Nissan Frontier. Manual - part 890

HAC-114

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

INTAKE DOOR MOTOR

Is the inspection result normal?

YES

>> Inspect intake air door for binding or mechanical failure. If intake air door moves freely, replace the

intake air door motor. Refer to 

VTL-20, "Removal and Installation"

.

NO

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

BLOWER MOTOR

HAC-115

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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BLOWER MOTOR

System Description

INFOID:0000000009478344

Component Parts

Blower speed control system components are:

• Front air control

• Variable blower control

• Front blower motor

• Front blower motor relay

System Operation

COMPONENT DESCRIPTION

Variable Blower Control

The variable blower control (1) is located on the heater and cooling

unit assembly. The variable blower control receives a gate voltage

from the front air control to steplessly maintain the blower motor volt-

age in the 0 to 5 volt range (approx.) 

⇒↓:front.

Front Blower Motor Component Function Check

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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-116, "Front Blower Motor Diagnosis Procedure"

.

AWIIA1209ZZ

AWIIA1225ZZ

HAC-116

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

BLOWER MOTOR

Front Blower Motor Diagnosis Procedure

INFOID:0000000009478346

Regarding Wiring Diagram information, refer to 

HAC-133, "Wiring Diagram - With Type 1"

.

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 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

AWIIA1784GB

Fuses are good.

2 - Ground

: Battery voltage

WJIA1331E

BLOWER MOTOR

HAC-117

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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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 E54 terminals 5,7 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-119, "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

5, 7 - Ground

: Battery voltage

WJIA1634E

3, 6 - 2

: Continuity should exist.

WJIA1333E

3, 6 - 4

: Continuity should exist.

AWIIA1212ZZ

2 - Ground

: Continuity should exist

AWIIA1227ZZ