Nissan Pathfinder (2011 year). Manual - part 450

REAR AIR CONTROL SYSTEM

HAC-63

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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5.

CHECK REAR AIR CONTROL (FRONT) REAR CONTROL SELECT SWITCH SIGNAL

While pressing and holding the rear air control (front) rear control select switch, check voltage between rear air

control (front) harness connector R2 terminal 5 and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 6.

6.

CHECK REAR AIR CONTROL (FRONT) REAR CONTROL SELECT SWITCH SIGNAL

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp connector (M50).

3. Turn ignition switch ON.

4. While pressing and holding the rear air control (front) rear control select switch, check voltage between

rear air control (front) harness connector R2 terminal 5 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> GO TO 7.

7.

CHECK REAR AIR CONTROL (FRONT) REAR CONTROL SELECT SWITCH CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect rear air control (front) connector.

3. Check continuity between A/C auto amp. harness connector M50 terminal 39 and rear air control (front)

harness connector R2 terminal 5.

4. Check continuity between A/C auto amp. harness connector M50 terminal 39 ground.

Is the inspection result normal?

YES

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

VTL-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

8.

CHECK REAR AIR CONTROL (FRONT) REAR CONTROL SELECT SWITCH SIGNAL

While pressing and holding the rear air control (front) rear control select switch, check voltage between A/C

auto amp. harness connector M50 terminal 39 and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair harness or connector.

9.

CHECK REAR AIR CONTROL (FRONT) REAR CONTROL TELLTALE SIGNAL

Repeatedly press and release the rear air control (front) rear control select switch and check voltage between

A/C auto amp. harness connector M50 terminal 35 and ground.

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (front): R2

5

Ground

6.5V

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (front): R2

5

Ground

6.5V

Continuity should exist.

Continuity should not exist.

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

A/C auto amp.: M50

39

Ground

6.5V

2011 Pathfinder

HAC-64

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

Is the inspection result normal?

YES

>> Repair harness or connector.

NO

>> GO TO 10.

10.

CHECK REAR AIR CONTROL (FRONT) REAR CONTROL TELLTALE CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp connector M50 and rear air control (front) connector R2.

3. Check continuity between A/C auto amp. harness connector M50 terminal 35 and rear air control (front)

harness connector R2 terminal 4.

4. Check continuity between A/C auto amp. harness connector M50 terminal 35 and ground.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Repair harness or connector.

11.

CHECK REAR AIR CONTROL (FRONT) REAR CONTROL TELLTALE CIRCUIT

1. Reconnect rear air control (front) connector.

2. Check continuity between rear air control (front) connector R2 terminal 4 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

NO

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

VTL-7, "Removal and Installation"

.

12.

CHECK REAR AIR CONTROL (REAR) GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between rear air control (rear) harness connector M208 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair harness or connector.

13.

CHECK REAR AIR CONTROL (REAR) REFERENCE VOLTAGE

1. Turn ignition switch ON.

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

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> GO TO 14.

14.

CHECK REAR AIR CONTROL (REAR) REFERENCE VOLTAGE CIRCUIT

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

A/C auto amp.: M50

35

Ground

Switching be-
tween battery 

voltage and 

7.5V

Continuity should exist.

Continuity should not exist.

Continuity should not exist.

Continuity should exist.

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (rear): M208

3

Ground

4.5V

2011 Pathfinder

REAR AIR CONTROL SYSTEM

HAC-65

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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1. Disconnect A/C auto amp. connector.

2. Check continuity between A/C auto amp. harness connector M50 terminal 28 and rear air control (rear)

harness connector M208 terminal 3.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

15.

CHECK REAR AIR CONTROL (REAR) REFERENCE GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between rear air control (rear) harness connector M208 terminal 8 and ground.

Is the inspection result normal?

YES

>> GO TO 17

NO

>> GO TO 18.

16.

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

1. Disconnect A/C auto amp. connector and rear air control (rear) harness connector.

2. Check continuity between A/C auto amp. harness connector M49 terminal 3 and rear air control (rear) har-

ness connector M208 terminal 8.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

17.

CHECK REAR AIR CONTROL (REAR) AUX TEMP POT VOLTAGE

1. Turn ignition ON.

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

ing knob between full cold and full hot.

Is the inspection result normal?

YES

>> GO TO 19.

NO

>> GO TO 18.

18.

CHECK REAR AIR CONTROL (REAR) AUX TEMP POT CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector and rear air control (rear) connector.

3. Check continuity between A/C auto amp. harness connector M50 terminal 51 and rear air control (rear)

harness connector M208 terminal 7.

4. Check continuity between A/C auto amp. harness connector M50 terminal 51 and ground.

Is the inspection result normal?

YES

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

VTL-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

Continuity should exist.

Continuity should exist.

Continuity should exist.

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (rear): M208

7

Ground

Varying be-

tween 0.1V and 

4.9V

Continuity should exist.

Continuity should not exist.

2011 Pathfinder

HAC-66

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

19.

CHECK REAR AIR CONTROL (REAR) AUX TEMP POT VOLTAGE

Check voltage between A/C auto amp. harness connector M50 terminal 51 and ground while turning knob

between full cold and full hot.

Is the inspection result normal?

YES

>> GO TO 21.

NO

>> GO TO 20.

20.

CHECK REAR AIR CONTROL (REAR) AUX TEMP POT CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector and rear air control (rear) connector.

3. Check continuity between A/C auto amp. harness connector M50 terminal 51 and rear air control (rear)

harness connector M208 terminal 7.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

21.

CHECK AIR MIX DOOR MOTOR (REAR) CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connector M50 and the air mix door motor (rear) harness connec-

tor B155.

3. Check continuity between A/C auto amp. harness connector M50 terminals 43, 44 and the air mix door

motor (rear) harness connector B155 terminal 1, 6.

4. Check continuity between A/C auto amp. harness connector M50 terminals 43, 44 and ground.

Is the inspection result normal?

YES

>> GO TO 22.

NO

>> Repair or replace harness as necessary.

22.

CHECK A/C AUTO AMP. FOR AIR MIX DOOR MOTOR (REAR) POWER AND GROUND 

1. Reconnect A/C auto amp. harness connector.

2. Turn ignition switch ON.

3. Rotate temperature control dial (rear) to maximum hot.

4. Check voltage between A/C auto amp. harness connector M50 terminal 43 and terminal 44 while rotating

temperature control dial (rear) to maximum cold and back to maximum heat.

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

A/C auto amp.: M50

51

Ground

Varying be-

tween 0.1V and 

4.9V

Continuity should exist.

Connector

Terminal

Connector

Terminal

Continuity

M50

43

B155

1

Yes

44

6

Connector

Terminal

—

Continuity

M50

43

Ground

No

44

2011 Pathfinder

REAR AIR CONTROL SYSTEM

HAC-67

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Is the inspection result normal?

YES

>> GO TO 23.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

23.

CHECK AIR MIX DOOR MOTOR (REAR) PBR CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connectors M49 and M50.

3. Check continuity between A/C auto amp. harness connector M49 terminal 3 and M50 terminal 28 and air

mix door motor (rear) harness connector B155 terminal 2, 3.

4. Check continuity between A/C auto amp. harness connector M49 terminal 3, M50 terminal 28 and ground.

Is the inspection result normal?

YES

>> GO TO 24.

NO

>> Repair or replace harness as necessary.

24.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND 

1. Check continuity between A/C auto amp. harness connector M50 terminal 30 and air mix door motor

(rear) harness connector B155 terminal 4.

2. Check continuity between A/C auto amp. harness connector M50 terminal 30 and ground.

Is the inspection result normal?

YES

>> GO TO 25.

NO

>> Repair or replace harness as necessary.

25.

CHECK A/C AUTO AMP. FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIG-

NAL 

1. Reconnect A/C auto amp. harness connectors.

2. Turn ignition switch ON.

3. Check voltage between A/C auto amp. harness connector M49 terminal 3, and M50 terminal 28.

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M50

43

44

Rotate rear temperature control dial 

(rear) to maximum cold

Battery voltage

44

43

Rotate rear temperature control dial 

(rear) to maximum heat

Battery voltage

Connector

Terminal

Connector

Terminal

Continuity

M49

3

B155

2

Yes

M50

28

3

Connector

Terminal

—

Continuity

M49

3

Ground

No

M50

28

Connector

Terminal

Connector

Terminal

Continuity

M50

30

B155

4

Yes

Connector

Terminal

—

Continuity

M50

30

Ground

No

2011 Pathfinder

HAC-68

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

4. Check voltage between A/C auto amp. harness connector M50 terminal 30 and ground.

Is the inspection result normal?

YES

>> GO TO 26.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

26.

CHECK A/C AUTO AMP. FOR FEEDBACK SIGNAL 

1. Reconnect the air mix door motor (rear) harness connector B155.

2. Check voltage between A/C auto amp. harness connector M50 terminal 30 and ground.

Is the inspection result normal?

YES

>> Inspect air mix door (rear) for binding or mechanical failure. If air mix door (rear) moves freely,

replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Replace the air mix door motor (rear). Refer to 

VTL-29, "Removal and Installation"

.

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-) 

M50

28

M49

3

5V

Connector

Terminal

—

Voltage (Approx.)

M50

30

Ground

0V

Connector

Terminal

—

Voltage (Approx.)

M50

30

Ground

0.1 to 4.9V

2011 Pathfinder

MAGNET CLUTCH

HAC-69

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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MAGNET CLUTCH

System Description

INFOID:0000000006243658

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:0000000006243659

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.)

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-69, "Magnet Clutch Diagnosis Procedure"

.

Magnet Clutch Diagnosis Procedure

INFOID:0000000006243660

Regarding Wiring Diagram information, refer to 

HAC-95, "Wiring Diagram - Automatic"

.

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

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)

2011 Pathfinder

HAC-70

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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-24, "A/C Auto Amp. Self-Diagnosis"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> • Malfunctioning intake sensor. Refer to 

HAC-87, "Intake Sensor Diagnosis Procedure"

.

• Malfunctioning ambient sensor. Refer to 

HAC-79, "Ambient Sensor Diagnosis Procedure"

.

2.

PERFORM AUTO ACTIVE TEST

Refer to 

PCS-9, "Diagnosis Description"

.

Does magnet clutch operate?

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.

4. Check continuity between IPDM E/R harness connector E119 terminal 11 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK MAGNET CLUTCH CIRCUIT

AWIIA0198GB

11 – 1

: Continuity should exist.

11 – 1

: Continuity should not exist.

2011 Pathfinder