Nissan Frontier. Manual - part 887

HAC-102

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

MANUAL A/C IDENTIFICATION TABLE

DTC/CIRCUIT DIAGNOSIS

MANUAL A/C IDENTIFICATION TABLE

Application Table

INFOID:0000000009478334

Manual A/C Type

Description

Visual Identification

Manual A/C (Type 1)

Two Control Dial System 

[with variable blower control 

(VBC)]

Manual A/C (Type 2)

Three Control Dial System 

[without variable blower con-

trol (VBC)]

AWIIA0481ZZ

AWIIA1228ZZ

MODE DOOR MOTOR

HAC-103

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

MODE DOOR MOTOR

System Description

INFOID:0000000009478335

SYSTEM DESCRIPTION

Component Parts

Mode door control system components are:

• Front air control

• Mode door motor

• Position Balanced Resistor (PBR) (built into mode door motor)

• Intake sensor

System Operation

The mode door position (vent, B/L, foot, D/F, and defrost) is set by the front air control by means of the mode

door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of

the mode door motor while ground is applied to the other circuit, causing the mode 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 mode door position by measuring the voltage signal on the PBR circuit.

COMPONENT DESCRIPTION

Mode Door Motor

The mode door motor is attached to the heater and cooling unit

assembly. It rotates so that air is discharged from the outlet as indi-

cated by the front air control. Motor rotation is conveyed to a link

which activates the mode door.

Mode Door Motor Component Function Check

INFOID:0000000009478336

SYMPTOM:

• Air outlet does not change.

• Mode door motor does not operate normally.

INSPECTION FLOW

WJIA1314E

WJIA1484E

HAC-104

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

MODE DOOR MOTOR

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR

1. Turn blower control dial to HI speed. 

2. Press each mode switch and check all positions. 

3. Confirm that discharge air comes out according to the air distribution table. Refer to 

HAC-96, "Discharge

Air Flow"

.

NOTE:

Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH
when DEF (

) or D/F (

) is selected.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-104, "Mode Door Motor Diagnosis Procedure"

.

Mode Door Motor Diagnosis Procedure

INFOID:0000000009478337

Regarding Wiring Diagram information, refer to 

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

.

SYMPTOM:

• Air outlet does not change.

• Mode door motor does not operate normally.

1.

CHECK MODE 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 mode door motor harness connector

M142 (B).

3. Check continuity between front air control harness connector M50 (A) terminals 23, 24 and the mode door

motor harness connector M142 (B) terminals 1, 6.

4. Check continuity between front air control harness connector M50 terminals 23, 24 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness as necessary.

2.

CHECK FRONT AIR CONTROL FOR MODE DOOR MOTOR POWER AND GROUND 

1. Reconnect front air control harness connector.

2. Turn ignition switch ON.
3. Press the mode switch D/F (

) mode. 

4. Check voltage between front air control harness connector M50 terminal 23 and terminal 24 while press-

ing the VENT (

) mode, and then the B/L (

) mode. 

A

B

Continuity

Connector

Terminal

Connector

Terminal

M50

24

M142

1

Yes

23

6

Connector

Terminal

—

Continuity

M50

24

Ground

No

23

MODE DOOR MOTOR

HAC-105

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

3.

CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the front air control harness connector M50 and M59.

3. Check continuity between front air control harness connector M50 (A) terminal 3 and 59 (A) terminal 28,

and the mode door motor harness connector M142 (B) terminals 2, 3.

4. Check continuity between front air control harness connector M50 (A) terminal 3 and M59 (A) terminal 28,

and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness as necessary.

4.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND 

1. Check continuity between front air control harness connector M50 (A) terminal 10 and mode door motor

harness connector M142 (B) terminal 4.

2. Check continuity between front air control harness connector M50 (A) terminal 10 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.

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M50

24

23

While pressing the mode control from 
D/F (

) mode to VENT (

) mode

Battery voltage

23

24

While pressing the mode control from 

VENT (

) mode to B/L (

) mode

Battery voltage

A

B

Continuity

Connector

Terminal

Connector

Terminal

M50

3

M142

2

Yes

M59

28

3

Connector

Terminal

—

Continuity

M50 (A)

3

Ground

No

M59 (A)

28

A

B

Continuity

Connector

Terminal

Connector

Terminal

M50

10

M142

4

Yes

Connector

Terminal

—

Continuity

M50 (A)

10

Ground

No