Nissan Frontier. Manual - part 889

HAC-110

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

AIR MIX DOOR MOTOR

1. Check continuity between front air control harness connector

M50 (A) terminal 6 and air mix door motor harness connector

M147 (B) terminal 2.

2. Check continuity between front air control harness connector

M50 terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace harness as necessary.

5.

CHECK FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK

SIGNAL 
1. Reconnect front air control harness connectors.

2. Turn ignition switch ON.

3. Check voltage between front air control harness connector M50 terminal 3 and M59 terminal 28.

4. Check voltage between front air control harness connector M50

terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace front air control. Refer to 

VTL-7, "Removal and

Installation"

.

6.

CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL 

1. Reconnect the air mix door motor harness connector M147.

2. Check voltage between front air control harness connector M50

terminal 6 and ground.

Is the inspection result normal?

YES

>> Inspect air mix door for binding or mechanical failure. If

air mix door moves freely, replace front air control. Refer

to 

VTL-7, "Removal and Installation"

.

A

B

Continuity

Connector

Terminal

Connector

Terminal

M50

6

M147

2

Yes

AWIIA1208ZZ

Connector

Terminal

—

Continuity

M50

6

Ground

No

AWIIA0383ZZ

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-) 

M59

28

M50

3

5 Volts

Connector

Terminal

—

Voltage (Approx.)

M50

6

Ground

0 Volts

AWIIA0382ZZ

Connector

Terminal

—

Voltage (Approx.)

M50

6

Ground

0.2 to 4.8 Volts

AWIIA0382ZZ

AIR MIX DOOR MOTOR

HAC-111

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

NO

>> Replace the air mix door motor. Refer to 

VTL-23, "Removal and Installation"

.

HAC-112

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

INTAKE DOOR MOTOR

INTAKE DOOR MOTOR

System Description

INFOID:0000000009478341

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:0000000009478342

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

INTAKE DOOR MOTOR

HAC-113

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

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-113, "Intake Door Motor Diagnosis Procedure"

.

Intake Door Motor Diagnosis Procedure

INFOID:0000000009478343

Regarding Wiring Diagram information, refer to 

HAC-133, "Wiring Diagram - With Type 1"

.

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

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 front air control harness connector M50 (A) and

the intake door motor harness connector M58 (B).

3. Check continuity between front air control harness connector

M50 (A) terminals 21, 22 and the intake door motor harness

connector M58 (B) terminals 1, 6.

4. Check continuity between front air control harness connector

M50 terminals 8, 7 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 M50

terminal 21 and terminal 22 while placing the HVAC system into

self-diagnostic mode.

A

B

Continuity

Connector

Terminal

Connector

Terminal

M50

21

M58

6

Yes

22

1

AWIIA0401ZZ

Connector

Terminal

—

Continuity

M50

21

Ground

No

22

AWIIA0398ZZ

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M50

22

21

Self-diagnostic mode (opening)

Battery voltage

21

22

Self-diagnostic mode (closing)

Battery voltage

AWIIA0399ZZ