Nissan Titan A60. Manual - part 588

INTAKE DOOR MOTOR

HAC-35

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

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F

G

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HAC

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INTAKE DOOR MOTOR

System Description

INFOID:0000000006164693

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:

• Front air control

• 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 front air control determines the intake door position based on the ambient tempera-

ture, the intake air temperature and the in-vehicle temperature. When the DEF, D/F, FOOT or OFF switches

are pushed, the front air control sets the intake door at the fresh position.

Intake Door Control Specification

COMPONENT DESCRIPTION

WJIA1915E

WJIA0436E

HAC-36

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE DOOR MOTOR

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 front air control. Motor rotation is

conveyed to a lever which activates the intake door.

Intake Door Motor Component Function Check

INFOID:0000000006164694

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 change slightly).
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-36, "Intake Door Motor Diagnosis Procedure"

.

Intake Door Motor Diagnosis Procedure

INFOID:0000000006708577

Regarding Wiring Diagram information, refer to 

HAC-71, "Wiring Diagram - Automatic Air Conditioner"

.

SYMPTOM:

• Intake door does not change.

• Intake door motor does not operate normally.

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

1.

CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the front air control harness connector M49 (A) and

the intake door motor harness connector M58 (B).

3. Check continuity between front air control harness connector

M49 (A) terminals 21, 22 and the intake door motor harness

connector M58 (B) terminals 1, 6.

WJIA0552E

A

B

Continuity

Connector

Terminal

Connector

Terminal

M49

21

M58

6

Yes

22

1

AWIIA0401ZZ

INTAKE DOOR MOTOR

HAC-37

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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HAC

N

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4. Check continuity between front air control harness connector

M49 terminals 21, 22 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness as necessary.

2.

CHECK FRONT AIR CONTROL FOR INTAKE AIR DOOR MOTOR POWER AND GROUND 

1. Reconnect front air control harness connector.

2. Turn ignition switch ON.

3. Check voltage between front air control 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-18, "Removal and Installation"

.

NO

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

Connector

Terminal

—

Continuity

M49

21

Ground

No

22

AWIIA0398ZZ

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M49

21

22

Self-diagnostic mode (opening)

Battery voltage

22

21

Self-diagnostic mode (closing)

Battery voltage

AWIIA0397ZZ

HAC-38

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DEFROSTER DOOR MOTOR CIRCUIT

DEFROSTER DOOR MOTOR CIRCUIT

System Description

INFOID:0000000006164696

SYSTEM DESCRIPTION

Component Parts

Defroster door control system components are:

• Front air control

• Defroster door motor

• PBR (Built into defroster door motor)

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• Intake sensor

System Operation

The front air control determines defroster door position based on the position of the defroster switch. When the

defroster switch is depressed, the defroster door motor rotates directing air to the defroster ducts. When any

mode other than defroster is selected, the defroster motor rotates in the opposite direction closing off air flow

to the defroster ducts.

In the AUTO mode, the front air control determines defroster door position based on the ambient temperature,

the intake air temperature and the in-vehicle temperature.

COMPONENT DESCRIPTION

Defroster door motor 

The defroster door motor is attached to the front heater & cooling

unit assembly. The front air control sends a voltage to rotate to the

defroster door directing the air flow either to the defroster ducts, or to

the foot ducts, depending on which way the voltage and ground are

applied to the motor leads. Motor rotation is conveyed to a lever

which activates the defroster door.

Defroster Door Motor Component Function Check

INFOID:0000000006164697

INSPECTION FLOW

WJIA1354E

WJIA0592E