Nissan Frontier D40. Manual - part 731

AIR MIX DOOR MOTOR

HAC-27

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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1.

Reconnect front air control harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M50
terminal 23 and terminal 1.

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 front air control harness connector.

3.

Check continuity between front air control harness connector
M50 terminal 23 and ground.

Is the inspection result normal?

YES

>> Replace front air control. 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 front air control harness connector.

3.

Check continuity between front air control harness connector
M50 terminal 23 and terminal 1.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 9.

9.

CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN

1.

Disconnect the air mix door motor harness connector.

2.

Check continuity between air mix door motor harness connector
M148 (B) terminal 3, 1 and front air control harness connector
M50 (A) terminal 3 and terminal 23.

Is the inspection result normal?

YES

>> Replace air mix door motor. Refer to 

VTL-19, "Removal

and Installation"

.

NO

>> Repair or replace harness as necessary.

10.

CHECK PBR FEEDBACK VOLTAGE

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

Front air control: M50

23 

1

5V

AWIIA1223ZZ

Continuity should not exist.

AWIIA1202ZZ

Continuity should exist.

AWIIA1224ZZ

23 - 1

: Continuity should exist.

3 - 3

: Continuity should exist.

AWIIA1207ZZ

HAC-28

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

AIR MIX DOOR MOTOR

1.

Reconnect the front air control harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M50
terminal 6 and ground while rotating temperature control dial
from maximum hot to maximum cold.

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 front air control harness connector.

3.

Check continuity between front air control harness connector
M50 terminal 6 and ground.

Is the inspection result normal?

YES

>> Replace front air control. 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 harness connector and front
air control harness connector.

3.

Check continuity between air mix door motor harness connector
M148 (B) terminal 2 and front air control harness connector M50
(A) terminal 6.

Is the inspection result normal?

YES

>> Replace air mix door motor. Refer to 

VTL-19, "Removal

and Installation"

.

NO

>> Repair or replace harness as necessary.

 Voltage

: Approx. 0.5V - 4.5V

AWIIA0382ZZ

Continuity should not exist.

AWIIA0383ZZ

Continuity should exist.

AWIIA1208ZZ

INTAKE DOOR MOTOR

HAC-29

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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INTAKE DOOR MOTOR

System Description

INFOID:0000000005275881

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

INFOID:0000000005275882

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 any speed.

WJIA1478E

WJIA1486E

HAC-30

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

INTAKE DOOR MOTOR

2.

Press vent mode (

) switch.

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-30, "Intake Door Motor Diagnosis Procedure"

.

Intake Door Motor Diagnosis Procedure

INFOID:0000000005275883

Regarding Wiring Diagram information, refer to 

HAC-50, "Wiring Diagram - Air Conditioner Control - With

VBC"

.

SYMPTOM:

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

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

1.

CHECK FRONT AIR CONTROL FOR POWER AND GROUND 

1.

Turn ignition switch ON.

2.

Check voltage between front air control harness connector M50
terminal 21 and terminal 22 while placing the front air control
into self-diagnostic mode. Refer to 

HAC-17, "Front Air Control

Self-Diagnosis"

.

Is the inspection result normal?

YES

>> 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 front air control harness connector.

3.

Check continuity between front air control harness connector
M50 terminal 21, 22 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

3.

CHECK FRONT AIR CONTROL FOR GROUND AND POWER 

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

Front air control: 

M50

21

22

Self-diagnostic 

mode

Battery volt-

age

AWIIA0397ZZ

21 - Ground

: Continuity should not exist.

22 - Ground

: Continuity should not exist.

AWIIA0398ZZ