Nissan Pathfinder (2009 year). Manual - part 454

MODE DOOR MOTOR

HAC-27

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

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:0000000003935888

INSPECTION FLOW

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR

Press mode switch four times and then press the

(DEF) switch. Each position indicator should change

shape (on display).

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

HAC-134, "Discharge

Air Flow"

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.

Can a symptom be duplicated?

YES

>> GO TO 3.

>> GO TO 2.

PERFORM COMPLETE OPERATIONAL CHECK

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

HAC-125, "Operational Check"

Can a symptom be duplicated?

YES

>> Refer to

HAC-124, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"

>> System OK.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

CHECK MODE DOOR OPERATION

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

Is the inspection result normal?

YES

>> GO TO 5.

>> Repair as necessary.

PERFORM A/C AUTO AMP. SELF-DIAGNOSIS

Perform self-diagnosis to check for any codes. Refer to

HAC-24, "A/C Auto Amp. Self-Diagnosis"

Are any self-diagnosis codes present?

YES

>> Refer to

HAC-25, "A/C System Self-Diagnosis Code Chart"

>> GO TO 6.

PERFORM A/C AND AV SWITCH ASSEMBLY SELF-DIAGNOSIS

Perform self-diagnosis to check the A/C and AV switch assembly. Refer to

HAC-24, "A/C and AV Switch

Assembly Self-Diagnosis"

Is the inspection result normal?

YES

>> Replace A/C and AV switch assembly. Refer to

VTL-7, "Removal and Installation"

>> GO TO 7.

WJIA1084E

2009 Pathfinder

HAC-28

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR MOTOR

CHECK THE MODE DOOR MOTOR (FRONT) PBR CIRCUIT

Perform diagnostic procedure for the mode door motor (front). Refer to

HAC-138, "Mode Door Motor (Front)

Component Function Check"

Is the inspection result normal?

YES

>> GO TO 8.

>> Repair PBR circuit or replace motor. Refer to

HAC-139, "Mode Door Motor (Front) Diagnosis Pro-

cedure"

RECHECK FOR CODES

Perform A/C auto amp. self-diagnosis. Refer to

HAC-24, "A/C Auto Amp. Self-Diagnosis"

Are any self-diagnostic codes present?

YES

>> Refer to

HAC-25, "A/C System Self-Diagnosis Code Chart"

>> GO TO 9.

RECHECK FOR SYMPTOMS

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

HAC-125, "Operational Check"

Does another symptom exist?

YES

>> Repair as necessary.

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and Installation"

Mode Door Motor (Front) Diagnosis Procedure

INFOID:0000000003935889

SYMPTOM:

• Air outlet does not change.
• Mode door motor does not operate normally.

CHECK A/C AUTO AMP. FOR POWER AND GROUND

Turn ignition switch ON.

Press the mode switch to the B/L (

) mode.

Check voltage between A/C auto amp. harness connector M49
terminal 19 and terminal 20 while pressing the mode switch to
the floor (

) mode.

Is the inspection result normal?

YES

>> GO TO 3.

>> GO TO 2.

CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND

Turn ignition switch OFF.

Disconnect the A/C auto amp. harness connector.

Check continuity between A/C auto amp. harness connector
M49 terminal 19, 20 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and

Installation"

>> Repair or replace harness as necessary.

Connector

Terminals

Condition

Voltage

(Approx.)

(+) (-)

A/C auto amp.:

M49

Press
mode

switch

Battery
voltage

AWIIA0095ZZ

19 - Ground

: Continuity should not exist.

20 - Ground

: Continuity should not exist.

AWIIA0096ZZ

2009 Pathfinder

MODE DOOR MOTOR

HAC-29

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

CHECK A/C AUTO AMP. FOR GROUND AND POWER

Press the mode switch to the D/F (

) mode.

Check voltage between A/C auto amp. harness connector M49
terminal 19 and terminal 20 while pressing the mode switch to
the vent (

) mode.

Is the inspection result normal?

YES

>> GO TO 4.

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and Installation"

CHECK MODE DOOR MOTOR AND CIRCUITS FOR OPEN

Turn ignition switch OFF.

Disconnect the A/C auto amp. harness connector.

Check continuity between A/C auto amp. harness connector
M49 terminal 19 and terminal 20.

Is the inspection result normal?

YES

>> GO TO 6.

>> GO TO 5.

CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN

Disconnect the mode door motor harness connector.

Check continuity between A/C auto amp. harness connector
M49 (A) terminal 19, 20 and the mode door motor harness con-
nector M142 (B) terminal 1, 6.

Is the inspection result normal?

YES

>> Replace mode door motor. Refer to

VTL-28, "Removal

and Installation"

>> Repair or replace harness as necessary.

CHECK A/C AUTO AMP. FOR PBR POWER AND GROUND

Reconnect A/C auto amp. harness connector.

Turn ignition switch ON.

Check voltage between A/C auto amp. harness connector M50
(A) terminal 28 and M49 (B) terminal 3.

Is the inspection result normal?

YES

>> GO TO 8.

>> GO TO 7.

CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND

Connector

Terminals

Condition

Voltage

(Approx.)

(+) (-)

A/C auto amp.:

M49

19 20

Press
mode

switch

Battery
voltage

AWIIA0097ZZ

Continuity should exist.

AWIIA0098ZZ

6 - 19

: Continuity should exist.

1 - 20

: Continuity should exist.

AWIIA0225ZZ

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

A/C auto amp.: M49, M50

AWIIA0099ZZ

2009 Pathfinder

HAC-30

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR MOTOR

Turn ignition switch OFF.

Disconnect the A/C auto amp. harness connector.

Check continuity between A/C auto amp. harness connector
M50 terminal 28 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and

Installation"

>> Repair or replace harness as necessary.

CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS

Turn ignition switch OFF.

Disconnect the A/C auto amp. harness connector.

Check continuity between A/C auto amp. harness connector
M50 (A) terminal 28 and M49 (B) terminal 3.

Is the inspection result normal?

YES

>> GO TO 10.

>> GO TO 9

CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN

Disconnect the mode door motor harness connector.

Check continuity between mode door motor harness connector
M142 (B) terminal 3, 1 and A/C auto amp. harness connector
M49 (C) terminal 3, M50 (A) terminal 28.

Is the inspection result normal?

YES

>> Replace mode door motor. Refer to

VTL-28, "Removal

and Installation"

>> Repair or replace harness as necessary.

10.

CHECK PBR FEEDBACK VOLTAGE

Reconnect the A/C auto amp. harness connector.

Turn ignition switch ON.

Check voltage between A/C auto amp. harness connector M49
terminal 7 and ground while cycling mode switch through all
modes.

Is the inspection result normal?

YES

>> GO TO 12.

>> GO TO 11.

11.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND

Continuity should not exist.

AWIIA0100ZZ

Continuity should exist.

AWIIA0101ZZ

28 - 3

: Continuity should exist.

3 - 2

: Continuity should exist.

AWIIA0393ZZ

Voltage

: Approx. 1V - 4.5V

AWIIA0103ZZ

2009 Pathfinder

MODE DOOR MOTOR

HAC-31

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

Turn ignition switch OFF.

Disconnect A/C auto amp. harness connector.

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

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and

Installation"

>> Repair or replace harness as necessary.

12.

CHECK PBR FEEDBACK CIRCUIT FOR OPEN

Turn ignition switch OFF.

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

Check continuity between mode door motor harness connector
M142 (B) terminal 4 and A/C auto amp. harness connector M49
(A) terminal 7.

Is the inspection result normal?

YES

>> Replace mode door motor. Refer to

VTL-28, "Removal

and Installation"

>> Repair or replace harness as necessary.

Continuity should not exist.

AWIIA0104ZZ

Continuity should exist.

AWIIA0227ZZ

2009 Pathfinder

HAC-32

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

AIR MIX DOOR MOTOR

System Description

INFOID:0000000003935890

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

2009 Pathfinder

AIR MIX DOOR MOTOR

HAC-33

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

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 Component Function Check

INFOID:0000000003935891

INSPECTION FLOW

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

Turn the temperature control dial (driver) clockwise until 32

C (90

F) is displayed.

Check for hot air at discharge air outlets.

AWIIA0107GB

WJIA1978E

WJIA1979E

WJIA1245E