Nissan Frontier. Manual - part 871

 

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Nissan Frontier. Manual - part 871

 

 

HAC-38

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

SYMPTOM: Blower motor operation is malfunctioning under starting

blower speed control.

1.

CHECK FUSES

Check 15A fuses [No. 24 and 27 (Located in the fuse and fusible link box)]. For fuse layout. Refer to 

PG-80,

"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 12.

NO

>> GO TO 3.

3.

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

1. Turn ignition switch OFF.

2. Disconnect front blower motor relay.

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

nector E54 terminals 5,7 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

ALIIA0760GB

Fuses are good.

2 - Ground

: Battery voltage

WJIA1331E

5, 7 - Ground

: Battery voltage

WJIA1634E

BLOWER MOTOR CONTROL SYSTEM

HAC-39

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

4.

CHECK FRONT BLOWER MOTOR RELAY

Turn ignition switch OFF.

Check front blower motor relay. Refer to 

HAC-41, "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 E54 terminals 3, 6 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 E54 (A) terminals 3, 6 and variable blower control har-

ness connector M121 (B) terminal 4.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT

Check continuity between front blower motor relay harness connec-

tor E54 terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 8. 

NO

>> Repair harness or connector.

8.

CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY

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

>> Replace variable blower control. Refer to 

VTL-12,

"Removal and Installation"

.

NO

>> Repair front blower motor ground circuit or connector.

3, 6 - 2

: Continuity should exist.

WJIA1333E

3, 6 - 4

: Continuity should exist.

AWIIA1212ZZ

2 - Ground

: Continuity should exist

AWIIA1227ZZ

1 - Ground

: Battery voltage

WJIA1991E

HAC-40

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

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-41, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> Replace variable blower control. Refer to 

VTL-12, "Removal and Installation"

.

NO

>> Replace front blower motor. Refer to 

VTL-11, "Removal and Installation"

.

12.

CHECK FRONT BLOWER MOTOR

Check front blower motor. Refer to 

HAC-41, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace front blower motor. Refer to 

VTL-11, "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

4 - Ground

: Continuity should not exist.

AWIIA0177ZZ

1 - 2

: Continuity should exist.

AWIIA0179ZZ

BLOWER MOTOR CONTROL SYSTEM

HAC-41

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

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. Disconnect front air control connector.

3. Turn ignition switch ON.

4. Turn blower control dial to maximum speed.

5. check voltage between front air control harness connector M50 terminal 13 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "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 (B) terminal 13 and variable blower control harness con-

nector M121 (A) terminal 3.

Is the inspection result normal?

YES

>> Replace variable blower control. Refer to 

VTL-12,

"Removal and Installation"

.

NO

>> Repair harness or connector.

Front Blower Motor Component Inspection

INFOID:0000000009478288

COMPONENT INSPECTION 

Front Blower Motor Relay

3, 6 - 4

: Continuity should exist.

AWIIA1212ZZ

1 - Ground

: Continuity should exist.

AWIIA0180ZZ

13 - Ground

Approx.: 4.5V

13 - 3

: Continuity should exist.

AWIIA0414ZZ

 

 

 

 

 

 

 

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