Nissan Titan A60. Manual - part 591

BLOWER MOTOR CONTROL SYSTEM

HAC-47

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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9.

REPLACE FUSES

1. Replace fuses.

2. Activate the front blower motor.
Does the fuse blow?

YES

>> 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 M122 terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Repair harness or connector.

11.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT

1. Disconnect front air control connector.

2. Check continuity between front air control harness connector

M49 (B) terminal 13 and variable blower control harness con-

nector M122 (A) terminal 3.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Repair harness or connector.

12.

CHECK FRONT BLOWER MOTOR

Check front blower motor. Refer to 

HAC-48, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace front blower motor. Refer to 

VTL-12, "Removal and Installation"

.

13.

CHECK BLOWER MOTOR GROUND CIRCUIT

Check continuity between front blower motor harness connector

M62 (B) terminal 1 and variable blower control harness connector

M122 (A) terminal 2.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Repair harness or connector.

14.

CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT

4 - Ground

: Continuity should not exist.

AWIIA0177ZZ

13 - 3

: Continuity should exist.

AWIIA0414ZZ

1 - 2

: Continuity should exist.

AWIIA0179ZZ

HAC-48

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

Check continuity between variable blower control harness connector

M122 terminal 1 and ground.

Is the inspection result normal?

YES

>> Replace variable blower control. Refer to 

VTL-22,

"Removal and Installation"

.

NO

>> Repair harness or connector.

Front Blower Motor Component Inspection

INFOID:0000000006164702

COMPONENT INSPECTION 

Check continuity between terminals 3, and 5 by supplying 12 volts

and ground to coil side terminals 1 and 2 of 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.

1 - Ground

: Continuity should exist.

AWIIA0180ZZ

WJIA1401E

WJIA1508E

MAGNET CLUTCH

HAC-49

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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MAGNET CLUTCH

System Description

INFOID:0000000006164703

SYSTEM DESCRIPTION

The front air control controls compressor operation based on ambient and intake temperature and a signal

from ECM.

Low Temperature Protection Control

The front air control will turn the compressor ON or OFF as determined by a signal detected by the intake sen-

sor and the ambient sensor.

When intake air temperature is higher than the preset value, the compressor turns ON. The compressor turns

OFF when intake air temperature is lower than the preset value. That preset value is dependent on the ambi-

ent temperature, refer to the following table.

Magnet Clutch Component Function Check

INFOID:0000000006164704

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1. Turn ignition switch ON.

2. Press the A/C switch.
3. Press vent mode switch (

).

4. Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower

speed will depend on ambient, in-vehicle and set temperatures.)

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-49, "Magnet Clutch Diagnosis Procedure"

.

Magnet Clutch Diagnosis Procedure

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Regarding Wiring Diagram information, refer to 

HAC-71, "Wiring Diagram - Automatic Air Conditioner"

.

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

Ambient temperature 

°C (°F)

Compressor ON intake temperature 

°C 

(

°F)

Compressor OFF intake temperature 

°C (°F)

0 (32)

5.5 (42)

5.0 (41)

10 (50)

5.5 (42)

5.0 (41)

20 (68)

5.5 (42)

5.0 (41)

30 (86)

4.0 (39)

3.5 (38)

40 (104)

3.5 (38)

3.0 (37)

50 (122)

3.5 (38)

3.0 (37)

HAC-50

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MAGNET CLUTCH

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

1.

CHECK INTAKE AND AMBIENT SENSOR CIRCUITS

Check intake and ambient sensors. Refer to 

HAC-21, "Front Air Control Self-Diagnosis"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> • Malfunctioning intake sensor. Refer to 

HAC-64, "Intake Sensor Diagnosis Procedure"

.

• Malfunctioning ambient sensor. Refer to 

HAC-56, "Ambient Sensor Diagnosis Procedure"

.

2.

PERFORM AUTO ACTIVE TEST

Refer to 

PCS-11, "Diagnosis Description"

.

Does magnet clutch operate?

YES

>> •

WITH CONSULT-III

GO TO 5.

•

WITHOUT CONSULT-III

GO TO 6.

NO

>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.

3.

CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R connector and compressor (magnet

clutch) connector.

3. Check continuity between IPDM E/R harness connector E119

terminal 11 and A/C compressor harness connector F3 terminal

1.

4. Check continuity between IPDM E/R harness connector E119

terminal 11 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

AWIIA1070GB

11 – 1

: Continuity should exist.

11 – ground

: Continuity should not exist.

WJIA0560E