Nissan Pathfinder (2012 year). Manual — part 428

HAC-146

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

AIR MIX DOOR MOTOR

AIR MIX DOOR MOTOR

System Description

INFOID:0000000007356428

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

August 2012

2012 Pathfinder

AIR MIX DOOR MOTOR

HAC-147

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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The air mix door motor (1) 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 (

⇒

: Front).

↓

Air Mix Door Motor Component Function Check

INFOID:0000000007356429

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.
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to

HAC-147, "Air Mix Door Motor Diagnosis Procedure"

.

Air Mix Door Motor Diagnosis Procedure

INFOID:0000000007356430

Regarding Wiring Diagram information, refer to

HAC-172, "Wiring Diagram - Manual"

.

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

1.

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

1. Turn ignition switch OFF.

2. Disconnect the front air control harness connector M52 and the air mix door motor harness connector

M149.

3. Check continuity between front air control harness connector M52 terminals 2, 3 and the air mix door

motor harness connector M149 terminals 5, 6.

4. Check continuity between front air control harness connector M52 terminals 2, 3 and ground.

AWIIA1195ZZ

Connector

Terminal

Connector

Terminal

Continuity

M52

2

M149

6

Yes

3

5

Connector

Terminal

—

Continuity

M52

2

Ground

No

3

August 2012

2012 Pathfinder

HAC-148

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

AIR MIX DOOR MOTOR

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness as necessary.

2.

CHECK FRONT AIR CONTROL FOR AIR MIX DOOR MOTOR POWER AND GROUND

1. Reconnect front air control harness connector.

2. Turn ignition switch ON.

3. Rotate temperature control dial to 32

°

C (90

°

F).

4. Check voltage between front air control harness connector M52 terminal 2 and terminal 3 while rotating

temperature control dial to 18

°

C (60

°

F) and back to 32

°

C (90

°

F).

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace front air control. Refer to

VTL-7, "Removal and Installation"

.

3.

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

1. Turn ignition switch OFF.

2. Disconnect the front air control harness connector M52.

3. Check continuity between front air control harness connector M52 terminals 23, 26 and air mix door motor

harness connector M149 terminals 1, 3.

4. Check continuity between front air control harness connector M52 terminals 23, 26 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness as necessary.

4.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND

1. Check continuity between front air control harness connector M52 terminal 22 and air mix door motor har-

ness connector M149 terminal 2.

2. Check continuity between front air control harness connector M52 terminal 22 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness as necessary.

Connector

Terminals

Condition Voltage

(Approx.)

(+) (-)

M52

2

3

While rotating temperature control

dial from 32

°

C (90

°

F) to 18

°

C (60

°

F)

Battery voltage

3

2

While rotating temperature control

dial from 18

°

C (60

°

F) to 32

°

C (90

°

F)

Battery voltage

Connector

Terminal

Connector

Terminal

Continuity

M52

23

M149

1

Yes

26

3

Connector

Terminal

—

Continuity

M52

23

Ground

No

26

Connector

Terminal

Connector

Terminal

Continuity

M52

22

M149

2

Yes

Connector

Terminal

—

Continuity

M52

22

Ground

No

August 2012

2012 Pathfinder

AIR MIX DOOR MOTOR

HAC-149

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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5.

CHECK FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK

SIGNAL

1. Reconnect front air control harness connectors.

2. Turn ignition switch ON.

3. Check voltage between front air control harness connector M52 terminal 23 and terminal 26.

4. Check voltage between front air control harness connector M52 terminal 22 and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace front air control. Refer to

VTL-7, "Removal and Installation"

.

6.

CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL

1. Reconnect the air mix door motor harness connector M149.

2. Check voltage between front air control harness connector M52 terminal 22 and ground.

Is the inspection result normal?

YES

>> Inspect air mix door for binding or mechanical failure. If air mix door moves freely, replace front air

control. Refer to

VTL-7, "Removal and Installation"

.

NO

>> Replace air mix door motor. Refer to

VTL-30, "Removal and Installation"

.

Connector

Terminal

Connector

Terminal

Voltage (Approx.)

(+)

(-)

M52

23

M52

26

5V

Connector

Terminal

—

Voltage (Approx.)

M52

22

Ground

0V

Connector

Terminal

—

Voltage (Approx.)

M52

22

Ground

0.2 to 4.8V

August 2012

2012 Pathfinder

HAC-150

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INTAKE DOOR MOTOR

INTAKE DOOR MOTOR

System Description

INFOID:0000000007356431

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:0000000007356432

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

August 2012

2012 Pathfinder

INTAKE DOOR MOTOR

HAC-151

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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2. Turn mode dial to vent mode (

).

3. Press REC (

) switch.

4. Press REC (

) switch again.

5. Listen for intake door position change (you should hear blower sound change slightly).
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to

HAC-151, "Intake Door Motor Diagnosis Procedure"

.

Intake Door Motor Diagnosis Procedure

INFOID:0000000007356433

Regarding Wiring Diagram information, refer to

HAC-172, "Wiring Diagram - Manual"

.

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

1.

CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE

1. Turn ignition switch OFF.

2. Disconnect intake door motor connector.

3. Turn ignition switch ON.

4. Rotate the temperature control dial counterclockwise.

5. Check voltage between intake door motor harness connector

M58 terminal 6 and ground.

Is inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect front air control connector.

3. Check continuity between front air control harness connector

M52 (A) terminal 5 and intake door motor harness connector

M58 (B) terminal 6.

Is inspection result normal?

YES

>> Replace front air control. Refer to

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

3.

CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE

1. Rotate the temperature control dial clockwise.

2. Check voltage between intake door motor harness connector

M58 terminal 1 and ground.

Is inspection result normal?

YES

>> Replace intake door motor. Refer to

VTL-27, "Removal

and Installation"

.

NO

>> GO TO 4.

4.

CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN

6 - Ground

: Battery voltage

AWIIA0853ZZ

5 - 6

: Continuity should exist.

AWIIA0854ZZ

1 - Ground

:Battery voltage

AWIIA0848ZZ

August 2012

2012 Pathfinder

HAC-152

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INTAKE DOOR MOTOR

1. Turn ignition switch OFF.

2. Disconnect front air control connector.

3. Check continuity between front air control harness connector

M52 (A) terminal 4 and intake door motor harness connector

M58 (B) terminal 1.

Is inspection result normal?

YES

>> Replace front air control. Refer to

VTL-7, "Removal and Installation"

.

NO

>> Repair or replace harness as necessary.

A

B

Connector

Terminal Connector

Terminal

Continuity

Front air control:

M52

4

Intake door motor:

M58

1

Yes

AWIIA0855ZZ

August 2012

2012 Pathfinder

BLOWER MOTOR

HAC-153

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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BLOWER MOTOR

System Description

INFOID:0000000007356434

Component Parts

Blower speed control system components are:

• Front air control

• Front blower motor resistor

• Front blower motor

• Front blower relay

System Operation

COMPONENT DESCRIPTION

Blower Motor Resistor

The front blower motor resistor (1) is located on the heater and cool-

ing unit assembly. The front blower motor resistor grounds the front

blower motor through a series of 1, 2, or 3 resistors, depending upon

speed selected. For high speed operation the front blower motor

resistor is circumvented and the front blower motor grounds directly

(

⇒

: Front).

Front Blower Motor Component Function Check

INFOID:0000000007356435

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER

1. Rotate the blower control dial clockwise. Blower should operate.

2. Rotate the blower control dial clockwise, and continue checking blower speed until all speeds are

checked.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to

HAC-154, "Front Blower Motor Diagnosis Procedure"

.

AWIIA0272GB

AWIIA1196ZZ

August 2012

2012 Pathfinder