Nissan Pathfinder (2008 year). Manual - part 449

HAC-136

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MODE DOOR MOTOR

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR

1.

Turn blower control dial to 4. 

2.

Turn the mode dial and check all positions. 

3.

Confirm that discharge air comes out according to the air distribution table. Refer to 

HAC-131, "Discharge

Air Flow"

.

NOTE:
Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH
when DEF (

) or D/F (

) is selected.

Can a symptom be duplicated?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to 

HAC-123, "Operational Check"

.

Can a symptom be duplicated?

YES

>> Refer to 

HAC-171, "Symptom Matrix Chart"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

CHECK MODE DOOR OPERATION

Check and verify mode door mechanism for smooth operation in each mode.

Is inspection result normal?

YES

>> GO TO 5.

NO

>> Repair as necessary.

5.

CHECK THE MODE DOOR MOTOR PBR CIRCUIT 

Perform diagnostic procedure for the mode door motor. Refer to XX-XX, "*****".
Is inspection result normal?

YES

>> GO TO 6.

NO

>> Repair PBR circuit or replace motor.

6.

RECHECK FOR SYMPTOMS 

Perform a complete operational check and check for any symptoms. Refer to 

HAC-123, "Operational Check"

.

Does another symptom exist?

YES

>> Repair as necessary. 

NO

>> Replace front air control. Refer to XX-XX, "*****".

Mode Door Motor (Front) Diagnosis Procedure

INFOID:0000000001366784

MODE DOOR MOTOR DIAGNOSTIC PROCEDURE

1.

CHECK POWER SUPPLY AND GROUND CIRCUITS FOR MODE DOOR MOTOR

MODE DOOR MOTOR

HAC-137

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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1.

Turn ignition switch OFF.

2.

Disconnect front air control connector and mode door motor
connector.

3.

Check continuity between front air control harness connector
M49 terminal 1 and mode door motor harness connector M142
terminal 1 and between front air control harness connector M49
terminal 14 and mode door motor harness connector M142 ter-
minal 6.

Is inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness as necessary.

2.

CHECK PBR REFERENCE SIGNAL VOLTAGE

1.

Reconnect the front air control connector.

2.

Turn ignition switch ON.

3.

Check voltage between mode door motor harness connector
M142 terminal 3 and ground.

Is inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN MODE DOOR AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between mode door motor harness connector
M142 terminal 3 and front air control harness connector M49 ter-
minal 23.

Is inspection result normal?

YES

>> Replace front air control. Refer to XX-XX.

NO

>> Repair or replace harness as necessary.

4.

CHECK PBR GROUND REFERENCE CIRCUIT 

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between mode door motor harness connector
M142 terminal 2 and front air control harness connector M49 ter-
minal 26.

Is inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness as necessary.

5.

CHECK PBR FEEDBACK SIGNAL

1 - 1

: Continuity should exist.

14 - 6

: Continuity should exist.

WJIA1241E

 3 - Ground

: Approx. 5V

WJIA1242E

3 - 23

: Continuity should exist.

WJIA1085E

2 - 26

: Continuity should exist.

WJIA1087E

HAC-138

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MODE DOOR MOTOR

1.

Reconnect the front air control connector and mode door motor
connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M49
terminal 21 and ground.

4.

Press mode switch through all modes.

Is inspection result normal?

YES

>> Replace front air control. Refer to XX-XX.

NO

>> GO TO 6.

6.

CHECK PBR FEEDBACK CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the mode door motor connector and front air control
harness connector.

3.

Check continuity between mode door motor harness connector
M142 terminal 4 and front air control harness connector M49 ter-
minal 21.

Is inspection result normal?

YES

>> Replace mode door motor. Refer to XX-XX.

NO

>> Repair or replace harness as necessary.

21 - Ground

: Approx. 0 - 5V

WJIA1088E

4 - 21

: Continuity should exist.

WJIA1089E

AIR MIX DOOR MOTOR

HAC-139

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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AIR MIX DOOR MOTOR

System Description

INFOID:0000000001366785

SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:

• Front air control
• Air mix door motor 
• PBR (built into air mix door motor)
• Intake sensor

System Operation

The front air control receives data from the temperature selected by the driver. The front air control then
applies a voltage to one circuit of the air mix door motor, while ground is applied to the other circuit, causing
the air mix door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to
it, and which one has ground applied to it. The front air control monitors the air mix door positions by measur-
ing the voltage signal on the PBR circuits of each door.

Air Mix Door Control Specification

COMPONENT DESCRIPTION

Air Mix Door Motors

WJIA1316E

WJIA0435E

HAC-140

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

AIR MIX DOOR MOTOR

The air mix door motor is attached to the front heater and cooling
unit assembly. This motor rotates so that the air mix door is opened
or closed to a position set by the front air control. Motor rotation is
then conveyed through a shaft and the air mix door position is then
fed back to the front air control by the PBR built into the air mix door
motor.

Air Mix Door Motor Component Function Check

INFOID:0000000001366786

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1.

Blower must be on (1, 2, 3, 4).

2.

Turn the temperature control dial clockwise to maximum heat.

3.

Check for hot air at discharge air outlets.

>> GO TO 2.

2.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE

1.

Turn the temperature control dial counterclockwise to maximum cold.

2.

Check for cold air at discharge air outlets.

Can a symptom be duplicated?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to 

HAC-123, "Operational Check"

.

Can a symptom be duplicated?

YES

>> Refer to 

HAC-171, "Symptom Matrix Chart"

.

NO

>> System OK.

4.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 5.

5.

CHECK AIR MIX DOOR OPERATION

Check and verify air mix door mechanism for smooth operation from maximum cold to maximum heat in each
mode.

OK or NG

OK

>> GO TO 6.

NG

>> Repair as necessary.

6.

CHECK THE AIR MIX DOOR MOTOR PBR CIRCUIT 

Perform diagnostic procedure for the air mix door motor. Refer to 

HAC-141, "Air Mix Door Motor Diagnosis

Procedure"

.

OK or NG

OK

>> GO TO 7.

NG

>> Repair PBR circuit or replace air mix door motor. Refer to XX-XX, "*****".

7.

RECHECK FOR ANY SYMPTOMS 

Perform a complete operational check for any symptoms. Refer to 

HAC-123, "Operational Check"

.

WJIA1485E

AIR MIX DOOR MOTOR

HAC-141

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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Does another symptom exist?

YES

>> Refer to 

HAC-171, "Symptom Matrix Chart"

. 

NO

>> Replace front air control. Refer to XX-XX, "*****".

Air Mix Door Motor Diagnosis Procedure

INFOID:0000000001366787

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR

1.

CHECK POWER SUPPLY CIRCUITS FOR AIR MIX DOOR MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector and air mix door motor
(front) connector.

3.

Check continuity between front air control harness connector
M49 terminal 2 and 3 and air mix door motor (front) harness
connector M147 terminal 6 and 5.

Is inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness as necessary.

2.

CHECK PBR REFERENCE SIGNAL VOLTAGE

1.

Reconnect the front air control connector.

2.

Turn ignition switch ON.

3.

Check voltage between air mix door motor (front) harness con-
nector M147 terminal 1 and ground.

Is inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN AIR MIX DOOR MOTOR (FRONT) AND

FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between air mix door motor (front) harness
connector M147 (B) terminal 1 and front air control harness con-
nector M49 (A) terminal 23.

Is inspection result normal?

YES

>> Replace front air control. Refer to XX-XX, "*****".

NO

>> Repair or replace harness as necessary.

4.

CHECK PBR GROUND REFERENCE CIRCUIT 

2 - 6

: Continuity should exist.

3 - 5

: Continuity should exist.

WJIA1318E

 1 - Ground

: Approx. 5V

WJIA1319E

A

B

Connector

Terminal Connector

Terminal 

Continuity

Front air control: 

M49

23 

Air mix door motor 

(front): M143

1

Yes

WJIA1656E

HAC-142

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

AIR MIX DOOR MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between air mix door motor (front) harness
connector M147 terminal 3 and front air control harness connec-
tor M49 terminal 26.

Is inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness as necessary.

5.

CHECK PBR FEEDBACK SIGNAL

1.

Reconnect the front air control connector and air mix door motor
(front) connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M49
terminal 22 and ground.

4.

Rotate temperature control dial through complete range.

Is inspection result normal?

YES

>> Replace front air control. Refer to XX-XX, "*****".

NO

>> GO TO 6.

6.

CHECK PBR FEEDBACK CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the air mix door motor (front) connector and front air
control connector.

3.

Check continuity between air mix door motor (front) harness
connector M147 terminal 2 and front air control harness connec-
tor M49 terminal 22.

Is inspection result normal?

YES

>> Replace air mix door motor (front). Refer to XXXX.

NO

>> Repair or replace harness as necessary.

3 - 26

: Continuity should exist.

WJIA1320E

22 - Ground

: Approx. 0V - 5V

WJIA1096E

2 - 22

: Continuity should exist.

WJIA1321E

INTAKE DOOR MOTOR

HAC-143

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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INTAKE DOOR MOTOR

System Description

INFOID:0000000001366789

SYSTEM DESCRIPTION

Component Parts

Intake door control system components are:

• Front air control
• Intake door motor
• Intake sensor

System Operation

The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.

COMPONENT DESCRIPTION

Intake door motor

The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the front air control. Motor rotation is
conveyed to a lever which activates the intake door.

Intake Door Motor Component Function Check

INFOID:0000000001366790

SYMPTOM:

• Intake door does not change.
• Intake door motor does not operate normally.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (

)

1.

Turn blower control dial to 4.

WJIA1478E

WJIA1486E