Infiniti QX56 (Z62). Manual - part 381

DEF-34

< DTC/CIRCUIT DIAGNOSIS >

WIPER DEICER

WIPER DEICER

Component Function Check

INFOID:0000000006299454

1.

CHECK WIPER DEICER

1.

Select Active Test (“REAR DEFOGGER”) mode of “BCM” using CONSULT-III.

2.

Touch “ON”.

3.

Check that the front window heating wire is getting warmer.

Is the inspection result normal?

YES

>> Wiper deicer is OK.

NO

>> Refer to 

DEF-34, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000006299455

1.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check 15 A fuse [No.75, located in fuse block (J/B)]

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

2.

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch ON.

2.

Check voltage between wiper deicer harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect wiper deicer connector.

3.

Check continuity between wiper deicer harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness between rear window defogger and ground.

4.

CHECK WIPER DEICER CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect wiper deicer relay connector and wiper deicer connector.

3.

Check continuity between wiper deicer relay harness connector and wiper deicer harness connector.

(+)

(–)

Condition 

Voltage (V)

(Approx.)

Wiper deicer

Connector

Terminal 

E40

1

Ground

Rear window defogger switch: ON

Battery voltage

Rear window defogger switch: OFF

0

Wiper deicer 

Ground

Continuity 

Connector

Terminal

E40

2

Existed

WIPER DEICER

DEF-35

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

M

A

B

DEF

N

O

P

4.

Check continuity between wiper deicer relay harness connector and ground.

Is the inspection result normal?

YES

>> Repair or replace harness between wiper deicer relay and fuse.

NO

>> Repair or replace harness between wiper deicer relay and wiper deicer.

5.

CHECK WIPER DEICER

 Check wiper deicer.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace windshield glass.

6.

CHECK INTERMITTENT INCIDENT

Check intermittent incident.
Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Wiper deicer relay

Wiper deicer

Continuity 

 Connector

Terminal

Connector

Terminal

E23

5

E40

1

Existed

Wiper deicer relay

Ground

Continuity 

Connector

Terminal

E23

5

Not existed

Wiper deicer 

Continuity 

Connector

Terminal

E40

1

2

Existed

DEF-36

< SYMPTOM DIAGNOSIS >

REAR WINDOW DEFOGGER DOES NOT OPERATE

SYMPTOM DIAGNOSIS

REAR WINDOW DEFOGGER DOES NOT OPERATE

Diagnosis Procedure

INFOID:0000000006299456

1.

CHECK REAR WINDOW DEFOGGER SWITCH

Check rear window defogger switch.
Refer to 

DEF-25, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning parts.

2.

CHECK REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay. 
Refer to 

DEF-26, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the malfunctioning parts.

3.

CHECK REAR WINDOW DEFOGGER

Check rear window defogger.
Refer to 

DEF-27, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace the malfunctioning parts.

4.

CONFIRM THE OPERATION

Confirm the operation again.
Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> GO TO 1.

REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER DO NOT OPER-

ATE.

DEF-37

< SYMPTOM DIAGNOSIS >

C

D

E

F

G

H

I

J

K

M

A

B

DEF

N

O

P

REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER DO NOT
OPERATE.

Diagnosis Procedure

INFOID:0000000006299457

1.

CHECK REAR WINDOW DEFOGGER SWITCH

Check rear window defogger switch.
Refer to 

DEF-25, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning parts.

2.

CHECK REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay. 
Refer to 

DEF-26, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the malfunctioning parts.

3.

CHECK REAR WINDOW DEFOGGER

Check rear window defogger.
Refer to 

DEF-27, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace the malfunctioning parts.

4.

CONFIRM THE OPERATION

Confirm the operation again.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> GO TO 1.