Nissan Frontier D40. Manual - part 746

MANUAL A/C IDENTIFICATION TABLE

HAC-87

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

COMPONENT DIAGNOSIS

MANUAL A/C IDENTIFICATION TABLE

Application Table

INFOID:0000000005275924

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

HAC-88

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

MODE DOOR MOTOR

MODE DOOR MOTOR

System Description

INFOID:0000000005275925

SYSTEM DESCRIPTION

Component Parts

Mode door control system components are:

• Front air control
• Mode door motor
• 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:0000000005275926

SYMPTOM:

• Air outlet does not change.
• Mode door motor does not operate normally.

INSPECTION FLOW

WJIA1314E

WJIA1484E

MODE DOOR MOTOR

HAC-89

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR

1.

Turn blower control dial to 4. 

2.

Turn the mode dial and check all positions. 

3.

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

HAC-82, "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 the diagnosis procedure. Refer to 

HAC-89, "Mode Door Motor Diagnosis Procedure"

.

Mode Door Motor Diagnosis Procedure

INFOID:0000000005275927

Regarding Wiring Diagram information, refer to 

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

VBC"

.

MODE DOOR MOTOR DIAGNOSTIC PROCEDURE

1.

CHECK POWER SUPPLY AND GROUND CIRCUITS FOR MODE DOOR MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector and mode door motor
connector.

3.

Check continuity between front air control harness connector
M49 terminal 1 and mode door motor harness connector M142
terminal 1 and between front air control harness connector M49
terminal 14 and mode door motor harness connector M142 ter-
minal 6.

Is inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness as necessary.

2.

CHECK PBR REFERENCE SIGNAL VOLTAGE

1.

Reconnect the front air control connector.

2.

Turn ignition switch ON.

3.

Check voltage between mode door motor harness connector
M142 terminal 3 and ground.

Is inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN MODE DOOR AND FRONT AIR CONTROL

1 - 1

: Continuity should exist.

14 - 6

: Continuity should exist.

WJIA1241E

 3 - Ground

: Approx. 5V

WJIA1242E

HAC-90

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

MODE DOOR MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between mode door motor harness connector
M142 terminal 3 and front air control harness connector M49 ter-
minal 23.

Is inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

4.

CHECK PBR GROUND REFERENCE CIRCUIT 

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between mode door motor harness connector
M142 terminal 2 and front air control harness connector M49 ter-
minal 26.

Is inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness as necessary.

5.

CHECK PBR FEEDBACK SIGNAL

1.

Reconnect the front air control connector and mode door motor
connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M49
terminal 21 and ground.

4.

Press mode switch through all modes.

Is inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> GO TO 6.

6.

CHECK PBR FEEDBACK CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the mode door motor connector and front air control
harness connector.

3.

Check continuity between mode door motor harness connector
M142 terminal 4 and front air control harness connector M49 ter-
minal 21.

Is inspection result normal?

YES

>> Replace mode door motor. Refer to 

VTL-18, "Removal

and Installation"

.

NO

>> Repair or replace harness as necessary.

3 - 23

: Continuity should exist.

WJIA1085E

2 - 26

: Continuity should exist.

WJIA1087E

21 - Ground

: Approx. 0 - 5V

WJIA1088E

4 - 21

: Continuity should exist.

WJIA1089E