Nissan Pathfinder (2012 year). Manual - part 429

HAC-154

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

BLOWER MOTOR

Front Blower Motor Diagnosis Procedure

INFOID:0000000007356436

Regarding Wiring Diagram information, refer to 

HAC-172, "Wiring Diagram - Manual"

.

SYMPTOM: Blower motor operation is malfunctioning under starting

blower speed control.

1.

DIAGNOSTIC PROCEDURE

1. Turn ignition switch ON.

2. Turn the front blower switch to each of its four speeds.

Does blower motor rotate normally at each speed?

YES or NO

YES

>> Inspection End.

NO

>> 1. Does not rotate at any speed, GO TO 2.

2. Does not rotate at 1 - 3 speed, GO TO 13.

3. Does not rotate at 4 speed, GO TO 16.

2.

CHECK FUSES

1. Check 15A fuses (Nos. 24 and 27, located in the fuse and fusible link box). Refer to 

PG-73, "Terminal

Arrangement"

.

2. Check 10A fuse [No. 8, located in the fuse block (JB)]. Refer to 

PG-72, "Terminal Arrangement"

.

Is inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 8.

3.

CHECK FRONT BLOWER MOTOR POWER SUPPLY

WJIA1503E

August 2012

2012 Pathfinder

BLOWER MOTOR

HAC-155

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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1. Turn ignition switch OFF.

2. Disconnect front blower motor harness connector.

3. Turn ignition switch ON.

4. Select any front blower speed except OFF.

5. Check voltage between front blower motor harness connector

M62 terminal 2 and ground.

Is inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 4.

4.

CHECK FRONT BLOWER MOTOR RELAY

1. Turn Ignition switch OFF.

2. Check front blower motor relay. Refer to 

HAC-157, "Front Blower Motor Component Inspection"

.

Is inspection result normal?

YES

>> GO TO 5.

NO

>> Replace front blower motor relay.

5.

CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (SWITCH SIDE)

Check voltage between front blower motor relay harness connector

E54 terminals 7 and 5 and ground.

Is inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (COIL SIDE)

1. Turn ignition switch ON.

2. Check voltage between front blower motor relay harness con-

nector E54 terminal 1 and ground.

Is inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace harness as necessary.

7.

CHECK FRONT BLOWER MOTOR POWER FROM RELAY TO FRONT BLOWER MOTOR

2 - Ground

: Battery voltage

WJIA1331E

A

Condition

Voltage (Ap-

prox.)

(+)

Front air control 

connector

Terminal 

(-)

M54

5 Ground

Blower motor 

relay power 

supply

Battery voltage

M54

7 Ground

Blower motor 

relay power 

supply

Battery voltage

WJIA1634E

A

Condition

Voltage (Ap-

prox.)

(+)

Front air control 

connector

Terminal 

(-)

M54

1 Ground

Blower motor 

relay power 

supply (coil 

side)

Battery voltage

WJIA0504E

August 2012

2012 Pathfinder

HAC-156

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

BLOWER MOTOR

1. Turn ignition switch OFF.

2. Check continuity between front blower motor relay harness con-

nector E54 terminals 6 and 3 and front blower motor harness

connector M62 terminal 2.

Is inspection result normal?

YES

>> Repair open front blower motor relay ground circuit.

NO

>> Repair harness or connector between the front blower

motor relay and the front blower motor.

8.

REPLACE FUSE

Refer to 

PG-74, "Terminal Arrangement"

.

Does fuse No. 24 or 27 open when the front blower motor is turned on?
YES or NO

YES

>> GO TO 10.

NO

>> GO TO 9.

9.

REPLACE FUSE

Refer to 

PG-74, "Terminal Arrangement"

.

Does fuse No. 8 open when the ignition switch is turned ON?
YES or NO

YES

>> Repair or replace harness as necessary.

NO

>> Inspection End.

10.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

1. Turn ignition switch OFF.

2. Disconnect front blower motor connector.

3. Check continuity between front blower motor harness connector

M62 terminal 2 and ground.

Is inspection result normal?

YES

>> GO TO 11.

NO

>> Repair or replace harness as necessary.

11.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT FOR SHORT

1. Disconnect front blower motor relay connector.

2. Check continuity between the front blower motor relay harness

connector E54 terminal 7 and terminal 5 and ground.

Is inspection result normal?

YES

>> Check front blower motor. Refer to 

HAC-154, "Front

Blower Motor Diagnosis Procedure"

.

NO

>> Repair harness or connector.

12.

CHECK FRONT BLOWER MOTOR

1. Turn ignition switch OFF.

2. Check front blower motor. Refer to 

HAC-157, "Front Blower Motor Component Inspection"

.

Is inspection result normal?

3, 6 - 2

: Continuity should exist.

WJIA1333E

2 - Ground

: Continuity should not exist.

WJIA0649E

7, 5 - Ground

: Continuity should not exist.

WJIA1334E

August 2012

2012 Pathfinder

BLOWER MOTOR

HAC-157

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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YES

>> GO TO 13.

NO

>> Replace front blower motor. Refer to 

PG-74, "Terminal Arrangement"

.

13.

CHECK FRONT BLOWER MOTOR RESISTOR

Check front blower motor resistor. Refer to 

HAC-157, "Front Blower Motor Component Inspection"

.

Is inspection result normal?

YES

>> GO TO 14.

NO

>> Replace front blower motor resistor. Refer to 

VTL-16, "Removal and Installation"

.

14.

CHECK FRONT BLOWER SWITCH

Check front blower switch. Refer to 

HAC-157, "Front Blower Motor Component Inspection"

.

Is inspection result normal?

YES

>> GO TO 15.

NO

>> Replace front blower switch. Refer to 

VTL-7, "Removal and Installation"

.

15.

CHECK FRONT BLOWER MOTOR GROUND CIRCUIT TO FRONT BLOWER MOTOR RESISTOR

1. Disconnect front blower motor resistor harness connector.

2. Check continuity between front blower motor connector M62 (A)

terminal 1 and front blower motor resistor harness connector

M121 (B) terminal 3.

Is inspection result normal?

YES

>> Repair harness or connector between front blower

switch connector M51 terminal 8 and ground.

NO

>> Repair harness or connector between front blower motor resistor and front blower motor.

16.

CHECK FRONT BLOWER SWITCH

Check front blower switch. Refer to 

HAC-157, "Front Blower Motor Component Inspection"

.

Is inspection result normal?

YES

>> Repair harness or connector between front blower motor switch connector M51 terminal 8 and

front blower motor resistor connector M121 terminal 3.

NO

>> Replace front blower switch. Refer to 

VTL-7, "Removal and Installation"

.

Front Blower Motor Component Inspection

INFOID:0000000007356437

COMPONENT INSPECTION

Front Blower Motor Relay

A

B

Connector

Terminal Connector

Terminal 

Continuity

Front blower motor: 

M62

1 

Front blower mo-

tor resistor: M121

3

Yes

WJIA1676E

August 2012

2012 Pathfinder

HAC-158

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

BLOWER MOTOR

Check continuity between terminals by supplying 12 volts and

ground to coil side terminals of relay.

Front Blower Motor

Confirm smooth rotation of the blower motor.

• Ensure that there are no foreign particles inside the blower unit.

• Apply 12 volts to terminal 2 and ground to terminal 1 and verify that

the motor operates freely and quietly.

Front Blower Switch

Check continuity between the terminals at each front blower switch

position.

Blower Motor Resistor

LJIA0068E

WJIA1508E

WJIA0508E

August 2012

2012 Pathfinder

BLOWER MOTOR

HAC-159

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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Check continuity between terminals. There will be resistance, but

there should not be an open or short between any two terminals.

WJIA0971E

August 2012

2012 Pathfinder

HAC-160

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MAGNET CLUTCH

MAGNET CLUTCH

System Description

INFOID:0000000007356438

SYSTEM DESCRIPTION

The front air control controls compressor operation based on ambient and intake temperature and a signal

from ECM.

Low Temperature Protection Control

The front air control will turn the compressor ON or OFF as determined by a signal detected by the intake sen-

sor and the ambient sensor.

When intake air temperature is higher than 3.5

°

 C (38.3

°

 F), the compressor turns ON. The compressor turns

OFF when intake air temperature is lower than 2.5

°

 C (36.5

°

 F).

Magnet Clutch Component Function Check

INFOID:0000000007356439

SYMPTOM: Magnet clutch does not engage.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1. Rotate blower control dial clockwise. 
2. Rotate mode dial to vent (

) position.

3. Press A/C switch. Confirm that the compressor clutch engages (sound or visual inspection). 
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-160, "Magnet Clutch Diagnosis Procedure"

.

Magnet Clutch Diagnosis Procedure

INFOID:0000000007356440

Regarding Wiring Diagram information, refer to 

HAC-172, "Wiring Diagram - Manual"

.

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

1.

PERFORM AUTO ACTIVE TEST

Refer to 

PCS-11, "CONSULT Function (IPDM E/R)"

.

Does magnet clutch operate?
YES or NO

YES

>> •

WITH CONSULT

GO TO 2.

WJIA1490E

August 2012

2012 Pathfinder

MAGNET CLUTCH

HAC-161

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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•

WITHOUT CONSULT

GO TO 8.

NO

>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 12.

2.

CHECK BCM INPUT (A/C COMPRESSOR ON) SIGNAL

Check A/C compressor ON/OFF signal. Refer to 

BCS-23, "AIR CONDITIONER : CONSULT Function (BCM -

AIR CONDITIONER)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 8.

3.

CHECK REFRIGERANT PRESSURE SENSOR

Check refrigerant pressure sensor. Refer to 

EC-133, "Diagnosis Procedure"

 (VQ40DE) or 

EC-661, "Diagnosis

Procedure"

 (VK56DE). 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace refrigerant pressure sensor. Refer to 

HA-54, "Removal and Installation for Refrigerant

Pressure Sensor"

.

4.

CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to 

BCS-23, "AIR CONDITIONER : CONSULT Function (BCM - AIR CONDI-

TIONER)"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 5.

5.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Disconnect BCM connector and front air control connector.

3. Check continuity between BCM harness connector M18 (A) ter-

minal 28 and front air control harness connector M52 (B) termi-

nal 18.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)

A/C SW ON

:AIR COND SW ON

A/C SW OFF

:AIR COND SW OFF

BLOWER CONTROL DIAL 
ON

: FAN ON SIG ON

BLOWER CONTROL DIAL 
OFF

: FAN ON SIG OFF

A

B

Connector

Terminal Connector

Terminal 

Continuity

BCM: M18

28 

Front air control: 

M52

18

Yes

WJIA1627E

August 2012

2012 Pathfinder