Nissan Titan A60. Manual - part 629

MODE DOOR MOTOR

HAC-199

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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1. Turn ignition switch OFF.

2. Disconnect the front air control harness connector M176 (A).

3. Check continuity between front air control harness connector

M176 (A) terminals 2, 15 and the mode door motor harness con-

nector M142 (B) terminals 1, 3.

4. Check continuity between front air control harness connector

M176 terminals 2, 15 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

M176 (A) terminal 16 and mode door motor harness connector

M142 (B) terminal 2.

2. Check continuity between front air control harness connector

M176 terminal 16 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 

A

B

Continuity

Connector

Terminal

Connector

Terminal

M176

2

M142

3

Yes

15

1

Connector

Terminal

—

Continuity

M176

2

Ground

No

15

AWIIA0498ZZ

A

B

Continuity

Connector

Terminal

Connector

Terminal

M176

16

M142

2

Yes

AWIIA0503ZZ

Connector

Terminal

—

Continuity

M176

16

Ground

No

AWIIA0499ZZ

HAC-200

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

MODE DOOR MOTOR

1. Reconnect front air control harness connectors.

2. Turn ignition switch ON.

3. Check voltage between front air control harness connector

M176 terminal 2 and terminal 15.

4. Check voltage between front air control harness connector

M176 terminal 16 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace front air control. Refer to 

VTL-8, "Removal and

Installation"

.

6.

CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL 

1. Reconnect the mode door motor harness connector M142.

2. Check voltage between front air control harness connector

M176 terminal 16 and ground.

Is the inspection result normal?

YES

>> Inspect mode door for binding or mechanical failure. If

mode door moves freely, replace front air control. Refer

to 

VTL-8, "Removal and Installation"

.

NO

>> Replace the mode door motor. Refer to 

VTL-19,

"Removal and Installation"

.

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-) 

M176

2

M176

15

5 Volts

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Connector

Terminal

—

Voltage (Approx.)

M176

16

Ground

0 Volts

AWIIA0499ZZ

Connector

Terminal

—

Voltage (Approx.)

M176

16

Ground

0.2 to 4.8 Volts

AWIIA0499ZZ

AIR MIX DOOR MOTOR

HAC-201

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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AIR MIX DOOR MOTOR

System Description

INFOID:0000000006164816

SYSTEM DESCRIPTION

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:

• Front air control

• Air mix door motor

• PBR (built-into air mix door motors)

• Intake sensor

System Operation

The front air control receives data from the temperature selected by the driver side, passenger side, and rear.

The front air control then applies a voltage to one circuit of the appropriate air mix door motor, while ground is

applied to the other circuit, causing the appropriate 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 con-

trol monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.

Air Mix Door Control Specification

COMPONENT DESCRIPTION

Air Mix Door Motors

The air mix door motor is attached to the front heater & cooling unit

assembly. The 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:0000000006164817

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1. Turn the temperature control dial clockwise to maximum hot.

2. Check for hot air at discharge air outlets.

WJIA0435E

WJIA1417E

HAC-202

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

AIR MIX DOOR MOTOR

>> 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-202, "Air Mix Door Motor Diagnosis Procedure"

.

Air Mix Door Motor Diagnosis Procedure

INFOID:0000000006164818

Regarding Wiring Diagram information, refer to 

HAC-232, "Wiring Diagram - Manual With 3 Control Dial Sys-

tem"

.

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

1.

CHECK AIR MIX DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the front air control harness connector M176 (A) and

the air mix door motor harness connector M147 (B).

3. Check continuity between front air control harness connector

M176 (A) terminals 3, 4 and the air mix door motor harness con-

nector M147 (B) terminals 1, 6.

4. Check continuity between front air control harness connector

M176 terminals 3, 4 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness as necessary.

2.

CHECK FRONT AIR CONTROL FOR AIR MIX DOOR MOTOR POWER AND GROUND 

A

B

Continuity

Connector

Terminal

Connector

Terminal

M176

3

M147

1

Yes

4

6

Connector

Terminal

—

Continuity

M176

3

Ground

No

4

AWIIA0508ZZ

AWIIA0505ZZ