Nissan Pathfinder (2011 year). Manual - part 446

AIR MIX DOOR MOTOR

HAC-31

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Air Mix Door Control Specification

COMPONENT DESCRIPTION

Air Mix Door Motors (front)

The driver (2) and passenger (1) air mix door motors are attached to

the front heater & cooling unit assembly. These motors rotate so that

the air mix door is opened or closed to a position set by the A/C auto

amp. Motor rotation is then conveyed through a shaft and the air mix

door position is then fed back to the A/C auto amp. by the PBR built

into the air mix door motors.

Air Mix Door Motor (rear)

The air mix door motor (rear) (1) is attached to the rear heater &

cooling unit assembly. These motors rotate so that the air mix door is

opened or closed to a position set by the front (or rear) air control.

Motor rotation is then conveyed through a shaft and the air mix door

position is then fed back to the A/C auto amp. by the PBR built into

the air mix door motors.

Air Mix Door Motor (Driver) Component Function Check

INFOID:0000000006243636

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1. Turn the temperature control dial (driver) clockwise until 32

°

C (90

°

F) is displayed.

2. Check for hot air at discharge air outlets.

AWIIA0107GB

WJIA1978E

WJIA1979E

WJIA1979E

WJIA1245E

2011 Pathfinder

HAC-32

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

>> GO TO 2.

2.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE

1. Turn the temperature control dial (driver) counterclockwise until 18

°

C (60

°

F) is displayed.

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-39, "Intake Door Motor Diagnosis Procedure"

.

Air Mix Door Motor (Driver) Diagnosis Procedure

INFOID:0000000006243637

Regarding Wiring Diagram information, refer to 

HAC-95, "Wiring Diagram - Automatic"

.

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

1.

CHECK AIR MIX DOOR MOTOR (DRIVER) POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLT-

AGE
1. Turn ignition switch ON.

2. Using CONSULT-III, check "DVR MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to 

HAC-21,

"CONSULT-III Function (HVAC)"

.

3. Observe "DVR MIX FDBACK" voltage while rotating temperature control dial (driver) between 32

°

C (90

°

F)

and 18

°

C (60

°

F).

Is the inspection result normal?

YES

>> • Air mix door motor (driver) is OK.

• Inspect air mix door (driver) for mechanical failure and repair if necessary. If air mix door (driver)

is OK, refer to 

HAC-112, "Component Function Check"

 for insufficient cooling or 

HAC-120,

"Component Function Check"

 for insufficient heating.

NO

>> GO TO 2.

2.

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

1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connector M49 and the air mix door motor (driver) harness con-

nector M147.

3. Check continuity between A/C auto amp. harness connector M49 terminals 17, 18 and the air mix door

motor (driver) harness connector M147 terminals 5, 6.

4. Check continuity between A/C auto amp. harness connector M49 terminals 17, 18 and ground.

Is the inspection result normal?

Monitor Item

Condition

Results

DVR MIX FDBCK

Rotate temperature control dial (driver) be-

tween 32

°

C (90

°

F) and 18

°

C (60

°

F)

Voltage varies with dial rotation between 0.2 and 4.8V.

Connector

Terminal

Connector

Terminal

Continuity

M49

17

M147

6

Yes

18

5

Connector

Terminal

—

Continuity

M49

17

Ground

No

18

2011 Pathfinder

AIR MIX DOOR MOTOR

HAC-33

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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YES

>> GO TO 3.

NO

>> Repair or replace harness as necessary.

3.

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

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

2. Turn ignition switch ON.

3. Rotate temperature control dial (driver) to 32

°

C (90

°

F).

4. Check voltage between A/C auto amp. harness connector M49 terminal 17 and terminal 18 while rotating

temperature control dial (driver) to 18

°

C (60

°

F) and back to 32

°

C (90

°

F).

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

4.

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

1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connectors.

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

and air mix door motor (driver) harness connector M147 terminals 1, 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 5.

NO

>> Repair or replace harness as necessary.

5.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND 

1. Check continuity between A/C auto amp. harness connector M49 terminal 6 and air mix door motor

(driver) harness connector M147 terminal 2.

2. Check continuity between A/C auto amp. harness connector M49 terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 6.

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M49

17

18

While rotating temperature control 

dial (driver) from 32

°

C (90

°

F) to 18

°

C 

(60

°

F)

Battery voltage

18

17

While rotating temperature control 

dial (driver) from 18

°

C (60

°

F) to 32

°

C 

(90

°

F)

Battery voltage

Connector

Terminal

Connector

Terminal

Continuity

M49

3

M147

3

Yes

M50

28

1

Connector

Terminal

—

Continuity

M49

3

Ground

No

M50

28

Connector

Terminal

Connector

Terminal

Continuity

M49

6

M147

2

Yes

Connector

Terminal

—

Continuity

M49

6

Ground

No

2011 Pathfinder

HAC-34

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

NO

>> Repair or replace harness as necessary.

6.

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

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.

4. Check voltage between A/C auto amp. harness connector M49 terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

7.

CHECK A/C AUTO AMP. FOR FEEDBACK SIGNAL 

1. Reconnect the air mix door motor (driver) harness connector M147.

2. Check voltage between A/C auto amp. harness connector M49 terminal 6 and ground.

Is the inspection result normal?

YES

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

replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Replace air mix door motor (driver). Refer to 

VTL-29, "Removal and Installation"

.

Air Mix Door Motor (Passenger) Component Function Check

INFOID:0000000006243638

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1. Turn the temperature control dial (driver) clockwise until 32

°

C (90

°

F) is displayed.

2. 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 (driver) counterclockwise until 18

°

C (60

°

F) is displayed.

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-39, "Intake Door Motor Diagnosis Procedure"

.

Air Mix Door Motor (Passenger) Diagnosis Procedure

INFOID:0000000006243639

Regarding Wiring Diagram information, refer to 

HAC-95, "Wiring Diagram - Automatic"

.

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-) 

M50

28

M49

3

5V

Connector

Terminal

—

Voltage (Approx.)

M49

6

Ground

0V

Connector

Terminal

—

Voltage (Approx.)

M49

6

Ground

0.2 to 4.8V

2011 Pathfinder

AIR MIX DOOR MOTOR

HAC-35

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (PASSENGER)

1.

CHECK AIR MIX DOOR MOTOR (PASSENGER) POSITION BALANCED RESISTOR (PBR) FEEDBACK

VOLTAGE

1. Turn ignition switch ON.

2. Using CONSULT-III, check "PAS MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to 

HAC-21,

"CONSULT-III Function (HVAC)"

.

3. Observe "PAS MIX FDBCK" voltage while rotating temperature control dial (passenger) between 32

°

C

(90

°

F) and 18

°

C (60

°

F).

Is the inspection result normal?

YES

>> • Air mix door motor (passenger) is OK.

• Inspect air mix door (passenger) for mechanical failure and repair if necessary. If air mix door

(passenger) is OK, refer to 

HAC-112, "Component Function Check"

 for insufficient cooling or

HAC-120, "Component Function Check"

 for insufficient heating.

NO

>> GO TO 2.

2.

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

1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connector M49 and the air mix door motor (passenger) harness

connector M143.

3. Check continuity between A/C auto amp. harness connector M49 terminals 2, 14 and the air mix door

motor (passenger) harness connector M143 terminals 5, 6.

4. Check continuity between A/C auto amp. harness connector M49 terminals 2, 14 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness as necessary.

3.

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

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

2. Turn ignition switch ON.

3. Rotate temperature control dial (passenger) to 32

°

C (90

°

F).

4. Check voltage between A/C auto amp. harness connector M49 terminal 2 and terminal 14 while rotating

temperature control dial (passenger) to 18

°

C (60

°

F) and back to 32

°

C (90

°

F).

Is the inspection result normal?

YES

>> GO TO 4.

Monitor Item

Condition

Results

PAS MIX FDBCK

Rotate temperature control dial (passenger) be-

tween 32

°

C (90

°

F) and 18

°

C (60

°

F)

Voltage varies between 0.2 and 4.8V.

Connector

Terminal

Connector

Terminal

Continuity

M49

14

M143

6

Yes

2

5

Connector

Terminal

—

Continuity

M49

14

Ground

No

2

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M49

2

14

Rotate temperature control dial (pas-

senger) to 18

°

C (60

°

F)

Battery voltage

14

2

Rotate temperature control dial (pas-

senger) to 32

°

C (90

°

F)

Battery voltage

2011 Pathfinder

HAC-36

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

4.

CHECK AIR MIX DOOR MOTOR (PASSENGER) 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 (passenger) harness connector M143 terminal 1, 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 5.

NO

>> Repair or replace harness as necessary.

5.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND 

1. Check continuity between A/C auto amp. harness connector M50 terminal 29 and air mix door motor (pas-

senger) harness connector M143 terminal 2.

2. Check continuity between A/C auto amp. harness connector M50 terminal 29 and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace harness as necessary.

6.

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

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.

4. Check voltage between A/C auto amp. harness connector M50 terminal 29 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

Connector

Terminal

Connector

Terminal

Continuity

M49

3

M143

3

Yes

M50

28

1

Connector

Terminal

—

Continuity

M49

3

Ground

No

M50

28

Connector

Terminal

Connector

Terminal

Continuity

M50

29

M143

2

Yes

Connector

Terminal

—

Continuity

M50

29

Ground

No

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-) 

M50

28

M49

3

5V

Connector

Terminal

—

Voltage (Approx.)

M50

29

Ground

0V

2011 Pathfinder

AIR MIX DOOR MOTOR

HAC-37

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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HAC

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7.

CHECK A/C AUTO AMP. FOR FEEDBACK SIGNAL 

1. Reconnect the air mix door motor (passenger) harness connector M143.

2. Check voltage between A/C auto amp. harness connector M50 terminal 29 and ground.

Is the inspection result normal?

YES

>> Inspect air mix door (passenger) for binding or mechanical failure. If air mix door (passenger)

moves freely, replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

NO

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

VTL-29, "Removal and Installation"

.

Connector

Terminal

—

Voltage (Approx.)

M50

29

Ground

0.2 to 4.8V

2011 Pathfinder

HAC-38

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE DOOR MOTOR

INTAKE DOOR MOTOR

System Description

INFOID:0000000006243640

SYSTEM DESCRIPTION

SYMPTOM:

• Intake door motor does not operate normally.

• Intake door does not change.

SYSTEM DESCRIPTION

Component Parts

Intake door control system components are:

• A/C auto amp.

• A/C and AV switch assembly

• Intake door motor (PRB built into the intake door motor)

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• 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.

In the AUTO mode, the A/C auto amp. determines the intake door position based on the ambient temperature,

the intake air temperature and the in-vehicle temperature. When the DEF, D/F, FOOT or OFF switches are

pushed, the A/C auto amp. sets the intake door at the fresh position.

Intake Door Control Specification

AWIIA0144GB

AWIIA0145GB

2011 Pathfinder