Nissan Frontier D40. Manual - part 730

MODE DOOR MOTOR

HAC-23

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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HAC

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1.

Turn ignition switch OFF.

2.

Disconnect front air control harness connector.

3.

Check continuity between front air control harness connector
M50 terminal 7 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 mode door motor harness connector and front
air control harness connector.

3.

Check continuity between mode door motor harness connector
M142 (B) terminal 4 and front air control harness connector M50
(A) terminal 7.

Is the inspection result normal?

YES

>> Replace mode door motor. Refer to 

VTL-18, "Removal

and Installation"

.

NO

>> Repair or replace harness as necessary.

Continuity should not exist.

AWIIA0370ZZ

Continuity should exist.

AWIIA1205ZZ

HAC-24

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

AIR MIX DOOR MOTOR

AIR MIX DOOR MOTOR

System Description

INFOID:0000000005275878

SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:

• Front air control
• Air mix door motor 
• PBR (built into air mix door motor)
• Intake sensor

System Operation

The front air control receives data from the temperature selected by the driver. The front air control then
applies a voltage to one circuit of the air mix door motor, while ground is applied to the other circuit, causing
the air mix door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to
it, and which one has ground applied to it. The front air control monitors the air mix door positions by measur-
ing the voltage signal on the PBR circuits of each door.

Air Mix Door Control Specification

COMPONENT DESCRIPTION

Air Mix Door Motor

WJIA1316E

WJIA0435E

AIR MIX DOOR MOTOR

HAC-25

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

The air mix door motor is attached to the heater and cooling unit
assembly. This motor rotates so that the air mix door is opened or
closed to a position set by the front air control. Motor rotation is then
conveyed through a shaft and the air mix door position is then fed
back to the front air control by the PBR built into the air mix door
motor.

Air Mix Door Motor Component Function Check

INFOID:0000000005275879

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1.

Blower must be ON.

2.

Turn the temperature control dial clockwise to maximum heat.

3.

Check for hot air at discharge air outlets.

>> GO TO 2.

2.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE

1.

Turn the temperature control dial counterclockwise to maximum cold.

2.

Check for cold air at discharge air outlets.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-25, "Air Mix Door Motor Diagnosis Procedure"

.

Air Mix Door Motor Diagnosis Procedure

INFOID:0000000005275880

Regarding Wiring Diagram information, refer to 

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

VBC"

.

SYMPTOM:

• Discharge air temperature does not change.
• Air mix door motor does not operate.

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR

1.

CHECK FRONT AIR CONTROL FOR POWER AND GROUND 

1.

Turn ignition switch ON.

2.

Rotate temperature control dial to maximum hot.

3.

Check voltage between front air control harness connector M50
terminal 17 and terminal 18 while rotating temperature control
dial to maximum cold.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK AIR MIX DOOR MOTOR CIRCUITS FOR SHORT TO GROUND 

WJIA1636E

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

Front air control: 

M50

17 18

Rotate temp 

control dial

Battery 
voltage

AWIIA0373ZZ

HAC-26

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

AIR MIX DOOR MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect the front air control harness connector.

3.

Check continuity between front air control harness connector
M50 terminal 17, 18 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 POWER AND GROUND 

1.

Rotate temperature control dial to maximum hot.

2.

Check voltage between front air control harness connector M50
terminal 17 and terminal 18 while rotating temperature control
dial to maximum cold.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

4.

CHECK AIR MIX DOOR MOTOR CIRCUITS FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect the front air control harness connector.

3.

Check continuity between front air control harness connector
M50 terminal 17 and terminal 18.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK AIR MIX DOOR MOTOR CIRCUITS FOR OPEN 

1.

Disconnect the air mix door motor harness connector.

2.

Check continuity between front air control harness connector
M50 (A) terminal 17, 18 and the air mix door motor harness con-
nector M148 (B) terminal 5, 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.

6.

CHECK FRONT AIR CONTROL FOR PBR POWER AND GROUND

17 - Ground

: Continuity should not exist.

18 - Ground

: Continuity should not exist.

AWIIA0374ZZ

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

Front air control: 

M50

18 17

Rotate temp 

control dial

Battery 
voltage

AWIIA0375ZZ

Continuity should exist.

AWIIA0376ZZ

17 - 5

: Continuity should exist.

18 - 6

: Continuity should exist.

AWIIA1206ZZ