Nissan Pathfinder (2009 year). Manual - part 457

BLOWER MOTOR CONTROL SYSTEM

HAC-51

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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1.

Disconnect variable blower control (front) connector.

2.

Check continuity between front blower motor harness connector
M62 (B) terminal 1 and variable blower control harness connec-
tor M122 (A) terminal 2.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair harness or connector.

13.

CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN

1.

Disconnect front blower motor relay.

2.

Check continuity between front blower motor relay harness con-
nector E22 (A) terminals 3, 5 and variable blower control har-
ness connector M122 (B) terminal 4.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Repair harness or connector.

14.

CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT

Check continuity between variable blower control harness connector
M122 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Repair harness or connector.

15.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT

1.

Reconnect all disconnected component connectors.

2.

Disconnect A/C auto amp. connector.

3.

Turn ignition switch ON.

4.

Press the blower (+) switch to maximum speed.

5.

Check voltage between A/C auto amp. harness connector M49
terminal 13 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

NO

>> GO TO 16.

16.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT FOR OPEN

1 - 2

: Continuity should exist.

AWIIA0179ZZ

3 - 4

: Continuity should exist.

AWIIA0243ZZ

1 - Ground

: Continuity should exist.

AWIIA0180ZZ

13 - Ground

: Approx. 4.5V

AWIIA1129ZZ

2009 Pathfinder

HAC-52

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

1.

Disconnect variable blower control connector.

2.

Check continuity between A/C auto amp. harness connector
M49 (B) terminal 13 and variable blower control harness con-
nector M122 (A) terminal 3.

Is the inspection result normal?

YES

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

VTL-14,

"Removal and Installation"

.

NO

>> Repair harness or connector.

Front Blower Motor Component Inspection

INFOID:0000000003935900

COMPONENT INSPECTION 

Front Blower Motor Relay

Check continuity between terminals 6-7 and 3-5 by supplying 12
volts to terminal 1 and ground to terminal 2 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.

Rear Blower Motor Description

INFOID:0000000003935901

SYSTEM DESCRIPTION

Component Parts

Rear blower speed control system components are:
• A/C auto amp.

13 - 3

: Continuity should exist.

AWIIA0178ZZ

LJIA0068E

WJIA1508E

2009 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-53

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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• A/C and AV switch assembly
• Rear air control (front)
• Rear air control (rear)
• Variable blower control (rear)
• Rear blower motor
• Rear blower motor relay

System Operation

Rear Blower Control

When the rear blower control dial (front) REAR CTRL switch is pressed (indicator on), it allows the rear air
control (rear) to control the rear blower motor speed. If the REAR CTRL switch is off (indicator off), the rear air
control (front) controls the rear blower motor speed regardless of the rear air control (rear) position.

Rear Blower Motor Component Function Check

INFOID:0000000003935902

SYMPTOM:
• Rear blower motor does not operate from the rear air control (front) and the rear air control (rear).
• Rear blower motor operates from rear air control (front) only.
• Rear blower motor operates from rear air control (rear) only.
• Rear blower motor speed does not match the rear air control (front) speed selected.
• Rear blower motor speed does not match the rear air control (rear) speed selected.
• Rear blower motor operates in high all the time when controlled from the rear air control (front).
• Rear blower motor operates in high all the time when controlled from the rear air control (rear).

INSPECTION FLOW

1.

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

1.

Press AUTO switch.

2.

Turn the rear air control (front) blower control dial to the lowest speed and check for rear blower operation
(REAR CTRL indicator off).

3.

Continue checking that rear blower speed increases as the rear blower control dial is rotated clockwise.

Does the rear blower motor operate correctly?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

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

1.

Press the REAR CTRL switch (indicator on) on the rear air control (front) to send control of the rear blower
motor back the rear air control (rear).

2.

Turn the rear air control (rear) blower control dial to the lowest speed and check for rear blower operation.

3.

Continue checking that rear blower speed increases as the rear blower control dial is rotated clockwise.

Does the rear blower motor operate correctly?

YES

>> • Rear blower motor does not operate at any speed from the rear air control (front). Refer to 

HAC-

54, "Rear Air Control (Front) Diagnosis Procedure #1"

.

AWIIA0181GB

2009 Pathfinder

HAC-54

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

• Rear blower motor operates in high speed all the time or does not match the rear air control

(front) speed selected. Refer to 

HAC-55, "Rear Air Control (Rear) Diagnosis Procedure #2"

.

NO

>> • Rear blower motor does not operate from the rear air control (front) and the rear air control

(rear). Refer to 

HAC-56, "Rear Air Control (Rear) Diagnosis Procedure #3"

3.

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

1.

Press the REAR CTRL switch (indicator on) on the rear air control (front) to send control of the rear blower
motor back the rear air control (rear).

2.

Turn the rear air control (rear) blower control dial to the lowest speed and check for rear blower operation.

3.

Continue checking that rear blower speed increases as the rear blower control dial is rotated clockwise.

Does the rear blower motor operate correctly?

YES

>> GO TO 4.

NO

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

HAC-59, "Rear Air Control (Rear) Diagnosis Procedure #4"

.

4.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 5.

5.

RECHECK FOR ANY SYMPTOMS 

Perform a complete operational check for any symptoms. Refer to 

HAC-5, "Operational Check (Front)"

.

Does another symptom exist?

YES

>> Refer to 

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

. 

NO

>> Inspection End.

Rear Air Control (Front) Diagnosis Procedure #1

INFOID:0000000003935903

TROUBLE DIAGNOSIS PROCEDURE

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) FRONT AUX BLOWER POT REFERENCE VOLTAGE

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 6 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK REAR AIR CONTROL (FRONT) GROUND CIRCUIT

Battery voltage should exist.

AWIIA0253ZZ

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (front): R2

6

Ground

5V

AWIIA0252ZZ

2009 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-55

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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

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 #2

INFOID:0000000003935904

TROUBLE DIAGNOSIS PROCEDURE 

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) FRONT AUX BLOWER POT REFERENCE VOLTAGE

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 6 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

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

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

VTL-7,

"Removal and Installation"

.

NO

>> Repair harness or connector.

4.

CHECK REAR AIR CONTROL (FRONT) BLOWER POT CIRCUIT FOR OPEN

Continuity should exist.

AWIIA0254ZZ

Battery voltage should exist.

AWIIA0253ZZ

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Rear air control (front): R2

6

Ground

5V

AWIIA0252ZZ

Continuity should exist.

AWIIA0254ZZ

2009 Pathfinder

HAC-56

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR 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 38 and rear air control (front) harness connec-
tor R2 (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 Air Control (Rear) Diagnosis Procedure #3

INFOID:0000000003935905

TROUBLE DIAGNOSIS PROCEDURE

1.

CHECK REAR AIR CONTROL (FRONT)

1.

Disconnect rear air control (front) connector.

2.

Turn ignition switch ON.

3.

Press AUTO switch.

Does rear blower motor operate in high speed?

YES

>> GO TO 17.

NO

>> GO TO 2.

2.

CHECK REAR BLOWER MOTOR POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect rear blower motor harness connector.

3.

Turn ignition switch ON.

4.

Press AUTO switch.

5.

Rotate rear air control (front) blower speed control dial to maxi-
mum speed (REAR CTRL indicator off).

6.

Check voltage between rear blower motor harness connector
B201 terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 9.

3.

CHECK VARIABLE BLOWER CONTROL (REAR) POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect variable blower control (rear) connector.

3.

Turn ignition switch ON.

4.

Check voltage between variable blower control connector B133
terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK VARIABLE BLOWER CONTROL (REAR) AUX BLOWER SPEED SIGNAL CIRCUIT FOR SHORT

Continuity should exist.

AWIIA0244ZZ

Battery voltage should exist.

AWIIA0255ZZ

Battery voltage should exist.

AWIIA0245ZZ

2009 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-57

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Check voltage between variable blower control (rear) harness con-
nector B133 terminal 3 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 8.

5.

CHECK VARIABLE BLOWER CONTROL (REAR) GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between variable blower control (rear) harness
connector B133 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

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 7.

NO

>> Replace rear blower motor. Refer to 

VTL-12, "Removal and Installation"

.

7.

CHECK VARIABLE BLOWER CONTROL (REAR) BLOWER MOTOR GROUND CIRCUIT

Check continuity between rear blower motor connector B501 (B) ter-
minal 1 and variable blower control (rear) connector B133 (A) termi-
nal 2.

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 VARIABLE BLOWER CONTROL (REAR) AUX BLOWER SPEED CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector.

3.

Check continuity between A/C auto amp. harness connector
M49 (A) terminal 12 and variable blower control (rear) harness
connector B133 (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.

9.

CHECK FUSES

Check 15A fuses [Nos. 10 and 11, located in the fuse block (J/B)].

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Variable blower control: B133

3

Ground

4.5 V

AWIIA0246ZZ

Continuity should exist.

AWIIA0247ZZ

Continuity should exist.

AWIIA0248ZZ

Continuity should exist.

AWIIA0249ZZ

2009 Pathfinder

HAC-58

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 14.

10.

CHECK REAR BLOWER MOTOR RELAY

Check rear blower motor relay. Refer to 

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

.

Is the inspection result normal?

YES

>> GO TO 11. 

NO

>> Replace rear blower motor relay.

11.

CHECK REAR BLOWER MOTOR CIRCUIT BETWEEN REAR BLOWER MOTOR AND FUSE BLOCK (J/

B)

1.

Turn ignition switch OFF.

2.

Disconnect fuse block (J/B) M3 harness connector.

3.

Check continuity between fuse block (J/B) harness connector
M3 (A) terminal 3N and 8N and rear blower motor harness con-
nector B501 (B) terminal 2.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Repair harness or connector.

12.

CHECK REAR BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT

Check continuity between fuse block (J/B) harness connector M3
terminal 7N and ground.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair harness or connector.

13.

CHECK REAR BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY CIRCUIT FOR OPEN

1.

Turn ignition switch ON.

2.

Check voltage between rear blower motor relay harness con-
nector J-1 terminal 1 and ground.

Is the inspection result normal?

YES

>> Replace fuse block (J/B). 

NO

>> Repair harness or connector.

14.

REPLACE FUSE

1.

Turn ignition switch OFF.

2.

Replace fuses.

3.

Reconnect all disconnected parts.

4.

Turn ignition switch ON.

5.

Activate the rear blower motor from the rear air control (front).

Does the fuse blow?

YES

>> GO TO 15.

Continuity should exist.

AWIIA0250ZZ

Continuity should exist.

LJIA0102E

Battery voltage should exist.

AWIIA1192ZZ

2009 Pathfinder