Nissan Frontier D40. Manual - part 748

INTAKE DOOR MOTOR

HAC-95

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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INTAKE DOOR MOTOR

System Description

INFOID:0000000005275931

SYSTEM DESCRIPTION

Component Parts

Intake door control system components are:

• Front air control
• Intake door motor
• 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.

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 front air control. Motor rotation is
conveyed to a lever which activates the intake door.

Intake Door Motor Component Function Check

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SYMPTOM:

• Intake door does not change.
• Intake door motor does not operate normally.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (

)

1.

Turn blower control dial to 4.

WJIA1478E

WJIA1486E

HAC-96

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

INTAKE DOOR MOTOR

2.

Turn mode dial to vent mode (

).

3.

Press REC (

) switch. 

4.

Press REC (

) switch again.

5.

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-96, "Intake Door Motor Diagnosis Procedure"

.

Intake Door Motor Diagnosis Procedure

INFOID:0000000005275933

Regarding Wiring Diagram information, refer to 

HAC-117, "Wiring Diagram - Air Conditioner Control - Without

VBC"

.

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

1.

CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE

1.

Turn ignition switch OFF.

2.

Disconnect intake door motor connector.

3.

Turn ignition switch ON.

4.

Rotate the temperature control dial counterclockwise.

5.

Check voltage between intake door motor harness connector
M58 terminal 6 and ground.

Is inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector.

3.

Check continuity between front air control harness connector
M49 terminal 5 and intake door motor harness connector M58
terminal 6.

Is inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

3.

CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE

1.

Rotate the temperature control dial clockwise.

2.

Check voltage between intake door motor harness connector
M58 terminal 1 and ground.

Is inspection result normal?

YES

>> Replace intake door motor. Refer to 

VTL-17, "Removal

and Installation"

.

NO

>> GO TO 4.

4.

CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN

6 - Ground

: Battery voltage

WJIA1324E

5 - 6

: Continuity should exist.

WJIA1468E

1 - Ground

:Battery voltage

WJIA1326E

INTAKE DOOR MOTOR

HAC-97

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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1.

Turn ignition switch OFF.

2.

Disconnect front air control connector.

3.

Check continuity between front air control harness connector
M49 (A) terminal 4 and intake door motor harness connector
M58 (B) terminal 1.

Is inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair or replace harness as necessary.

A

B

Connector

Terminal Connector

Terminal 

Continuity

Front air control: 

M49

4 

Intake door motor: 

M58

1

Yes

WJIA1684E

HAC-98

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

BLOWER MOTOR

BLOWER MOTOR

System Description

INFOID:0000000005275934

Component Parts

Blower speed control system components are:

• Front air control
• Front blower motor resistor
• Front blower motor
• Front blower relay
• Front blower switch

System Operation

COMPONENT DESCRIPTION

Blower Motor Resistor

The front blower motor resistor (1) is located on the heater and cool-
ing unit assembly. The front blower motor resistor grounds the front
blower motor through a series of 1, 2, or 3 resistors, depending upon
speed selected. For high speed operation the front blower motor
resistor is circumvented and the front blower motor grounds directly.

Front Blower Motor Component Function Check

INFOID:0000000005275935

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER

1.

Rotate the blower control dial clockwise. Blower should operate.

2.

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

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-99, "Front Blower Motor Diagnosis Procedure"

.

AWIIA0272GB

AWIIA1196ZZ