Nissan Frontier D40. Manual - part 749

BLOWER MOTOR

HAC-99

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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HAC

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Front Blower Motor Diagnosis Procedure

INFOID:0000000005275936

Regarding Wiring Diagram information, refer to 

HAC-117, "Wiring Diagram - Air Conditioner Control - Without

VBC"

.

SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.

1.

DIAGNOSTIC PROCEDURE

1.

Turn ignition switch ON.

2.

Turn the front blower switch to each of its four speeds.
Does blower motor rotate normally at each speed?

YES or NO

YES

>> Inspection End.

NO

>> 1.

Does not rotate at any speed, GO TO 2.

2.

Does not rotate at 1 - 3 speed, GO TO 13.

3.

Does not rotate at 4 speed, GO TO 16.

2.

CHECK FUSES

1.

Check 15A fuses (Nos. 24 and 27, located in the fuse and fusible link box). Refer to 

PG-80, "Terminal

Arrangement"

.

2.

Check 10A fuse [No. 8, located in the fuse block (J/B)]. Refer to 

PG-79, "Terminal Arrangement"

.

Is inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 8.

3.

CHECK FRONT BLOWER MOTOR POWER SUPPLY

WJIA1503E

HAC-100

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

BLOWER MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor harness connector.

3.

Turn ignition switch ON.

4.

Select any front blower speed except OFF.

5.

Check voltage between front blower motor harness connector
M62 terminal 2 and ground.

Is inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 4.

4.

CHECK FRONT BLOWER MOTOR RELAY

1.

Turn Ignition switch OFF.

2.

Check front blower motor relay. Refer to 

HAC-102, "Front Blower Motor Component Inspection"

.

Is inspection result normal?

YES

>> GO TO 5.

NO

>> Replace front blower motor relay.

5.

CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (SWITCH SIDE)

Check voltage between front blower motor relay harness connector
E54 terminals 7 and 5 and ground.

Is inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (COIL SIDE)

1.

Turn ignition switch ON.

2.

Check voltage between front blower motor relay harness con-
nector E54 terminal 1 and ground.

Is inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace harness as necessary.

7.

CHECK FRONT BLOWER MOTOR POWER FROM RELAY TO FRONT BLOWER MOTOR

2 - Ground

: Battery voltage

WJIA1331E

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Condition

Voltage (Ap-

prox.)

(+)

Front air control 

connector

Terminal 

(-)

E54

5 Ground

Blower motor 

relay power 

supply

Battery voltage

E54

7 Ground

Blower motor 

relay power 

supply

Battery voltage

WJIA1634E

A

Condition

Voltage (Ap-

prox.)

(+)

Front air control 

connector

Terminal 

(-)

E54

1 Ground

Blower motor 

relay power 

supply (coil 

side)

Battery voltage

WJIA1991E

BLOWER MOTOR

HAC-101

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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1.

Turn ignition switch OFF.

2.

Check continuity between front blower motor relay harness con-
nector E54 terminals 6 and 3 and front blower motor harness
connector M62 terminal 2.

Is inspection result normal?

YES

>> Repair the blower motor ground circuit as necessary.

NO

>> Repair harness or connector between the front blower

motor relay and the front blower motor.

8.

REPLACE FUSE

Refer to 

PG-80, "Terminal Arrangement"

.

Does fuse No. 24 or 27 open when the front blower motor is turned on?
YES or NO

YES

>> GO TO 10.

NO

>> GO TO 9.

9.

REPLACE FUSE

Refer to 

PG-79, "Terminal Arrangement"

.

Does fuse No. 8 open when the ignition switch is turned ON?
YES or NO

YES

>> Repair or replace harness as necessary.

NO

>> Inspection End.

10.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor connector.

3.

Check continuity between front blower motor harness connector
M62 terminal 2 and ground.

Is inspection result normal?

YES

>> GO TO 11.

NO

>> Repair or replace harness as necessary.

11.

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

1.

Disconnect front blower motor relay connector.

2.

Check continuity between the front blower motor relay harness
connector E54 terminal 7 and terminal 5 and ground.

Is inspection result normal?

YES

>> Check front blower motor. Refer to 

HAC-99, "Front

Blower Motor Diagnosis Procedure"

.

NO

>> Repair harness or connector.

12.

CHECK FRONT BLOWER MOTOR

1.

Turn ignition switch OFF.

2.

Check front blower motor. Refer to 

HAC-102, "Front Blower Motor Component Inspection"

.

Is inspection result normal?

3, 6 - 2

: Continuity should exist.

WJIA1333E

2 - Ground

: Continuity should not exist.

WJIA0649E

7, 5 - Ground

: Continuity should not exist.

WJIA1334E

HAC-102

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

BLOWER MOTOR

YES

>> GO TO 13.

NO

>> Replace front blower motor. Refer to 

VTL-9, "Removal and Installation"

.

13.

CHECK FRONT BLOWER MOTOR RESISTOR

Check front blower motor resistor. Refer to 

HAC-102, "Front Blower Motor Component Inspection"

.

Is inspection result normal?

YES

>> GO TO 14.

NO

>> Replace front blower motor resistor. Refer to 

VTL-11, "Removal and Installation"

.

14.

CHECK FRONT BLOWER SWITCH

Check front blower switch. Refer to 

HAC-102, "Front Blower Motor Component Inspection"

.

Is inspection result normal?

YES

>> GO TO 15.

NO

>> Replace front blower switch. Refer to 

VTL-7, "Removal and Installation"

.

15.

CHECK FRONT BLOWER MOTOR GROUND CIRCUIT TO FRONT BLOWER MOTOR RESISTOR

1.

Disconnect front blower motor resistor harness connector.

2.

Check continuity between front blower motor connector M62 (A)
terminal 1 and front blower motor resistor harness connector
M122 (B) terminal 3.

Is inspection result normal?

YES

>> Repair harness or connector between front blower

switch connector M51 terminal 8 and ground.

NO

>> Repair harness or connector between front blower motor resistor and front blower motor.

16.

CHECK FRONT BLOWER SWITCH

Check front blower switch. Refer to 

HAC-102, "Front Blower Motor Component Inspection"

.

Is inspection result normal?

YES

>> Repair harness or connector between front blower motor switch connector M51 terminal 8 and

front blower motor resistor connector M122 terminal 3.

NO

>> Replace front blower switch. Refer to 

VTL-7, "Removal and Installation"

.

SYMPTOM: Blower motor operation is malfunctioning.

Front Blower Motor Component Inspection

INFOID:0000000005275937

COMPONENT INSPECTION

Front Blower Motor Relay

A

B

Connector

Terminal Connector

Terminal 

Continuity

Front blower motor: 

M62

1 

Front blower mo-

tor resistor: M122

3

Yes

WJIA1676E