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
.
>> GO TO 3.
3.
GO TO APPROPRIATE TROUBLE DIAGNOSIS
Go to appropriate trouble diagnosis. Refer to
.
>> 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
.
Is the test result normal?
YES
>> GO TO 6.
NO
>> Refer to
.
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
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
1.
CHECK FUSE
Check fuses [No. 5, 8 and 21, located in the fuse block (J/B)].
NOTE:
.
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)
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