Nissan Pathfinder (2009 year). Manual - part 144

DEF-4

< FUNCTION DIAGNOSIS >

REAR WINDOW DEFOGGER SYSTEM

FUNCTION DIAGNOSIS

REAR WINDOW DEFOGGER SYSTEM

System Diagram

INFOID:0000000003935812

System Description

INFOID:0000000003935813

Operation Description

• Turn rear window defogger switch ON when the ignition switch is turned ON. Then A/C and AV switch

assembly (with auto A/C) or front air control (without auto A/C) transmits rear window defogger switch signal
to BCM.

• BCM transmits rear window defogger control signal to IPDM E/R and display unit (with auto A/C only) via

CAN communication when rear window defogger operates.

• IPDM E/R turns rear window defogger relay and heated mirror relay (if equipped) ON when rear window

defogger switch signal is received.

• Rear window defogger and door mirror defogger (if equipped) are supplied with power and operate when

rear window defogger relay and heated mirror relay (if equipped) turn ON.

• Rear window defogger ON is displayed when signal is received.

Timer function

• BCM turns rear window defogger relay and heated mirror relay (if equipped) ON for approximately 15 min-

utes when rear window defogger switch is turned ON while ignition switch is ON. It makes rear window
defogger and door mirror defogger (if equipped) operate.

• Timer is canceled after pressing rear window defogger switch again during timer operation. Then BCM turns

rear window defogger relay and heated mirror relay (if equipped) OFF. The same reaction also occurs during
timer operation, if the ignition switch is turned OFF. 

INPUT/OUTPUT SIGNAL CHART

AWLIA1675GB

Switch

Input signal to BCM

BCM function

Actuator

Rear window defogger switch

Defogger switch signal

Rear window defogger & door mirror 

defogger (if equipped) control

Rear window defogger

Door mirror defogger (if 

equipped)

Ignition switch

Ignition signal

2009 Pathfinder

REAR WINDOW DEFOGGER SYSTEM

DEF-5

< FUNCTION DIAGNOSIS >

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Component Parts Location

INFOID:0000000003935814

Component Description

INFOID:0000000003935815

ALJIA0229ZZ

1.

A. Steering column assembly
B. BCM M18, M20 (view with instru-
ment lower panel LH removed)

2.

Rear window defogger switch M98, 
M99 (with auto A/C) or M52 (without 
auto A/C) 

3.

A. Rear window defogger ground 
connector D604
B. Rear window defogger connector 
D651

4.

IPDM E/R E120, E122, E124

5.

Door mirror (door mirror defogger) 
LH D4 (w/o ADP), D18 (with ADP) 
RH D107 (w/o ADP), D118 (with 
ADP) (if equipped)

BCM

• Operates the rear window defogger with the operation of rear window defogger switch.
• Performs the timer control of rear window defogger.

Rear window defogger relay

• Operates the rear window defogger and the door mirror defogger (if equipped) with the control 

signal from BCM.

Rear window defogger switch

• The rear window defogger switch is turned ON.
• Turns the indicator lamp ON when detecting the operation of rear window defogger.

Rear window defogger

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

the rear window from fogging up.

Door mirror defogger (if 
equipped)

• Heats the heating wire with the power supply from the heated mirror relay to prevent the door 

mirror from fogging up.

2009 Pathfinder

DEF-6

< FUNCTION DIAGNOSIS >

DIAGNOSIS SYSTEM (BCM)

DIAGNOSIS SYSTEM (BCM)

COMMON ITEM

COMMON ITEM : CONSULT-III Function (BCM - COMMON ITEM)

INFOID:0000000004393997

APPLICATION ITEM

CONSULT-III performs the following functions via CAN communication with BCM.

SYSTEM APPLICATION

BCM can perform the following functions for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.

1: With remote keyless entry system

2: With Intelligent Key

REAR WINDOW DEFOGGER

Diagnosis mode

Function Description

WORK SUPPORT

Changes the setting for each system function.

SELF-DIAG RESULTS

Displays the diagnosis results judged by BCM. Refer to 

BCS-54, "DTC Index"

.

CAN DIAG SUPPORT MNTR

Monitors the reception status of CAN communication viewed from BCM.

DATA MONITOR

The BCM input/output signals are displayed.

ACTIVE TEST

The signals used to activate each device are forcibly supplied from BCM.

ECU IDENTIFICATION

The BCM part number is displayed.

CONFIGURATION

• Enables to read and save the vehicle specification.
• Enables to write the vehicle specification when replacing BCM.

System

Sub system selection item

Diagnosis mode

WORK SUPPORT

DATA MONITOR

ACTIVE TEST

BCM

BCM

×

Door lock

DOOR LOCK

×

×

×

Rear window defogger

REAR DEFOGGER

×

Warning chime

BUZZER

×

×

Interior room lamp timer

INT LAMP

×

×

×

Remote keyless entry system

1

MULTI REMOTE ENT

×

×

×

Exterior lamp

HEAD LAMP

×

×

×

Wiper and washer

WIPER

×

×

×

Turn signal and hazard warning lamps

FLASHER

×

×

Air conditioner

AIR CONDITONER

×

Intelligent Key system

2

INTELLIGENT KEY

×

Combination switch

COMB SW

×

Immobilizer

IMMU

×

×

Interior room lamp battery saver

BATTERY SAVER

×

×

×

Back door open

TRUNK

×

×

RAP (retained accessory power)

RETAINED PWR

×

×

×

Signal buffer system

SIGNAL BUFFER

×

×

TPMS (tire pressure monitoring sys-
tem)

AIR PRESSURE MONITOR 

×

×

×

Vehicle security system

PANIC ALARM

×

2009 Pathfinder

DIAGNOSIS SYSTEM (BCM)

DEF-7

< FUNCTION DIAGNOSIS >

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REAR WINDOW DEFOGGER : CONSULT-III Function (BCM - REAR DEFOGGER)

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DATA MONITOR

Monitor Item

[Unit]

Description

IGN ON SW [ON/OFF]

Indicates condition of ignition switch in ON position

IGN ACC SW [ON/OFF]

Indicates condition of ignition switch in ACC position

REAR DEF SW [ON/OFF]

Displays “Press (ON)/other (OFF)” status determined with the rear window defogger switch

2009 Pathfinder

DEF-8

< COMPONENT DIAGNOSIS >

REAR WINDOW DEFOGGER SWITCH

COMPONENT DIAGNOSIS

REAR WINDOW DEFOGGER SWITCH

Description

INFOID:0000000003935819

• The rear window defogger is operated by turning the rear window defogger switch ON.
• Turns the indicator lamp in the rear window defogger switch ON when operating the rear window defogger.

Component Function Check

INFOID:0000000003935820

1.

 CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION

Check that the indicator lamp of rear window defogger illuminates with rear window defogger switch ON.

Is the inspection result normal?

YES

>> Rear window defogger switch function is OK.

NO

>> Refer to 

DEF-8, "Diagnosis Procedure A/C and AV Switch Assembly"

 (with auto A/C) or 

DEF-8,

"Diagnosis Procedure Front Air Control"

 (without aut A/C).

Diagnosis Procedure A/C and AV Switch Assembly

INFOID:0000000003935821

1.

 CHECK A/C AND AV SWITCH ASSEMBLY (REAR WINDOW DEFOGGER SWITCH) CIRCUIT

Does rear window defogger switch operate normally?
Is the inspection result normal?

YES

>> Inspection End.

NO

>> GO TO 2

2.

 CHECK HARNESS CONTINUITY

1.

Turn ignition switch OFF.

2.

Disconnect BCM and A/C and AV switch assembly.

3.

Check continuity between BCM connector (A) and A/C and AV switch assembly connector (B).

W/MID AUDIO SYSTEM OR W/BOSE AUDIO SYSTEM-W/O NAVI 

W/BOSE AUDIO SYSTEM-W/NAVI 

4.

Check continuity between BCM connector (A) and ground.

Is the inspection result normal?

YES

>> Replace A/C and AV switch assembly. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair or replace harness.

Diagnosis Procedure Front Air Control

INFOID:0000000003935822

1.

 CHECK FRONT AIR CONTROL (REAR WINDOW DEFOGGER SWITCH) CIRCUIT

Does rear window defogger switch operate normally?

Is the inspection result normal?

YES

>> Inspection End.

NO

>> GO TO 2

BCM connector

Terminal

A/C and AV switch 

assembly connector

Terminal

Continuity 

M18 (A)

9

M98 (B)

16

Yes

BCM connector

Terminal

A/C and AV switch 

assembly connector

Terminal

Continuity 

M18 (A)

9

M99 (B)

16

Yes

ALLIA0315ZZ

BCM connector

Terminal

Ground

Continuity

M18 (A)

9

No

2009 Pathfinder

REAR WINDOW DEFOGGER SWITCH

DEF-9

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2.

 CHECK HARNESS CONTINUITY

1.

Turn ignition switch OFF.

2.

Disconnect BCM and front air control.

3.

Check continuity between BCM connector and front air control
connector.

4.

Check continuity between BCM connector and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

NO

>> Repair or replace harness.

BCM connector

Terminal

Front air control    

connector

Terminal

Continuity 

M18

9

M52

11

Yes

BCM connector

Terminal

Ground

Continuity

M18

9

No

LIIA2047E

2009 Pathfinder

DEF-10

< COMPONENT DIAGNOSIS >

REAR WINDOW DEFOGGER RELAY

REAR WINDOW DEFOGGER RELAY

Description

INFOID:0000000003935823

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

Component Function Check

INFOID:0000000003935824

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-10, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003935825

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-33, "Removal and Installation of IPDM E/R"

.

NO

>> GO TO 3

3.

 CHECK INTERMITTENT INCIDENT

Check intermittent incident.
Refer to 

GI-49, "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

2009 Pathfinder

REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

DEF-11

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REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000003935826

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

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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-11, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003935828

1.

 CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch ON.

2.

Press the rear window defogger switch.

3.

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 

D651

1

Ground

ON

Battery voltage

OFF

0

ALLIA0177ZZ

Rear window defogger connector

Terminal

Ground

Continuity 

D604

2

Yes

ALLIA0178ZZ

2009 Pathfinder