Nissan Pathfinder (2010 year). Manual - part 445

HAC-36

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. harness connector.

3. Check continuity between A/C auto amp. harness connector

M49 terminal 6 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

12.

CHECK PBR FEEDBACK CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect the air mix door motor (driver) harness connector

and A/C auto amp. harness connector.

3. Check continuity between air mix door motor (driver) harness

connector M147 (B) terminal 2 and A/C auto amp. harness con-

nector M49 (A) terminal 6.

Is the inspection result normal?

YES

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

VTL-30,

"Removal and Installation"

.

NO

>> Repair or replace harness as necessary.

Air Mix Door Motor (Passenger) Component Function Check

INFOID:0000000005476024

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.
Can a symptom be duplicated?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-41, "Intake Door Motor Diagnosis Procedure"

.

Air Mix Door Motor (Passenger) Diagnosis Procedure

INFOID:0000000005256923

Regarding Wiring Diagram information, refer to 

HAC-90, "Wiring Diagram"

.

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (PASSENGER)

1.

CHECK A/C AUTO AMP. FOR POWER AND GROUND 

Continuity should not exist.

AWIIA0123ZZ

Continuity should exist.

AWIIA0230ZZ

2010 Pathfinder

AIR MIX DOOR MOTOR

HAC-37

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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1. Turn ignition switch ON.

2. Rotate temperature control dial (passenger) to 32

°

C (90

°

F).

3. Check voltage between A/C auto amp. harness connector M49

terminal 14 and terminal 2 while rotating temperature control dial

(passenger) to 18

°

C (60

°

F).

Is the inspection result normal?

OK

>> GO TO 3.

NG

>> GO TO 2.

2.

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

1. Turn ignition switch OFF.

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

3. Check continuity between A/C auto amp. harness connector

M49 terminal 14, 2 and ground.

Is the inspection result normal?

YES  >> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

3.

CHECK A/C AUTO AMP. FOR POWER AND GROUND 

1. Turn ignition switch ON.

2. Rotate temperature control dial (passenger) to 18

°

C (60

°

F).

3. Check voltage between A/C auto amp. harness connector M49

terminal 14 and terminal 2 while rotating temperature control dial

(passenger) 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 (PASSENGER) CIRCUITS FOR OPEN

1. Turn ignition switch OFF.

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

3. Check continuity between A/C auto amp. harness connector

M50 terminal 14 and terminal 2.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK AIR MIX DOOR MOTOR (PASSENGER) CIRCUITS FOR OPEN 

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M49

2 14

Rotate temp 

control dial

Battery 
voltage

AWIIA0125ZZ

14 - Ground

: Continuity should not exist.

2 - Ground

: Continuity should not exist.

AWIIA0126ZZ

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M49

14 2

Rotate temp 

control dial

Battery 
voltage

AWIIA0127ZZ

Continuity should exist.

AWIIA0128ZZ

2010 Pathfinder

HAC-38

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

1. Disconnect the air mix door motor (passenger) harness connec-

tor.

2. Check continuity between A/C auto amp. harness connector

M49 (A) terminal 14, 2 and the air mix door motor (passenger)

harness connector M143 (B) terminal 5, 6.

Is the inspection result normal?

YES

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

VTL-

30, "Removal and Installation"

.

NO

>> Repair or replace harness as necessary.

6.

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

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

2. Turn ignition switch ON.

3. 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.

NO

>> GO TO 7.

7.

CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND

1. Turn ignition switch OFF.

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

3. Check continuity between A/C auto amp. harness connector

M49 terminal 29 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

8.

CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS

1. Turn ignition switch OFF.

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

3. 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.

NO

>> GO TO 9.

9.

CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN

14 - 6

: Continuity should exist.

2 - 5

: Continuity should exist.

AWIIA0231ZZ

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

A/C auto amp.: M49

28 

3

5V

AWIIA0099ZZ

Continuity should not exist.

AWIIA0241ZZ

Continuity should exist.

AWIIA0101ZZ

2010 Pathfinder

AIR MIX DOOR MOTOR

HAC-39

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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G

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HAC

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1. Disconnect the air mix door motor (passenger) harness connec-

tor.

2. Check continuity between air mix door motor (passenger) har-

ness connector M143 (B) terminal 3, 1 and A/C auto amp. har-

ness connector M49 (C) terminal 3 and M50 (A) terminal 28.

Is the inspection result normal?

YES

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

VTL-

30, "Removal and Installation"

.

NO

>> Repair or replace harness as necessary.

10.

CHECK PBR FEEDBACK VOLTAGE

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

2. Turn ignition switch ON.

3. Check voltage between A/C auto amp. harness connector M50

terminal 29 and ground while rotating temperature control dial

(passenger) from 32

°

C (90

°

F) to 18

°

C (60

°

F).

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 11.

11.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. harness connector.

3. Check continuity between A/C auto amp. harness connector

M50 terminal 29 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

12.

CHECK PBR FEEDBACK CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect the air mix door motor (passenger) harness connec-

tor and A/C auto amp. harness connector.

3. Check continuity between air mix door motor (passenger) har-

ness connector M143 (B) terminal 2 and A/C auto amp. harness

connector M50 (A) terminal 29.

Is the inspection result normal?

YES

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

VTL-

30, "Removal and Installation"

.

NO

>> Repair or replace harness as necessary.

28 - 1

: Continuity should exist.

3 - 3

: Continuity should exist.

AWIIA0368ZZ

 Voltage

: Approx. .5V - 4.5V

AWIIA0131ZZ

Continuity should not exist.

AWIIA0132ZZ

Continuity should exist.

AWIIA0233ZZ

2010 Pathfinder

HAC-40

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE DOOR MOTOR

INTAKE DOOR MOTOR

System Description

INFOID:0000000005256924

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, FLOOR or OFF switches are

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

Intake Door Control Specification

AWIIA0144GB

AWIIA0145GB

2010 Pathfinder

INTAKE DOOR MOTOR

HAC-41

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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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 A/C auto amp. Motor rotation is

conveyed to a lever which activates the intake door.

Intake Door Motor Component Function Check

INFOID:0000000005256925

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (

)

1. Press the mode switch to vent mode(

).

2. Press REC (

) switch. The REC (

)indicator should illuminate.

3. Press REC (

) switch again. The REC (

) indicator should go out.

4. Listen for intake door position change (you should hear blower sound changes slightly).
Can a symptom be duplicated?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-83, "Intake Sensor Diagnosis Procedure"

.

Intake Door Motor Diagnosis Procedure

INFOID:0000000005256926

Regarding Wiring Diagram information, refer to 

HAC-90, "Wiring Diagram"

.

SYMPTOM:

• Intake door does not change.

• Intake door motor does not operate normally.

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

1.

CHECK A/C AUTO AMP. FOR POWER AND GROUND 

1. Turn ignition switch ON.

2. Check voltage between A/C auto amp. harness connector M49

terminal 21 and terminal 22 while placing the HVAC system into

self-diagnostic mode.

Is the inspection result normal?

OK

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK INTAKE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND 

WJIA1107E

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M49

21

22

Self-diagnostic 

mode

Battery volt-

age

AWIIA0146ZZ

2010 Pathfinder

HAC-42

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE DOOR MOTOR

1. Turn ignition switch OFF.

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

3. Check continuity between A/C auto amp. harness connector

M49 terminal 21, 22 and ground.

Is the inspection result normal?

OK

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

3.

CHECK A/C AUTO AMP. FOR GROUND AND POWER 

1. Press the BACK button to back out of self-diagnostic mode.

2. Check voltage between A/C auto amp. harness connector M49

terminal 21 and terminal 22 while placing the HVAC system into

self-diagnostic mode.

Is the inspection result normal?

OK

>> GO TO 4.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

4.

CHECK INTAKE DOOR MOTOR AND CIRCUITS FOR OPEN

1. Turn ignition switch OFF.

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

3. Check continuity between A/C auto amp. harness connector

M49 terminal 21 and terminal 22.

Is the inspection result normal?

OK

>> Replace intake door motor. Refer to 

VTL-27, "Removal

and Installation"

.

NO

>> GO TO 5.

5.

CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN 

1. Disconnect the intake door motor harness connector.

2. Check continuity between A/C auto amp. harness connector

M49 (A) terminal 21, 22 and the intake door motor harness con-

nector M58 (B) terminal 1, 6.

Is the inspection result normal?

YES

>> Replace intake door motor. Refer to 

VTL-27, "Removal

and Installation"

.

NO

>> Repair or replace harness as necessary.

21 - Ground

: Continuity should not exist.

22 - Ground

: Continuity should not exist.

AWIIA0147ZZ

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M49

22 21

Self-diagnostic 

mode

Battery 
voltage

AWIIA0148ZZ

Continuity should exist.

AWIIA0149ZZ

21 - 6

: Continuity should exist.

22 - 1

: Continuity should exist.

AWIIA0234ZZ

2010 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-43

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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BLOWER MOTOR CONTROL SYSTEM

System Description

INFOID:0000000005256927

SYSTEM DESCRIPTION

Component Parts

Blower speed control system components are:

• A/C auto amp.

• A/C and AV switch assembly

• Variable blower control

• Front blower motor relay

• Front blower motor

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• Intake sensor

System Operation

Automatic Mode

In the automatic mode, the blower motor speed is calculated by the A/C auto amp. and variable blower control

based on input from the in-vehicle sensor, optical sensor, intake sensor and ambient sensor, and potentio tem-

perature control (PTC). 

When the air flow is increased, the blower motor speed is adjusted gradually to prevent a sudden increase in

air flow.

In addition to manual air flow control and the usual automatic air flow control, starting air flow control, low

water temperature starting control and high passenger compartment temperature starting control are avail-

able.

Starting Blower Speed Control

Start up from cold soak condition (Automatic mode).

In a cold start up condition where the engine coolant temperature is below 50

°

C (122

°

F), the blower will not

operate at blower speed 1 for a short period of time (up to 210 seconds). The exact start delay time varies

depending on the ambient and engine coolant temperatures.

In the most extreme case (very low ambient temperature) the blower starting delay will be 210 seconds as

described above. After the coolant temperature reaches 50

°

C (122

°

F), or the 210 seconds has elapsed, the

blower speed will increase to the objective blower speed.

Start up from usual operating or hot soak condition (Automatic mode).

The blower will begin operation momentarily after the AUTO switch is pushed. The blower speed will gradually

rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective

blower speed).

AWIIA0173GB

2010 Pathfinder