Nissan Pathfinder (2008 year). Manual - part 440

HAC-64

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector.

3.

Check continuity between A/C auto amp. harness connector
M50 (A) terminal 37 and rear air control (front) harness connec-
tor R2 (B) terminal 7.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-8, "Removal and

Installation"

.

NO

>> Repair harness or connector.

8.

CHECK REAR AIR CONTROL (FRONT) REFERENCE GROUND CIRCUIT FOR OPEN

1.

Disconnect A/C auto amp. connector.

2.

Check continuity between A/C auto amp. harness connector
M49 (A) terminal 3 and rear air control (front) harness connector
R2 (B) terminal 8.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-8, "Removal and

Installation"

.

NO

>> Repair harness or connector.

Rear Air Control (Rear) Diagnosis Procedure

INFOID:0000000001366726

DIAGNOSTIC PROCEDURE FOR REAR AIR CONTROL (REAR)

1.

CHECK REAR AIR CONTROL (REAR) AUX TEMPERATURE POT VOLTAGE

1.

Turn ignition switch OFF.

2.

Disconnect rear air control (rear).

3.

Turn ignition switch ON.

4.

Check voltage between rear air control (rear) harness connector
M208 terminal 7 and ground.

Is the inspection result normal? 

YES

>> GO TO 2.

NO

>> GO TO 5.

2.

CHECK REAR AIR CONTROL (REAR) REFERENCE VOLTAGE

Check voltage between rear air control (rear) harness connector
M208 terminal 3 and ground.

Is the inspection result normal? 

YES

>> GO TO 3.

NO

>> GO TO 6

3.

CHECK REAR AIR CONTROL (REAR) REFERENCE RETURN GROUND

Continuity should exist.

AWIIA0235ZZ

Continuity should exist.

AWIIA0261ZZ

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (rear): M208

7

Ground

4.5V

AWIIA0258ZZ

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (rear): M208

3

Ground

4.5V

AWIIA0257ZZ

REAR AIR CONTROL SYSTEM

HAC-65

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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1.

Turn ignition switch OFF.

2.

Check continuity between rear air control (rear) harness connec-
tor M208 terminal 8 and ground.

Is the inspection result normal? 

YES

>> GO TO 4.

NO

>> GO TO 7.

4.

CHECK REAR AIR CONTROL (REAR) GROUND CIRCUIT

1.

Check continuity between rear air control (rear) harness connec-
tor M208 terminal 1 and ground.

Is the inspection result normal? 

YES

>> Replace rear air control (rear). Refer to 

VTL-8,

"Removal and Installation"

.

NO

>> Repair harness or connector.

5.

CHECK REAR AUX TEMP CIRCUIT BETWEEN REAR AIR CONTROL (REAR) AND A/C AUTO AMP. FOR

OPEN

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector.

3.

Check continuity between rear air control (rear) harness connec-
tor M50 (A) terminal 51 and rear air control (rear) harness con-
nector M208 (B) terminal 7.

Is the inspection result normal? 

YES

>> Replace A/C auto amp. Refer to 

VTL-8, "Removal and

Installation"

.

NO

>> Repair harness or connector.

6.

CHECK REFERENCE VOLATAGE CIRCUIT BETWEEN REAR AIR CONTROL (REAR) AND A/C AUTO

AMP. FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector.

3.

Check continuity between rear air control (rear) harness connec-
tor M50 (A) terminal 28 and rear air control (rear) harness con-
nector M208 (B) terminal 3.

Is the inspection result normal? 

YES

>> Replace A/C auto amp. Refer to 

VTL-8, "Removal and

Installation"

.

NO

>> Repair harness or connector.

7.

CHECK REFERENCE RETURN GROUND CIRCUIT BETWEEN REAR AIR CONTROL (REAR) AND A/C

AUTO AMP. FOR OPEN

Continuity should exist.

AWIIA0259ZZ

Continuity should exist.

AWIIA0254ZZ

Continuity should exist.

AWIIA0235ZZ

Continuity should exist.

AWIIA0260ZZ

HAC-66

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector.

3.

Check continuity between rear air control (rear) harness connec-
tor M49 (A) terminal 3 and rear air control (rear) harness con-
nector M208 (B) terminal 8.

Is the inspection result normal? 

YES

>> Replace A/C auto amp. Refer to 

VTL-8, "Removal and

Installation"

.

NO

>> Repair harness or connector.

Continuity should exist.

AWIIA0261ZZ

MAGNET CLUTCH

HAC-67

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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MAGNET CLUTCH

System Description

INFOID:0000000001366727

SYSTEM DESCRIPTION

The A/C auto amp. controls compressor operation based on ambient and intake temperature and a signal
from ECM.

Low Temperature Protection Control

The A/C auto amp. 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 the preset value, the compressor turns ON. The compressor turns
OFF when intake air temperature is lower than the preset value. That preset value is dependent on the ambi-
ent temperature, refer to the following table.

Magnet Clutch Component Function Check

INFOID:0000000001366728

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1.

Turn ignition switch ON.

2.

Press the A/C switch.

3.

Press vent switch (

).

4.

Display shows 

, A/C. Confirm that the compressor clutch engages (sound or visual inspection). (Dis-

charge air and blower speed will depend on ambient, in-vehicle and set temperatures.)

Can the symptom be duplicated?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FOR ANY SYMPTOMS 

Perform a complete operational check for any symptoms. Refer to 

HAC-123, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to 

HAC-122, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"

. 

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

PERFORM SELF-DIAGNOSIS

Perform self-diagnosis to check for any codes. Refer to 

HAC-23, "A/C Auto Amp. Self-Diagnosis"

.

Are any self-diagnosis codes present?

YES

>> Refer to 

HAC-24, "A/C System Self-Diagnosis Code Chart"

.

Ambient temperature 

°

C 

(

°

F)

VK56DE Model

VQ40DE Model

Compressor ON             

intake temperature 

°

C 

(

°

F)

Compressor OFF             

intake temperature 

°

C 

(

°

F)

Compressor ON             

intake temperature 

°

C 

(

°

F)

Compressor OFF             

intake temperature 

°

C 

(

°

F)

0 (32)

6.0 (43)

5.5 (42)

5.5 (42)

5.0 (41)

10 (50)

5.0 (41)

5.0 (41)

4.5 (40)

4.5 (40)

20 (68)

3.5 (38)

3.0 (37)

3.0 (37)

2.5 (37)

30 (86)

3.0 (37)

2.5 (37)

2.5 (37)

1.5 (35)

40 (104)

3.0 (37)

2.5 (37)

2.0 (36)

1.0 (34)

50 (122)

3.0 (37)

2.5 (37)

2.0 (36)

1.0 (34)

HAC-68

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MAGNET CLUTCH

NO

>> GO TO 5.

5.

CHECK AMBIENT SENSOR 

Check and verify ambient sensor circuit. Refer to 

HAC-77, "Ambient Sensor Diagnosis Procedure"

.

>> GO TO 6.

6.

CHECK INTAKE SENSOR

Check and verify intake sensor circuit. Refer to 

HAC-157, "Intake Sensor Diagnosis Procedure"

.

>> GO TO 7.

7.

RECHECK FOR ANY SYMPTOMS 

Perform a complete operational check for any symptoms. Refer to 

HAC-123, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to 

HAC-122, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"

. 

NO

>> Replace A/C auto amp. Refer to 

VTL-8, "Removal and Installation"

.

Magnet Clutch Diagnosis Procedure

INFOID:0000000001366729

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

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

1.

CHECK INTAKE AND AMBIENT SENSOR CIRCUITS

Check intake and ambient sensors. Refer to 

HAC-23, "A/C Auto Amp. Self-Diagnosis"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> • Malfunctioning intake sensor. Refer to 

HAC-157, "Intake Sensor Diagnosis Procedure"

.

• Malfunctioning ambient sensor. Refer to 

HAC-77, "Ambient Sensor Diagnosis Procedure"

.

2.

PERFORM AUTO ACTIVE TEST

Refer to 

PCS-10, "Diagnosis Description"

.

Does magnet clutch operate?

AWIIA0198GB

MAGNET CLUTCH

HAC-69

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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YES

>> •

WITH CONSULT-III

GO TO 5.

•

WITHOUT CONSULT-III

GO TO 6.

NO

>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.

3.

CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R connector and compressor (magnet
clutch) connector.

3.

Check continuity between IPDM E/R harness connector E119
terminal 11 and A/C compressor harness connector F3 terminal
1.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK MAGNET CLUTCH CIRCUIT

Check for operation sound when applying battery voltage direct cur-
rent to terminal.
Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-30, "Removal and

Installation of IPDM E/R"

.

NO

>> Replace magnet clutch. Refer to 

HA-41, "Removal and

Installation for Compressor Clutch"

.

5.

CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

Check compressor ON/OFF signal. Refer to 

HAC-21, "CONSULT-III Function (HVAC)"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 6.

6.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector and A/C auto amp. connector.

3.

Check continuity between BCM harness connector M18 (A) ter-
minal 27 and A/C auto amp. harness connector M49 (B) terminal
4.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK VOLTAGE FOR A/C AUTO AMP. (A/C COMPRESSOR ON SIGNAL)

11 – 1

: Continuity should exist.

WJIA0560E

SJIA0197E

A/C SW ON

: COMP ON SIG ON

A/C SW OFF

: COMP ON SIG OFF

27 - 4

Continuity should exist.

AWIIA0199ZZ

HAC-70

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MAGNET CLUTCH

1.

Reconnect BCM connector and A/C auto amp. connector.

2.

Turn ignition switch ON.

3.

Check voltage between A/C auto amp. harness connector M49
terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO-1

>> If the voltage is approx. 5V when A/C switch is ON, replace A/C auto amp. Refer to 

VTL-8,

"Removal and Installation"

.

NO-2

>> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to 

PCS-41, "Removal

and Installation"

.

8.

CHECK REFRIGERANT PRESSURE SENSOR

1.

Start engine.

2.

Check voltage between ECM harness connector F54 terminal
70 and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Refer to 

EC-412, "Diagnosis Procedure"

.

9.

CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to 

HAC-21, "CONSULT-III Function (HVAC)"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 10.

10.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.

Terminals

Condition

Voltage

(+)

(-)

A/C auto 

amp. con-

nector

Terminal No.

M49

4

Ground

A/C switch: ON

Approx. 0V

A/C switch: OFF

Approx. 5V

AWIIA0200ZZ

Terminals

Condition

Voltage

(+)

(-)

ECM con-

nector

Terminal No.

F54

70

Ground

A/C switch: ON

Approx. 0.36 - 3.88V

LJIA0124E

FRONT BLOWER CONTROL 
DIAL ON

: FAN ON SIG ON

FRONT BLOWER CONTROL 
DIAL OFF

: FAN ON SIG OFF

MAGNET CLUTCH

HAC-71

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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1.

Turn ignition switch OFF.

2.

Disconnect BCM connector and A/C auto amp. connector.

3.

Check continuity between BCM harness connector M18 (A) ter-
minal 28 and A/C auto amp. harness connector M49 terminal 5.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Repair harness or connector.

11.

CHECK VOLTAGE FOR A/C AUTO AMP. (FAN ON SIGNAL)

1.

Reconnect BCM connector and A/C auto amp. connector.

2.

Turn ignition switch ON.

3.

Check voltage between A/C auto amp. harness connector M49
terminal 5 and ground.

Is the inspection result normal?

YES

>> GO TO 12.

NO-1

>> If the voltage is approx. 5V when blower motor is ON, replace A/C auto amp. Refer to 

VTL-8,

"Removal and Installation"

.

NO-2

>> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to 

PCS-41, "Removal

and Installation"

.

12.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to 

LAN-14, "Trouble Diagnosis Flow Chart"

.

• BCM  –  ECM
• ECM – IPDM E/R
• ECM – A/C auto amp.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair or replace malfunctioning part(s).

28 - 5

Continuity should exist.

AWIIA0201ZZ

Terminals

Condition

Voltage

(+)

(-)

A/C auto amp. 

connector

Terminal No.

M49

5

Ground

A/C switch: ON
Blower motor 
operates

Approx. 0V

A/C switch: OFF

Approx. 5V

AWIIA0202ZZ