Nissan Xterra. Manual - part 457

HAC-26

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INTAKE DOOR MOTOR

2. Press vent mode (

) switch.

3. Press REC (

) switch. 

4. Press REC (

) switch again.

5. Listen for intake door position change (you should hear blower sound change slightly).
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-26, "Intake Door Motor Diagnosis Procedure"

.

Intake Door Motor Diagnosis Procedure

INFOID:0000000009482476

Regarding Wiring Diagram information, refer to 

HAC-45, "Wiring Diagram"

.

SYMPTOM:

• Intake door does not change.

• Intake door motor does not operate normally.

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

1.

CHECK INTAKE 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 intake door motor harness connector

M58.

3. Check continuity between front air control harness connector M50 terminals 21, 22 and the intake door

motor harness connector M58 terminals 1, 6.

4. Check continuity between front air control harness connector

M50 terminals 21, 22 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness as necessary.

2.

CHECK FRONT AIR CONTROL FOR INTAKE DOOR MOTOR POWER AND GROUND 

1. Reconnect front air control harness connector.

2. Turn ignition switch ON.

3. Check voltage between front air control harness connector M50

terminal 21 and terminal 22 while placing the HVAC system into

self-diagnostic mode.

Is the inspection result normal?

YES

>> Inspect intake door for binding or mechanical failure. If intake door moves freely, replace the

intake door motor. Refer to 

VTL-18, "Removal and Installation"

.

NO

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

Connector

Terminal

Connector

Terminal

Continuity

M50

21

M58

6

Yes

22

1

Connector

Terminal

—

Continuity

M50

21

Ground

No

22

AWIIA0398ZZ

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M50

22

21

Self-diagnostic mode (opening)

Battery voltage

21

22

Self-diagnostic mode (closing)

Battery voltage

AWIIA0399ZZ

BLOWER MOTOR

HAC-27

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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F

G

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A

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HAC

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BLOWER MOTOR

System Description

INFOID:0000000009482477

Component Parts

Blower speed control system components are:

• Front air control

• Variable blower control

• Front blower motor

• Front blower motor relay

System Operation

COMPONENT DESCRIPTION

Variable Blower Control

The variable blower control (1) is located on the heater and cooling

unit assembly. The variable blower control receives a gate voltage

from the front air control to steplessly maintain the blower motor volt-

age in the 0 to 5 volt range (approx.) 

⇒: front

Front Blower Motor Component Function Check

INFOID:0000000009482478

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER

1. Rotate the blower control dial clockwise. Blower should operate.

2. Rotate the blower control dial clockwise, and continue checking blower speed until all speeds are

checked.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-28, "Front Blower Motor Diagnosis Procedure"

.

AWIIA1209ZZ

AWIIA1225ZZ

HAC-28

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

BLOWER MOTOR

Front Blower Motor Diagnosis Procedure

INFOID:0000000009482479

Regarding Wiring Diagram information, refer to 

HAC-45, "Wiring Diagram"

.

SYMPTOM: Blower motor operation is malfunctioning.

DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR

1.

CHECK FUSES

Check 15A fuses [No. 24 and 27 (Located in the fuse and fusible link box)]. For fuse layout refer to 

PG-69,

"Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 9.

2.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT 

1. Turn ignition switch OFF.

2. Disconnect front blower motor connector.

3. Turn ignition switch ON.

4. Rotate blower control dial to maximum speed.

5. Press the A/C switch.

6. Check voltage between front blower motor harness connector

M62 terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 3.

3.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT

AWIIA1784GB

Fuses are good.

2 - Ground

: Battery voltage

WJIA1331E

BLOWER MOTOR

HAC-29

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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1. Turn ignition switch OFF.

2. Disconnect front blower motor relay.

3. Check voltage between front blower motor relay harness con-

nector E54 terminals 5,7 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK FRONT BLOWER MOTOR RELAY

Turn ignition switch OFF.

Check front blower motor relay. Refer to 

HAC-31, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace front blower motor relay.

5.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN

Check continuity between front blower motor relay harness connec-

tor E54 terminals 3, 6 and front blower motor harness connector

M62 terminal 2.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN

1. Disconnect variable blower control harness connector.

2. Check continuity between front blower motor relay harness con-

nector E54 (A) terminals 3, 6 and variable blower control har-

ness connector M121 (B) terminal 4.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT

Check continuity between front blower motor relay harness connec-

tor E54 terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 8. 

NO

>> Repair harness or connector.

8.

CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY

5, 7 - Ground

: Battery voltage

WJIA1634E

3, 6 - 2

: Continuity should exist.

WJIA1333E

3, 6 - 4

: Continuity should exist.

AWIIA1212ZZ

2 - Ground

: Continuity should exist

AWIIA1227ZZ