Nissan Titan A60. Manual - part 632

 

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Nissan Titan A60. Manual - part 632

 

 

BLOWER MOTOR CONTROL SYSTEM

HAC-211

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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BLOWER MOTOR CONTROL SYSTEM

System Description

INFOID:0000000006164825

SYSTEM DESCRIPTION

Component Parts

Blower speed control system components are:

• Front air control

• Variable blower control

• Front blower motor relay

• Front blower motor

• Intake sensor

System Operation

COMPONENT DESCRIPTION

Variable Blower Control

The variable blower control is located on the cooling unit. The vari-

able blower control (1) receives a gate voltage from the front air con-

trol to steplessly maintain the blower motor voltage in the 0 to 5 volt

range (approx.).

Front Blower Motor Component Function Check

INFOID:0000000006164826

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER

1. Rotate the blower control dial clockwise once. Blower motor should operate in low speed.

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-212, "Front Blower Motor Diagnosis Procedure"

WJIA1385E

AWIIA1082ZZ

HAC-212

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

BLOWER MOTOR CONTROL SYSTEM

Front Blower Motor Diagnosis Procedure

INFOID:0000000006164827

Regarding Wiring Diagram information, refer to 

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

tem"

.

SYMPTOM: Blower motor operation is malfunctioning.

DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR

SYMPTOM: Blower motor operation is malfunctioning under starting

blower speed control.

1.

CHECK FUSES

Check 20A fuses [No. 24 and 27 (Located in the fuse and fusible link box)]. For fuse layout. Refer to 

PG-72,

"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. Press the A/C switch.

5. Rotate blower control dial to maximum speed.

6. Check voltage between front blower motor harness connector

M62 terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 3.

3.

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

AWIIA0535GB

Fuses are good.

2 - Ground

: Battery voltage

WJIA1331E

BLOWER MOTOR CONTROL SYSTEM

HAC-213

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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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 M107 terminal 5 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-215, "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 M107 terminal 3 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 M107 (A) terminals 3 and variable blower control harness

connector M121 (B) terminal 1.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT

1. Disconnect front air control connector.

2. Check continuity between front air control harness connector

M177 (B) terminal 40 and variable blower control harness con-

nector M121 (A) terminal 2.

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 - Ground

: Battery voltage

WJIA1886E

3 - 2

: Continuity should exist.

WJIA1360E

3 - 1

: Continuity should exist.

AWIIA1387ZZ

40 - 2

: Continuity should exist.

AWIIA0537ZZ

HAC-214

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

BLOWER MOTOR CONTROL SYSTEM

1. Turn ignition switch ON.

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

nector M107 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair front blower motor ground circuit or connector.

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 M121 terminal 1 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

M177 (B) terminal 40 and variable blower control harness con-

nector M121 (A) terminal 2.

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-211, "Front Blower Motor Component Function Check"

.

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

1 - Ground

: Battery voltage

AWIIA1388ZZ

1 - Ground

: Continuity should not exist.

AWIIA0539ZZ

40 - 2

: Continuity should exist.

AWIIA0537ZZ

 

 

 

 

 

 

 

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