Nissan Pathfinder (2012 year). Manual - part 413

HAC-26

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR MOTOR

DTC/CIRCUIT DIAGNOSIS

MODE DOOR MOTOR

System Description

INFOID:0000000007356351

SYSTEM DESCRIPTION

Component Parts

Mode door control system components are:

• A/C auto amp.

• A/C and AV switch assembly

• Mode door motor (front)

• PBR (built into mode door motor)

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• Intake sensor

System Operation

The mode door position (vent, B/L, foot, D/F, and defrost) is set by the A/C auto amp. by means of the mode

door motor (front). When a mode door position is selected on the A/C auto amp., voltage is applied to one cir-

cuit of the mode door motor (front) while ground is applied to the other circuit, causing the mode door motor

(front) 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 A/C auto amp. monitors the mode door position by measuring the voltage signal

on the PBR circuit.

In AUTO mode the mode door position is set by the A/C auto amp. which determines the proper position

based on inputs from the in-vehicle sensor, ambient sensor, optical sensor, intake sensor, and the temperature

selected by the driver or passenger.

Mode Door Control Specification

COMPONENT DESCRIPTION

Mode Door Motor (Front)

AWIIA0092GB

AWIIA0093GB

August 2012

2012 Pathfinder

MODE DOOR MOTOR

HAC-27

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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The mode door motor (front) is attached to the heater & cooling unit

assembly. It rotates so that air is discharged from the outlet as indi-

cated by the A/C auto amp. Motor rotation is conveyed to a link

which activates the mode door.

Mode Door Motor (Front) Component Function Check

INFOID:0000000007356352

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR

1. Press mode switch four times and then press the 

 (DEF) switch. Each position indicator should change

shape (on display).

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

HAC-18, "Discharge

Air Flow (Front)"

.

NOTE:

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

 when FOOT (

), DEF (

) or D/F (

) is selected.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to  

HAC-27, "Mode Door Motor (Front) Diagnosis Procedure"

.

Mode Door Motor (Front) Diagnosis Procedure

INFOID:0000000007356353

Regarding Wiring Diagram information, refer to 

HAC-95, "Wiring Diagram - Automatic"

.

SYMPTOM:

• Air outlet does not change.

• Mode door motor does not operate normally.

1.

CHECK MODE DOOR MOTOR POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE

1. Turn ignition switch ON.

2. Using CONSULT, check "MODE FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to 

HAC-21, "CON-

SULT Function (HVAC)"

.

3. Observe "MODE FDBCK" voltage while cycling A/C auto amp. mode switch through all modes.

Is the inspection result normal?

YES

>> • Mode door motor is OK.

• Inspect mode door for mechanical failure. Refer to 

VTL-28, "Removal and Installation"

.

NO

>> GO TO 2.

2.

CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connector M49 and the mode door motor harness connector

M142.

3. Check continuity between A/C auto amp. harness connector M49 terminals 19, 20 and the mode door

motor harness connector M142 terminals 5, 6.

WJIA1084E

Monitor Item

Condition

Results

MODE FDBCK

Cycle mode switch through all modes, D/F 

(

), VENT (

), B/L (

), and FOOT(

)

Voltage varies between D/F (

) and VENT (

), and 

between VENT (

) and B/L (

).

August 2012

2012 Pathfinder

HAC-28

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR MOTOR

4. Check continuity between A/C auto amp. harness connector M49 terminals 19, 20 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 MODE DOOR MOTOR POWER AND GROUND 

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

2. Turn ignition switch ON.
3. Press the mode switch to the D/F (

) mode. 

4. Check voltage between A/C auto amp. harness connector M49 terminal 19 and terminal 20 while pressing

the mode switch to the VENT (

), and then the B/L (

) mode. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

4.

CHECK MODE DOOR MOTOR 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, and M50 terminal 28 and the

mode door motor harness connector M142 terminals 2, 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 7 and mode door motor har-

ness connector M142 terminal 4.

Connector

Terminal

Connector

Terminal

Continuity

M49

19

M142

6

Yes

20

1

Connector

Terminal

—

Continuity

M49

19

Ground

No

20

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M49

19

20

D/F (

) mode to VENT (

) mode

Battery voltage

20

19

VENT (

) mode to B/L (

) mode

Battery voltage

Connector

Terminal

Connector

Terminal

Continuity

M49

3

M142

2

Yes

M50 28

3

Connector

Terminal

—

Continuity

M49

3

Ground

No

M50

28

August 2012

2012 Pathfinder

MODE DOOR MOTOR

HAC-29

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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2. Check continuity between A/C auto amp. harness connector M49 terminal 7 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 M49 terminal 7 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 mode door motor harness connector M142.

2. Check voltage between A/C auto amp. harness connector M49 terminal 7 and ground.

Is the inspection result normal?

YES

>> Inspect mode door for binding or mechanical failure. If mode door moves freely, replace A/C auto

amp.. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Replace the mode door motor. Refer to 

VTL-28, "Removal and Installation"

.

Connector

Terminal

Connector

Terminal

Continuity

M49

7

M142

4

Yes

Connector

Terminal

—

Continuity

M49

7

Ground

No

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-) 

M50

28

M49

3

5V

Connector

Terminal

—

Voltage (Approx.)

M49

7

Ground

0V

Connector

Terminal

—

Voltage (Approx.)

M49

7

Ground

0.2 to 4.8V

August 2012

2012 Pathfinder

HAC-30

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

AIR MIX DOOR MOTOR

System Description

INFOID:0000000007356354

SYSTEM DESCRIPTION

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:

• A/C auto amp.

• A/C and AV switch assembly

• Air mix door motors (driver, passenger, and rear)

• PBR (built-into air mix door motors)

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• Intake sensor

System Operation

The A/C auto amp. receives data from the temperature selected by the driver side, passenger side, and rear.

The A/C auto amp. then applies a voltage to one circuit of the appropriate air mix door motor, while ground is

applied to the other circuit, causing the appropriate 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 A/C auto

amp. monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.

In AUTO mode the air mix, intake, mode door, and defrost door positions are set by the A/C auto amp. which

determines the proper position based on inputs from the in-vehicle sensor, ambient sensor, optical sensor,

intake sensor, and the temperature selected by the driver and front and rear passengers.

Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new

door position data is returned to the A/C auto amp.

AWIIA0106GB

August 2012

2012 Pathfinder

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:0000000007356355

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

August 2012

2012 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:0000000007356356

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, check "DVR MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to 

HAC-21,

"CONSULT 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

August 2012

2012 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

August 2012

2012 Pathfinder