Nissan Xterra. Manual - part 455

HAC-18

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MODE DOOR MOTOR

• Mode door motor does not operate normally.

INSPECTION FLOW

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-11, "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-18, "Mode Door Motor Diagnosis Procedure"

.

Mode Door Motor Diagnosis Procedure

INFOID:0000000009482470

Regarding Wiring Diagram information, refer to 

HAC-45, "Wiring Diagram"

.

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 and the mode door motor harness connector

M142.

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

motor harness connector M142 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 2.

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. 

Connector

Terminal

Connector

Terminal

Continuity

M50

24

M142

1

Yes

23

6

Connector

Terminal

—

Continuity

M50

23

Ground

No

24

MODE DOOR MOTOR

HAC-19

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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HAC

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Is the inspection result normal?

YES

>> GO TO 3.

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 connectors M50 and M2.

3. Check continuity between front air control harness connectors M50 terminal 3 and M2 terminal 28, and

the mode door motor harness connector M142 terminals 2, 3.

4. Check continuity between front air control harness connectors M50 terminal 3 and M2 terminal 28, and

ground.

Is the inspection result normal?

YES

>> GO TO 4.

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 terminal 10 and mode door motor har-

ness connector M142 terminal 4.

2. Check continuity between front air control harness connector M50 terminal 10 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

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 M2 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

Connector

Terminal

Connector

Terminal

Continuity

M50

3

M142

2

Yes

M2

28

3

Connector

Terminal

—

Continuity

M50

3

Ground

No

M2

28

Connector

Terminal

Connector

Terminal

Continuity

M50

10

M142

4

Yes

Connector

Terminal

—

Continuity

M50

10

Ground

No

HAC-20

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MODE DOOR MOTOR

4. Check voltage between front air control harness connector M50 terminal 10 and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace front air control. Refer to 

VTL-7, "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 M50 terminal 10 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-7, "Removal and Installation"

.

NO

>> Replace the mode door motor. Refer to 

VTL-19, "Removal and Installation"

.

Connector

Terminal

Connector

Terminal

Voltage (Approx.)

(+)

(-) 

M2

28

M50

3

5V

Connector

Terminal

—

Voltage (Approx.)

M50

10

Ground

0V

Connector

Terminal

—

Voltage (Approx.)

M50

10

Ground

0.2V to 4.8V

AIR MIX DOOR MOTOR

HAC-21

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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AIR MIX DOOR MOTOR

System Description

INFOID:0000000009482471

SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:

• Front air control

• Air mix door motor 

• Position Balanced Resistor (PBR) (built into air mix door motor)

• Intake sensor

System Operation

The front air control receives data from the temperature selected by the driver. The front air control then

applies a voltage to one circuit of the air mix door motor, while ground is applied to the other circuit, causing

the 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 control monitors the air mix door positions by measur-

ing the voltage signal on the PBR circuits of each door.

Air Mix Door Control Specification

COMPONENT DESCRIPTION

Air Mix Door Motor

WJIA1316E

WJIA0435E