Nissan Pathfinder (2009 year). Instruction - part 456

INTAKE DOOR MOTOR

HAC-43

< 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:0000000003935895

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

>> GO TO 3.

NO

>> GO TO 2.

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"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

CHECK INTAKE DOOR OPERATION

Check and verify intake door mechanism for smooth operation. 
Is the inspection result normal?

YES

>> GO TO 5. 

NO

>> Repair intake door mechanism.

5.

PERFORM 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"

.

NO

>> GO TO 6.

6.

RECHECK FOR ANY SYMPTOMS 

Perform a complete operational check for any symptoms. Refer to 

HAC-125, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to 

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

. 

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

WJIA1107E

2009 Pathfinder

HAC-44

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE DOOR MOTOR

Intake Door Motor Diagnosis Procedure

INFOID:0000000003935896

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 

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

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M49

21

22

Self-diagnostic 

mode

Battery volt-

age

AWIIA0146ZZ

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

2009 Pathfinder

INTAKE DOOR MOTOR

HAC-45

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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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.

Continuity should exist.

AWIIA0149ZZ

21 - 6

: Continuity should exist.

22 - 1

: Continuity should exist.

AWIIA0234ZZ

2009 Pathfinder

HAC-46

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

BLOWER MOTOR CONTROL SYSTEM

System Description

INFOID:0000000003935897

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 instruction 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

2009 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-47

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Blower Speed Compensation - Sunload

When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The speed will vary depending on the sunload. During conditions of low or no sunload, the blower
operates at low speed. During high sunload conditions, the A/C auto amp. causes the blower speed to
increase.

Blower Speed Control Specification

COMPONENT DESCRIPTION

Variable Blower Control

The variable blower control is located on the cooling unit. The vari-
able blower control receives a gate voltage from the A/C auto amp.
to steplessly maintain the blower motor voltage in the 0 to 5 volt
range (approx.).

Front Blower Motor Component Function Check

INFOID:0000000003935898

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER MOTOR

1.

Press the blower (+) switch. Blower should operate.

2.

Rotate the front blower control dial clockwise, and continue checking blower speed and fan symbol until
all speeds are checked.

Can the symptom be duplicated?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FOR ANY SYMPTOMS 

Perform a complete operational check for any symptoms. Refer to 

HAC-125, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to 

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

. 

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

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?

WJIA0441E

WJIA1111E

2009 Pathfinder

HAC-48

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

YES

>> Refer to 

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

.

NO

>> GO TO 5.

5.

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 results normal?

YES

>> GO TO 6. 

NO

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

VTL-7, "Removal and Installation"

.

6.

CHECK BLOWER MOTOR OPERATION

Check and verify blower motor operates instructionly in all speeds.

Does blower motor operate in all speeds?

YES

>> GO TO 7.

NO

>> Refer to 

HAC-150, "Front Blower Motor Diagnosis Procedure"

.

7.

CHECK ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT

Check engine coolant temperature sensor circuit. Refer to 

EC-128, "Component Description"

 (VQ40DE) or

EC-607, "Component Inspection"

 (VK56DE).

Is the inspection results normal?

YES

>> GO TO 8.

NO

>> Replace engine coolant temperature sensor.

8.

RECHECK FOR ANY SYMPTOMS 

Perform a complete operational check for any symptoms. Refer to 

HAC-125, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to 

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

. 

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

Front Blower Motor Diagnosis Procedure

INFOID:0000000003935899

SYMPTOM: Blower motor operation is malfunctioning.

DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR

SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.

1.

CHECK FUSES

AWIIA0242ZZ

2009 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-49

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Check 15A fuses [No. 24 and 27 (Located in the fuse and fusible link box)].

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 8.

2.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT 

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor connector.

3.

Turn ignition switch ON.

4.

Press the A/C switch.

5.

Press the front blower control "+" switch to maximum speed.

6.

Check voltage between front blower motor harness connector
M62 terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 3.

3.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor relay.

3.

Check voltage between front blower motor relay harness con-
nector E22 terminals 5, 7 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK FRONT BLOWER MOTOR RELAY

Turn ignition switch OFF.
Check front blower motor relay. Refer to 

HAC-154, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace front blower motor relay.

5.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN

Check continuity between front blower motor relay harness connec-
tor E22 terminals 3, 6 and front blower motor harness connector
M62 terminal 2.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN

Fuses are good.

2 - Ground

: Battery voltage

WJIA1331E

5 - Ground

: Battery voltage

7 - Ground

: Battery voltage

WJIA1634E

3, 6 - 2

: Continuity should exist.

WJIA1333E

2009 Pathfinder

HAC-50

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

1.

Disconnect variable blower control harness connector.

2.

Check continuity between front blower motor relay harness con-
nector E22 (A) terminals 3, 6 and variable blower control har-
ness connector M122 (B) terminal 4.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY

1.

Turn ignition switch ON.

2.

Check voltage between front blower motor relay harness con-
nector E22 terminal 1 and ground.

Is the inspection result normal?

YES

>> Repair front blower motor ground circuit or connector.

NO

>> Repair harness or connector.

8.

REPLACE FUSES

Replace fuses.

Does the fuse blow?

YES

>> • If fuse blows without activating the front blower motor, repair short between fuse and front

blower motor relay.

• If fuse blows activating the front blower motor, GO TO 9.

NO

>> Inspection End.

9.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor connector, front blower motor
relay and variable blower control connector.

3.

Check continuity between variable blower control harness con-
nector M122 terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair harness or connector.

10.

CHECK FRONT BLOWER MOTOR

Check front blower motor. Refer to 

HAC-154, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> Replace variable blower control (front). Refer to 

VTL-14, "Removal and Installation"

.

NO

>> Replace front blower motor. Refer to 

VTL-12, "Removal and Installation"

.

11.

CHECK FRONT BLOWER MOTOR

Check front blower motor. Refer to 

HAC-52, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace front blower motor. Refer to 

VTL-12, "Removal and Installation"

.

12.

CHECK BLOWER MOTOR GROUND CIRCUIT

3, 6 - 4

: Continuity should exist.

AWIIA0243ZZ

1 - Ground

: Battery voltage

WJIA0504E

4 - Ground

: Continuity should not exist.

AWIIA0177ZZ

2009 Pathfinder