Nissan Pathfinder (2009 year). Manual - part 458

BLOWER MOTOR CONTROL SYSTEM

HAC-59

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

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A

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HAC

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NO

>> Inspection End.

15.

CHECK REAR BLOWER MOTOR

Check rear blower motor. Refer to 

HAC-60, "Rear Blower Motor And Relay Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Replace rear blower motor. Refer to 

VTL-12, "Removal and Installation"

.

16.

CHECK REAR BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

1.

Turn ignition switch OFF.

2.

Disconnect fuse block (J/B) M3 harness connector and variable
blower control (rear).

3.

Check continuity between rear blower motor harness connector
B501 terminal 2 and ground.

Is the inspection result normal?

YES

>> Replace variable blower control (rear). Refer to 

VTL-14,

"Removal and Installation"

.

NO

>> Repair harness or connector.

17.

CHECK REAR AIR CONTROL (FRONT) POWER SUPPLY

Check voltage between rear air control (front) harness connector R2
terminal 10 and ground.

Is the inspection result normal?

YES

>> GO TO 18.

NO

>> Repair harness or connector.

18.

CHECK A/C AUTO AMP. FRONT AUX BLOWER POT CIRCUIT FOR SHORT

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. harness connector M50.

3.

Check continuity between rear air control (front) harness con-
nector R2 terminal 6 and ground.

Is the inspection result normal?

YES

>> Replace rear air control (front) Refer to 

VTL-7,

"Removal and Installation"

.

NO

>> Repair harness or connector.

Rear Air Control (Rear) Diagnosis Procedure #4

INFOID:0000000003935906

TROUBLE DIAGNOSIS PROCEDURE

1.

CHECK REAR AIR CONTROL (REAR) REAR AUX BLOWER POT REFERENCE VOLTAGE

1.

Turn ignition switch OFF.

Continuity should not exist.

AWIIA0251ZZ

Battery voltage should exist.

AWIIA0253ZZ

Continuity should not exist.

AWIIA0913ZZ

2009 Pathfinder

HAC-60

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

2.

Disconnect rear air control (rear) harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between rear air control (rear) harness connector
M208 terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK REAR AIR CONTROL (REAR) GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

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-7,

"Removal and Installation"

.

NO

>> Repair harness or connector.

3.

CHECK REAR AIR CONTROL (REAR) REAR AUX BLOWER POT FOR SHORT

1.

Turn ignition switch OFF.

2.

Check continuity between rear air control (rear) harness connec-
tor M208 terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK REAR AIR CONTROL (REAR) REAR AUX BLOWER POT BETWEEN A/C AUTO AMP. AND REAR

AIR CONTROL REAR

1.

Disconnect A/C auto amp. harness connector.

2.

Check continuity between A/C auto amp. harness connector
M50 (A) terminal 52 and rear air control (rear) harness connec-
tor M208 (B) terminal 6.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair harness or connector.

Rear Blower Motor And Relay Component Inspection

INFOID:0000000003935907

COMPONENT INSPECTION

Rear Blower Motor Relay

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (rear): M208

6 

Ground

5V

AWIIA0252ZZ

Continuity should exist.

AWIIA0254ZZ

Continuity should not exist.

AWIIA0913ZZ

Continuity should exist.

AWIIA0256ZZ

2009 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-61

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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HAC

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Check circuit continuity between terminals by supplying 12 volts and
ground to coil side terminals of relays.

Rear Blower Motor

Check that there are no foreign particles inside the intake unit.
Apply 12 volts to terminal 2 and ground to terminal 1 and ensure that
the blower motor rotates freely and quietly.

WJIA0973E

LJIA0115E

2009 Pathfinder

HAC-62

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

REAR AIR CONTROL SYSTEM

Rear Air Control System Description

INFOID:0000000003935908

SYSTEM DESCRIPTION

Component Parts

Rear air control system components are:
• A/C auto amp.
• Rear air control (front)
• Rear air control (rear)
• Air mix door motor (rear)

System Operation

Rear Air Control

When the REAR CTRL indicator is off the rear air control (front) will control all rear blower motor speeds and
the rear temperature/mode operations. When the REAR CTRL switch is pressed (indicator on), the rear air
control (rear) will control all the rear blower motor speeds and the rear temperature/mode operations.

Rear Air Control Component Function Check

INFOID:0000000003935909

SYMPTOM:
• Temperature cannot be adjusted from the rear air control.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING REAR AIR CONTROL (FRONT) OPERATIONAL CHECK 

1.

Press AUTO switch (rear air controls only operate when front blower is on).

2.

Turn the rear blower motor to maximum speed from the rear air control (front).

3.

Turn rear air control (front) temperature/mode control dial clockwise and then counterclockwise (REAR
CTRL indicator off).

4.

Check for hot air at rear floor discharge air outlets in the maximum heat position and cold air at rear roof
discharge air outlets in the maximum cold position.

 Does the rear air control (front) operate properly?

YES

>> GO TO 2.

NO

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

HAC-63, "Rear Air Control (Front) Diagnosis Procedure"

.

2.

CONFIRM SYMPTOM BY PERFORMING REAR AIR CONTROL (REAR) OPERATIONAL CHECK

1.

Press the REAR CTRL switch on rear air control (front) to send control to the rear air control (rear).

2.

Turn the rear blower motor to maximum speed from the rear air control (rear).

3.

Turn rear air control (rear) temperature/mode control dial slowly clockwise and then counterclockwise
(REAR CTRL indicator on).

WJIA2102E

2009 Pathfinder

REAR AIR CONTROL SYSTEM

HAC-63

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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4.

Check for hot air at rear floor discharge air outlets in the maximum heat position and cold air at rear roof
discharge air outlets in the maximum cold position.

 Does the rear air control (rear) operate properly?

YES

>> GO TO 3.

NO

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

HAC-65, "Rear Air Control (Rear) Diagnosis Procedure"

.

3.

CHECK FOR ANY SYMPTOMS 

Perform a complete operational check (rear) for any symptoms.

Does another symptom exist?

YES

>> Refer to 

HAC-4, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"

. 

NO

>> System OK.

4.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 5.

5.

CONFIRM SYMPTOM BY PERFORMING REAR AIR CONTROL (REAR) OPERATIONAL CHECK

Perform rear air control operation diagnosis to check for any codes. Refer to 

HAC-6, "Operational Check

(Rear)"

. 

Are any symptoms present?

YES

>> Refer to 

HAC-108, "Symptom Matrix Chart"

.

NO

>> System OK.

Rear Air Control (Front) Diagnosis Procedure

INFOID:0000000003935910

DIAGNOSTIC PROCEDURE FOR REAR AIR CONTROL (FRONT)

SYMPTOM: 

• Temperature/mode operation is malfunctioning.

1.

CHECK REAR AIR CONTROL (FRONT) POWER SUPPLY

1.

Disconnect rear air control (front) harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between rear air control (front) harness connec-
tor R2 terminal 10 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK REAR AIR CONTROL (FRONT) REFERENCE VOLTAGE

Check voltage between rear air control (front) harness connector R2
terminal 3 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 6.

3.

CHECK REAR AIR CONTROL (FRONT) AUX TEMP POT VOLTAGE

Battery voltage should exist.

AWIIA0253ZZ

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (front): R2

3

Ground

4.5V

AWIIA0257ZZ

2009 Pathfinder

HAC-64

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

Check voltage between rear air control (front) harness connector R2
terminal 7 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 7.

4.

CHECK REAR AIR CONTROL (FRONT) GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between rear air control (front) harness con-
nector R2 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

5.

CHECK REAR AIR CONTROL (FRONT) REFERENCE GROUND CIRCUIT

Check continuity between rear air control (front) harness connector
R2 terminal 8 and ground.

Is the inspection result normal?

YES

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

VTL-7,

"Removal and Installation"

. 

NO

>> GO TO 8.

6.

CHECK REAR AIR CONTROL (FRONT) REFERENCE VOLTAGE CIRCUIT

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 28 and rear air control (front) harness connec-
tor R2 (B) 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.

7.

CHECK REAR AIR CONTROL (FRONT) AUX TEMP POT CIRCUIT

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (front): R2

7

Ground

4.5V

AWIIA0258ZZ

Continuity should exist.

AWIIA0254ZZ

Continuity should exist.

AWIIA0259ZZ

Continuity should exist.

AWIIA0260ZZ

2009 Pathfinder

REAR AIR CONTROL SYSTEM

HAC-65

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

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F

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M

A

B

HAC

N

O

P

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-7, "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-7, "Removal and

Installation"

.

NO

>> Repair harness or connector.

Rear Air Control (Rear) Diagnosis Procedure

INFOID:0000000003935911

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

2009 Pathfinder

HAC-66

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

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-7,

"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-7, "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-7, "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

2009 Pathfinder