Nissan Pathfinder (2010 year). Manual - part 459

HAC-148

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

BLOWER MOTOR

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-150, "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

2010 Pathfinder

BLOWER MOTOR

HAC-149

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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A

B

HAC

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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-75, "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-75, "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-147, "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-150, "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

2010 Pathfinder

HAC-150

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

BLOWER MOTOR

YES

>> GO TO 13.

NO

>> Replace front blower motor. Refer to 

PG-75, "Terminal Arrangement"

.

13.

CHECK FRONT BLOWER MOTOR RESISTOR

Check front blower motor resistor. Refer to 

HAC-150, "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-150, "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-150, "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:0000000005257001

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

2010 Pathfinder

BLOWER MOTOR

HAC-151

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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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

2010 Pathfinder

HAC-152

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

BLOWER MOTOR

Check continuity between terminals. There will be resistance, but

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

WJIA0971E

2010 Pathfinder

MAGNET CLUTCH

HAC-153

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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MAGNET CLUTCH

System Description

INFOID:0000000005257002

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:0000000005257003

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). 
Can the symptom be duplicated?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-153, "Magnet Clutch Diagnosis Procedure"

.

Magnet Clutch Diagnosis Procedure

INFOID:0000000005257004

Regarding Wiring Diagram information, refer to 

HAC-165, "Wiring Diagram"

.

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-14, "CONSULT - III Function (IPDM E/R)"

.

Does magnet clutch operate?
YES or NO

YES

>> •

WITH CONSULT-III

GO TO 2.

WJIA1490E

2010 Pathfinder

HAC-154

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MAGNET CLUTCH

•

WITHOUT CONSULT-III

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 

HAC-134, "CONSULT-III Function (BCM - COMMON ITEM)"

.

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-134, "Diagnosis Procedure"

 (VQ40DE) or 

EC-615, "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 

HAC-134, "CONSULT-III Function (BCM - COMMON ITEM)"

.

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

: COMP ON SIG ON

A/C SW OFF

: COMP ON SIG 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

2010 Pathfinder

MAGNET CLUTCH

HAC-155

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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1. Reconnect BCM connector and front air control connector.

2. Turn ignition switch ON.

3. Turn A/C switch ON.

4. Check voltage between front air control harness connector M52

terminal 18 and ground.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-59, "Removal and Installation"

.

NO-1 >> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to 

VTL-7,

"Removal and Installation"

.

NO-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to 

BCS-59, "Removal

and Installation"

.

7.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to 

LAN-14, "Trouble Diagnosis Flow Chart"

.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair or replace malfunctioning part(s).

8.

CHECK VOLTAGE FOR FRONT AIR CONTROL (A/C COMPRESSOR ON SIGNAL)

1. Reconnect BCM connector and front air control connector.

2. Turn ignition switch ON.

3. Check voltage between front air control harness connector M52

terminal 10 and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO-1 >> If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to 

VTL-7,

"Removal and Installation"

.

NO-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to 

BCS-59, "Removal

and Installation"

.

9.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

Terminals

Condition

Voltage

(Approx.)

(+)

(-)

Front air con-

trol connector

Terminal 

No.

M52

18

Ground

A/C switch: ON
Blower motor 
operates

0V

A/C switch: OFF

Battery voltage

WJIA1628E

Terminals

Condition

Voltage

(Approx.)

(+)

(-)

Front air 

control con-

nector

Terminal No.

M52

10

Ground

A/C switch: ON

Approx. 0V

A/C switch: 

OFF

Approx. 5V

WJIA1137E

2010 Pathfinder