Infiniti QX56 (JA60). Manual - part 598

BLOWER MOTOR CONTROL SYSTEM

HAC-49

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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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-69,

"Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 7.

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. Press the front blower control "+" switch 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 10.

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. Turn ignition switch ON.

4. 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.

AWIIA0174GB

Fuses are good.

2 - Ground

: Battery voltage

WJIA1331E

5 - Ground

: Battery voltage

WJIA1359E

HAC-50

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

4.

CHECK FRONT BLOWER MOTOR RELAY

Turn ignition switch OFF.

Check front blower motor relay. Refer to 

HAC-52, "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 FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY

1. Turn ignition switch ON.

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

nector M107 terminal 2 and ground.

Is the inspection result normal?

YES

>> Repair front blower motor ground circuit or connector.

NO

>> Repair harness or connector.

7.

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 8.

NO

>> Inspection End.

8.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

1. Turn ignition switch OFF.

2. Disconnect front blower motor connector, front blower motor

relay and variable blower control connector.

3. Check continuity between variable blower control harness con-

nector M122 terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair harness or connector.

9.

CHECK FRONT BLOWER MOTOR

Check front blower motor. Refer to 

HAC-52, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

3 - 2

: Continuity should exist.

WJIA1360E

2 - Ground

: Battery voltage

WJIA1363E

4 - Ground

: Continuity should not exist.

AWIIA0177ZZ

BLOWER MOTOR CONTROL SYSTEM

HAC-51

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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YES

>> Replace variable blower control (front). Refer to 

VTL-15, "Removal and Installation"

.

NO

>> Replace front blower motor. Refer to 

VTL-12, "Removal and Installation"

.

10.

CHECK FRONT BLOWER MOTOR

Check front blower motor. Refer to 

HAC-52, "Front Blower Motor Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace front blower motor. Refer to 

VTL-12, "Removal and Installation"

.

11.

CHECK BLOWER MOTOR GROUND CIRCUIT

1. Disconnect variable blower control connector.

2. Check continuity between front blower motor harness connector

M62 (B) terminal 1 and variable blower control harness connec-

tor M122 (A) terminal 2.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Repair harness or connector.

12.

CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN

1. Disconnect front blower motor relay.

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

nector M107 (A) terminals 3 and variable blower control harness

connector M122 (B) terminal 4.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair harness or connector.

13.

CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT

Check continuity between variable blower control harness connector

M122 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Repair harness or connector.

14.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT

1 - 2

: Continuity should exist.

AWIIA0179ZZ

3 - 4

: Continuity should exist.

AWIIA0175ZZ

1 - Ground

: Continuity should exist.

AWIIA0180ZZ

HAC-52

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

1. Reconnect all disconnected component connectors.

2. Disconnect A/C auto amp. connector.

3. Turn ignition switch ON.

4. Press the blower (+) switch to maximum speed.

5. Check voltage between A/C auto amp. harness connector M49

terminal 13 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> GO TO 15.

15.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT FOR OPEN

1. Disconnect variable blower control connector.

2. Check continuity between A/C auto amp. harness connector

M49 (B) terminal 13 and variable blower control harness con-

nector M122 (A) terminal 3.

Is the inspection result normal?

YES

>> Replace variable blower control. Refer to 

VTL-15,

"Removal and Installation"

.

NO

>> Repair harness or connector.

Front Blower Motor Component Inspection

INFOID:0000000005147703

COMPONENT INSPECTION 

Check continuity between terminals by supplying 12 volts and

ground to coil side terminals of relay.

Front Blower Motor

13 - Ground

: Approx. 4.5V

AWIIA1129ZZ

13 - 3

: Continuity should exist.

AWIIA0178ZZ

WJIA1401E