. 0 V

Approx. 0 V

Battery voltage

12

Battery voltage

Battery voltage

Battery voltage

21

Approx. 0 V

Battery voltage

Battery voltage

A/C auto amp.

—

Continuity

Connector

Terminal

M33 (with manual A/C)

30

Ground

Yes

M29 (without A/C)