Nissan Frontier. Manual - part 904

HAC-170

< SYSTEM DESCRIPTION >

[MANUAL A/C (TYPE 2)]

DIAGNOSIS SYSTEM (BCM)

AIR CONDITIONER : CONSULT Function (BCM - AIR CONDITIONER)

INFOID:0000000009478383

DATA MONITOR

Monitor Item [Unit]

Description

IGN ON SW [On/Off]

Indicates condition of ignition switch ON position.

FAN ON SIG [On/Off]

Indicates condition of fan switch.

AIR COND SW [On/Off]

Indicates condition of A/C switch.

MANUAL A/C IDENTIFICATION TABLE

HAC-171

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

DTC/CIRCUIT DIAGNOSIS

MANUAL A/C IDENTIFICATION TABLE

Application Table

INFOID:0000000009478384

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-172

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

MODE DOOR MOTOR

MODE DOOR MOTOR

System Description

INFOID:0000000009478385

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:0000000009478386

SYMPTOM:

• Air outlet does not change.

• Mode door motor does not operate normally.

INSPECTION FLOW

WJIA1314E

WJIA1484E

MODE DOOR MOTOR

HAC-173

< DTC/CIRCUIT 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-166, "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-173, "Mode Door Motor Diagnosis Procedure"

.

Mode Door Motor Diagnosis Procedure

INFOID:0000000009478387

Regarding Wiring Diagram information, refer to 

HAC-200, "Wiring Diagram - With Type 2"

.

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 M49 and the

mode door motor harness connector M142.

3. Check continuity between front air control harness connector

M49 terminals 1, 14 and the mode door motor harness connec-

tor M142 terminals 1, 6.

4. Check continuity between front air control harness connector

M49 terminals 1, 14 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. Rotate the mode switch to the D/F (

) mode. 

4. Check voltage between front air control harness connector M49 terminal 1 and terminal 14 while rotating

the mode control dial to the VENT (

), and then the B/L (

) mode. 

Connector

Terminal

Connector

Terminal

Continuity

M49

1

M142

1

Yes

14

6

Connector

Terminal

—

Continuity

M49

1

Ground

No

14

WJIA1241E