Nissan Pathfinder. Manual — part 716

A/C DISPLAY

HAC-125

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

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G

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A

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HAC

N

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A/C DISPLAY

Diagnosis Procedure

INFOID:0000000009176864

WITH BASE AUDIO SYSTEM

Regarding Wiring Diagram information, refer to

HAC-49, "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-

81, "DTC Logic"

or

HAC-82, "DTC Logic"

.

Is any DTC No. displayed?

YES

>> Perform diagnosis for the applicable DTC. Refer to

HAC-46, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK RX (A/C AUTO AMP.

→ A/C DISPLAY UNIT) CIRCUIT CONTINUITY

1. Disconnect the A/C switch assembly, A/C display unit and the A/C auto amp. connectors.

2. Check continuity between A/C display unit harness connector M148 terminal 10 and A/C auto amp. har-

ness connector M50 terminal 4.

3. Check continuity between A/C display unit harness connector M148 terminal 10 and ground.

Is the inspection result normal?

YES

>> Perform trouble diagnosis for the A/C display unit. Refer to

HAC-119, "A/C DISPLAY UNIT : Diag-

nosis Procedure"

.

NO

>> Repair harness or connector.

A/C display unit

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M148

10

M50

4

Yes

A/C display unit

—

Continuity

Connector

Terminal

M148

10

Ground

No

HAC-126

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

DOOR MOTOR

DOOR MOTOR

Diagnosis Procedure

INFOID:0000000009176865

Regarding Wiring Diagram information, refer to

HAC-49, "Wiring Diagram"

.

1.

CHECK EACH DOOR MOTOR POWER SUPPLY

1. Turn ignition switch ON.

2. Check voltage between intake door motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK EACH DOOR MOTOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect intake door motor connector.

3. Check continuity between intake door motor harness connector and ground.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair harness or connector.

3.

CHECK EACH DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN

1. Disconnect A/C auto amp. connector.

2. Check continuity between intake door motor 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 EACH DOOR MOTOR POWER SUPPLY CIRCUIT FOR SHORT

1. Disconnect following connectors.

-

Air mix door motor (driver side)

-

Air mix door motor (passenger side)

-

Mode door motor (front)

-

Rear shut-off door motor

-

Air mix door motor (rear)

-

Mode door motor (rear)

2. Check continuity between intake door motor harness connector and ground.

+

−

Voltage

(Approx.)

Intake door motor

Connector

Terminal

M128

1

Ground

Battery voltage

Intake door motor

—

Continuity

Connector

Terminal

M128

3

Ground

Yes

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M128

1

M50

17

Yes

DOOR MOTOR

HAC-127

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

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F

G

H

J

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A

B

HAC

N

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P

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

HAC-157, "Removal and Installation"

.

NO

>> Repair harness or connector.

Intake door motor

—

Continuity

Connector

Terminal

M128

1

Ground

No

HAC-128

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

DOOR MOTOR COMMUNICATION CIRCUIT

DOOR MOTOR COMMUNICATION CIRCUIT

Diagnosis Procedure

INFOID:0000000009176866

Regarding Wiring Diagram information, refer to

HAC-49, "Wiring Diagram"

.

NOTE:

If all of door motor DTCs are detected, check this circuit.

1.

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL

1. Turn ignition switch ON.

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

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector and intake door motor connector.

3. Check continuity between A/C auto amp. harness connector and intake door motor harness connector.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair harness or connector.

3.

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR SHORT

1. Disconnect following connectors.

-

Air mix door motor (driver side)

-

Air mix door motor (passenger side)

-

Mode door motor (front)

-

Rear shut-off door motor

-

Air mix door motor (rear)

-

Mode door motor (rear)

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

+

−

Output waveform

A/C auto amp.

Connector

Terminal

M50

16

Ground

SJIA1453J

A/C auto amp.

Intake door motor

Continuity

Connector

Terminal

Connector

Terminal

M50

16

M128

2

Yes

A/C auto amp.

—

Continuity

Connector

Terminal

M50

16

Ground

No