Nissan Xterra. Manual - part 458

HAC-30

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

BLOWER MOTOR

1. Turn ignition switch ON.

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

nector E54 terminal 1 and ground.

Is the inspection result normal?

YES

>> Intermittent incident. Refer to 

GI-40, "Intermittent Inci-

dent"

.

NO

>> Repair harness or connector.

9.

REPLACE FUSES

Replace fuses.
Does the fuse blow?

YES

>> • If fuse blows without activating the front blower motor, repair short between fuse and front

blower motor relay. 

• If fuse blows activating the front blower motor, GO TO 10. 

NO

>> Inspection End.

10.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

1. Turn ignition switch OFF.

2. Disconnect front blower motor connector and variable blower

control connector.

3. Check continuity between variable blower control harness con-

nector M121 terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Repair harness or connector.

11.

CHECK FRONT BLOWER MOTOR

Check front blower motor. Refer to 

HAC-31, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> Replace variable blower control. Refer to 

VTL-10, "Removal and Installation"

.

NO

>> Replace front blower motor. Refer to 

VTL-9, "Removal and Installation"

.

12.

CHECK FRONT BLOWER MOTOR

Check front blower motor. Refer to 

HAC-31, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace front blower motor. Refer to 

VTL-9, "Removal and Installation"

.

13.

CHECK BLOWER MOTOR GROUND CIRCUIT

1. Disconnect variable blower control harness connector.

2. Check continuity between front blower motor harness connector

M62 (B) terminal 1 and variable blower control harness connec-

tor M121 (A) terminal 2.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Repair harness or connector.

14.

CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN

1 - Ground

: Battery voltage

WJIA1991E

4 - Ground

: Continuity should not exist.

AWIIA0177ZZ

1 - 2

: Continuity should exist.

AWIIA0179ZZ

BLOWER MOTOR

HAC-31

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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HAC

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Check continuity between front blower motor relay harness connec-

tor E54 (A) terminals 3, 6 and variable blower control harness con-

nector M121 (B) terminal 4.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Repair harness or connector.

15.

CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT

Check continuity between variable blower control harness connector

M121 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 16. 

NO

>> Repair harness or connector.

16.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT

1. Reconnect all disconnected component connectors.

2. Turn ignition switch ON.

3. While turning blower control dial from minimum to maximum speed, check voltage between variable

blower control connector M121 terminal 3 and ground.

Is the inspection result normal?

YES

>> Replace variable blower control. Refer to 

VTL-10, "Removal and Installation"

.

NO

>> GO TO 17.

17.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect variable blower control.

3. Check continuity between front air control harness connector M50 terminal 13 and variable blower control

harness connector M121 terminal 3.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

Front Blower Motor Component Inspection

INFOID:0000000009482480

COMPONENT INSPECTION 

Front Blower Motor Relay

3, 6 - 4

: Continuity should exist.

AWIIA1212ZZ

1 - Ground

: Continuity should exist.

AWIIA0180ZZ

3 - Ground

Varying between approx.: 0 to 4.5V

13 - 3

: Continuity should exist.

HAC-32

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

BLOWER MOTOR

Check continuity between terminals 3 and 5 and terminals 7 and 6

by supplying 12 volts and ground to coil side terminals 1 and 2 of the

relay.

Front Blower Motor

Confirm smooth rotation of the blower motor.

• Ensure that there are no foreign particles inside the blower unit.

• Apply 12 volts to terminal 2 and ground to terminal 1 and verify that

the motor operates freely and quietly.

LJIA0068E

WJIA1508E

MAGNET CLUTCH

HAC-33

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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MAGNET CLUTCH

System Description

INFOID:0000000009482481

SYSTEM DESCRIPTION

When the blower speed dial is in one of the fan speed positions, the front air control outputs a fan ON signal to

the BCM. When the A/C switch is pressed, the A/C switch LED illuminates and the front air control outputs a

compressor ON signal to the BCM. Any mode control button can be selected. The front air control also moni-

tors the intake sensor for low temperature. As long as the BCM receives a compressor ON signal and a fan

ON signal from the front air control, the conditions required for the BCM to transmit a compressor ON request

to the ECM have been met. 

The BCM sends a compressor ON signal to ECM, via CAN communication line.

The ECM judges whether the compressor can be turned ON, based on each sensor status (refrigerant pres-

sure sensor signal, throttle angle sensor, etc.). If it judges the compressor can be turned ON, it sends a com-

pressor ON signal to IPDM E/R, via CAN communication line.

Upon receipt of a compressor ON signal from ECM, IPDM E/R turns the A/C relay ON to operate the compres-

sor.

Low Temperature Protection Control

The IPDM E/R will turn the compressor ON or OFF as determined by a signal detected from the intake sensor.

The front air control monitors the intake sensor, and based on the threshold temperatures will stop sending the

compressor ON signal to the BCM.

When intake air temperature is higher than 3.5

°C (38.3°F), the compressor turns ON. When the intake air tem-

perature is lower than 2.5

°C (36.5°F) the compressor turns OFF.

Magnet Clutch Component Function Check

INFOID:0000000009482482

SYMPTOM: Magnet clutch does not engage.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1. Rotate blower control dial clockwise. 
2. Press the vent (

) mode switch.

3. Press A/C switch. Confirm that the compressor clutch engages (sound or visual inspection). 
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-33, "Magnet Clutch Diagnosis Procedure"

.

Magnet Clutch Diagnosis Procedure

INFOID:0000000009482483

Regarding Wiring Diagram information, refer to 

HAC-45, "Wiring Diagram"

.

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH