Infiniti QX56 (JA60). Manual - part 198

REAR WINDOW DEFOGGER RELAY

DEF-9

< COMPONENT DIAGNOSIS >

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REAR WINDOW DEFOGGER RELAY

Description

INFOID:0000000005146827

Power is supplied to the rear window defogger with BCM control.

Component Function Check

INFOID:0000000005146828

1.

 CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT

Check that an operation noise of rear window defogger relay (located in IPDM E/R) can be heard when turning

the rear window defogger switch ON.
Is the inspection result normal?

YES

>> Rear window defogger relay power supply circuit is OK.

NO

>> Refer to 

DEF-9, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005146829

Regarding Wiring Diagram information, refer to 

DEF-27, "Wiring Diagram"

. 

1.

CHECK FUSES 

Check if any of the following fuses in the IPDM E/R are blown.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

2.

 CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT

1. Turn ignition switch ON.

2. Check voltage between IPDM E/R connector and ground.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-35, "Removal and Installation of IPDM E/R"

.

NO

>> GO TO 3

3.

 CHECK INTERMITTENT INCIDENT

Check intermittent incident.

Refer to 

GI-38, "Intermittent Incident"

Is the inspection result normal?

YES

>> Check the following.

• Battery power supply circuit.

• IPDM E/R.

NO

>> Repair or replace the malfunctioning parts.

COMPONENT PARTS

AMPERE

FUSE NO.

IPDM E/R

15A

46

IPDM E/R

15A

47

Terminals

Condition of rear 

window defogger 

switch

Voltage (V)

(Approx.)

(+)

(–)

IPDM E/R con-

nector

Terminal 

E124

60

Ground

ON Battery 

voltage

OFF

0

LIIA2190E

DEF-10

< COMPONENT DIAGNOSIS >

REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000005146830

Heats the heating wire with the power supply from the rear window defogger relay to prevent the rear window

from fogging up.

Component Function Check

INFOID:0000000005146831

1.

 CHECK REAR WINDOW DEFOGGER

Check that the heating wire of rear window defogger is heated when turning the rear window defogger switch

ON.
Is the inspection result normal?

YES

>> Rear window defogger is OK.

NO

>> Refer to 

DEF-10, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005146832

Regarding Wiring Diagram information, refer to 

DEF-27, "Wiring Diagram"

. 

1.

 CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch ON.

2. Check voltage between rear window defogger connector and

ground.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> GO TO 3

2.

 CHECK GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect rear window defogger.

3. Check continuity between rear window defogger connector and

ground.

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Repair or replace harness.

3.

 CHECK HARNESS CONTINUITY

Terminals

Condition of rear 

window

 defogger switch

Voltage (V)

(Approx.)

(+)

(–)

Rear window 

defogger 

connector

Terminal 

D406

1

Ground

ON

Battery voltage

OFF

0

ALLIA0177ZZ

Rear window defogger connector

Terminal

Ground

Continuity 

D604

2

Yes

ALLIA0178ZZ

REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

DEF-11

< COMPONENT DIAGNOSIS >

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1. Disconnect IPDM E/R.

2. Check continuity between rear window defogger connector (A)

and IPDM E/R connector (B).

3. Check continuity between rear window defogger connector (A)

and ground.

Is the inspection result normal?

YES

>> GO TO 5

NO

>> Replace or repair harness.

4.

 CHECK FILAMENT

Check filament.

Refer to 

DEF-45, "Filament Check"

.

Is the inspection result normal?

YES

>> Refer to 

GI-38, "Intermittent Incident"

.

NO

>> Repair filament. Refer to 

DEF-45, "Filament Repair"

.

5.

 CHECK INTERMITTENT INCIDENT

Check intermittent incident.

Refer to 

GI-38, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Check the following.

• Battery power supply circuit.

• IPDM E/R.

NO

>> Repair or replace the malfunctioning parts.

Component Inspection

INFOID:0000000005146833

1.

 CHECK FILAMENT

Check the filament for damage or open circuits.

Refer to 

DEF-45, "Filament Check"

.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair filament. Refer to 

DEF-45, "Filament Repair"

.

Rear window defog-

ger connector

Terminal

IPDM E/R 
connector

Terminal

Continuity 

D406 (A)

1

E124 (B)

60

Yes

Rear window defog-

ger connector

Terminal

Ground

Continuity 

D406 (A)

1

No

LIIA2644E

DEF-12

< COMPONENT DIAGNOSIS >

DOOR MIRROR DEFOGGER LH

DOOR MIRROR DEFOGGER LH

Description

INFOID:0000000005146834

Heats the heating wire with the power supply from the rear window defogger relay to prevent the door mirror

from fogging up.

Component Function Check

INFOID:0000000005146835

1.

 CHECK DOOR MIRROR DEFOGGER LH

Check that heating wire of door mirror defogger LH is heated when turning the rear window defogger switch

ON.
Is the inspection result normal?

YES

>> Door mirror defogger is OK.

NO

>> Refer to 

DEF-12, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005146836

Regarding Wiring Diagram information, refer to 

DEF-27, "Wiring Diagram"

. 

1.

 CHECK POWER SUPPLY

Check if the following fuse in the IPDM E/R is blown.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

2.

 CHECK DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT

Check voltage between IPDM E/R connector and ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Replace IPDM E/R. Refer to 

PCS-35, "Removal and Installation of IPDM E/R"

.

3.

 CHECK DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT 2

1. Turn ignition switch OFF.

2. Disconnect door mirror LH.

3. Turn ignition switch ON.

4. Check voltage between door mirror LH connector and ground.

COMPONENT PARTS

AMPERE

FUSE NO.

IPDM E/R

15A

43

Connector

Terminal

Condition

Voltage (V)

(Approx.)

(+)

(-)

E120

23

Ground

Rear window defogger 
switch ON

 Battery voltage

Rear window defogger 
switch OFF

0

LIIA2049E

Connector

Terminal

Condition

Voltage (V)

(Approx.)

(+)

(-)

LIIA1456E