Nissan Pathfinder (2011 year). Instruction — part 447

INTAKE DOOR MOTOR

HAC-39

< DTC/CIRCUIT 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:0000000006243641

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).
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to

HAC-87, "Intake Sensor Diagnosis Procedure"

.

Intake Door Motor Diagnosis Procedure

INFOID:0000000006243642

Regarding Wiring Diagram information, refer to

HAC-95, "Wiring Diagram - Automatic"

.

SYMPTOM:

• Intake door does not change.

• Intake door motor does not operate normally.

1.

CHECK INTAKE 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 intake door motor harness connector M58.

3. Check continuity between A/C auto amp. harness connector M49 terminals 21, 22 and the intake door

motor harness connector M58 terminals 1, 6.

4. Check continuity between A/C auto amp. harness connector M49 terminals 21, 22 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness as necessary.

2.

CHECK A/C AUTO AMP. FOR INTAKE AIR DOOR MOTOR POWER AND GROUND

WJIA1107E

Connector

Terminal

Connector

Terminal

Continuity

M49

21

M58

6

Yes

22

1

Connector

Terminal

—

Continuity

M49

21

Ground

No

22

2011 Pathfinder

HAC-40

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE DOOR MOTOR

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

2. Turn ignition switch ON.

3. 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?

YES

>> Inspect intake air door for binding or mechanical failure. If intake air door moves freely, replace the

intake air door motor. Refer to

VTL-26, "Removal and Installation"

.

NO

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and Installation"

.

Connector

Terminals

Condition Voltage

(Approx.)

(+) (-)

M49

21

22

Self-diagnostic mode (opening)

Battery voltage

22

21

Self-diagnostic mode (closing)

Battery voltage

2011 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-41

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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BLOWER MOTOR CONTROL SYSTEM

System Description

INFOID:0000000006243643

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

2011 Pathfinder

HAC-42

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

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:0000000006243644

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER MOTOR

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

2. Press the blower (+) switch and continue checking blower speed and fan symbol until all speeds are

checked.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to

HAC-42, "Front Blower Motor Diagnosis Procedure"

.

Front Blower Motor Diagnosis Procedure

INFOID:0000000006243645

Regarding Wiring Diagram information, refer to

HAC-95, "Wiring Diagram - Automatic"

.

SYMPTOM: Blower motor operation is malfunctioning.

DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR

WJIA0441E

WJIA1111E

2011 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-43

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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SYMPTOM: Blower motor operation is malfunctioning under starting

blower speed control.

1.

CHECK FUSES

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.

AWIIA0242ZZ

Fuses are good.

2 - Ground

: Battery voltage

WJIA1331E

5 - Ground

: Battery voltage

7 - Ground

: Battery voltage

WJIA1634E

2011 Pathfinder

HAC-44

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

4.

CHECK FRONT BLOWER MOTOR RELAY

Turn ignition switch OFF.

Check front blower motor relay. Refer to

HAC-46, "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

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

3, 6 - 2

: Continuity should exist.

WJIA1333E

3, 6 - 4

: Continuity should exist.

AWIIA0243ZZ

1 - Ground

: Battery voltage

WJIA0504E

2011 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-45

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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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-46, "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-46, "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

1. Disconnect variable blower control (front) connector.

2. Check continuity between front blower motor harness connector

M62 (B) terminal 1 and variable blower control harness connec-

tor M122 (A) terminal 2.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair harness or connector.

13.

CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN

1. Disconnect front blower motor relay.

2. Check continuity between front blower motor relay harness con-

nector E22 (A) terminals 3, 5 and variable blower control har-

ness connector M122 (B) terminal 4.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Repair harness or connector.

14.

CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT

4 - Ground

: Continuity should not exist.

AWIIA0177ZZ

1 - 2

: Continuity should exist.

AWIIA0179ZZ

3 - 4

: Continuity should exist.

AWIIA0243ZZ

2011 Pathfinder

HAC-46

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

Check continuity between variable blower control harness connector

M122 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Repair harness or connector.

15.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT

1. Reconnect all disconnected component connectors.

2. Disconnect A/C auto amp. connector.

3. Turn ignition switch ON.

4. Press the blower (+) switch to maximum speed.

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

terminal 13 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and

Installation"

NO

>> GO TO 16.

16.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT FOR OPEN

1. Disconnect variable blower control connector.

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

M49 (B) terminal 13 and variable blower control harness con-

nector M122 (A) terminal 3.

Is the inspection result normal?

YES

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

VTL-14,

"Removal and Installation"

.

NO

>> Repair harness or connector.

Front Blower Motor Component Inspection

INFOID:0000000006243646

COMPONENT INSPECTION

Front Blower Motor Relay

1 - Ground

: Continuity should exist.

AWIIA0180ZZ

13 - Ground

: Approx. 4.5V

AWIIA1129ZZ

13 - 3

: Continuity should exist.

AWIIA0178ZZ

2011 Pathfinder