Nissan Frontier. Manual - part 907

 

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Nissan Frontier. Manual - part 907

 

 

HAC-182

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

BLOWER MOTOR

BLOWER MOTOR

System Description

INFOID:0000000009478394

Component Parts

Blower speed control system components are:

• Front air control

• Front blower motor resistor

• Front blower motor

• Front blower relay

• Front blower switch

System Operation

COMPONENT DESCRIPTION

Blower Motor Resistor

The front blower motor resistor (1) is located on the heater and cool-

ing unit assembly. The front blower motor resistor grounds the front

blower motor through a series of 1, 2, or 3 resistors, depending upon

speed selected. For high speed operation the front blower motor

resistor is circumvented and the front blower motor grounds directly.

Front Blower Motor Component Function Check

INFOID:0000000009478395

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-183, "Front Blower Motor Diagnosis Procedure"

.

AWIIA0272GB

AWIIA1196ZZ

BLOWER MOTOR

HAC-183

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Front Blower Motor Diagnosis Procedure

INFOID:0000000009478396

Regarding Wiring Diagram information, refer to 

HAC-200, "Wiring Diagram - With Type 2"

.

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-184

< DTC/CIRCUIT 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-186, "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.

2 - Ground

: Battery voltage

WJIA1331E

A

Condition

Voltage (Ap-

prox.)

(+)

Front blower mo-

tor relay connec-

tor

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 blower mo-

tor relay connec-

tor

Terminal 

(-)

E54

1 Ground

Blower motor 

relay power 

supply (coil 

side)

Battery voltage

WJIA1991E

BLOWER MOTOR

HAC-185

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

7.

CHECK FRONT BLOWER MOTOR POWER FROM RELAY TO FRONT BLOWER MOTOR

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-186, "Front

Blower Motor Component Inspection"

.

NO

>> Repair harness or connector.

12.

CHECK FRONT BLOWER MOTOR

1. Turn ignition switch OFF.

2. Check front blower motor. Refer to 

HAC-186, "Front Blower Motor Component Inspection"

.

3, 6 - 2

: Continuity should exist.

WJIA1333E

2 - Ground

: Continuity should not exist.

WJIA0649E

7, 5 - Ground

: Continuity should not exist.

WJIA1334E

 

 

 

 

 

 

 

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