Nissan Pathfinder. Manual - part 302

REAR WINDOW DEFOGGER SWITCH

DEF-27

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

M

A

B

DEF

N

O

P

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-157, "Removal and Installation"

.

NO

>> Repair or replace harness.

5.

CHECK A/C AUTO AMP. (REAR WINDOW DEFOGGER SWITCH) FUNCTION

1. Check (“REAR DEF SW”) in BCM - REAR DEFOGGER “DATA MONITOR” mode by using CONSULT.

2. Operate rear window defogger switch and check the status on CONSULT screen.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 6.

6.

 CHECK REAR WINDOW DEFOGGER ON SIGNAL CIRCUIT

Check voltage between BCM connector and ground.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-80, "Removal and Installation"

.

NO

>> GO TO 7.

7.

 CHECK HARNESS CONTINUITY

1. Push ignition switch to OFF.

2. Disconnect BCM and front air control.

3. Check continuity between BCM connector and A/C auto amp.

4. Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-157, "Removal and Installation"

.

NO

>> Repair or replace harness.

8.

 CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT

(+)

(–)

Condition

Voltage (V)

(Approx.)

A/C auto amp.

 Connector

Terminal 

M50

35

Ground

Rear window de-

fogger switch 

ON Battery 

voltage

OFF 0

Monitor Item

Condition

status

REAR DEF SW

Rear window defogger 
switch

Pressed

On

Released

Off

(+)

(–)

Condition

Voltage (V)

(Approx.)

BCM

 Connector

Terminal 

M18

32

Ground

Rear window de-

fogger switch 

ON 0

OFF 5

BCM

A/C auto amp.

Continuity 

Connector

Terminal

Connector

Terminal

M18 32

M50

15

Yes

BCM

Ground

Continuity

Connector

Terminal

M18

32

No

DEF-28

< DTC/CIRCUIT DIAGNOSIS >

REAR WINDOW DEFOGGER SWITCH

CONSULT

1. Select BCM (REAR DEFOGGER) ACTIVE TEST.

2. Turn REAR DEFOGGER active test ON and OFF.

3. Check voltage between fuse block (J/B) connector and ground.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 9.

9.

 CHECK REAR WINDOW DEFOGGER RELAY CIRCUIT

Check voltage between fuse block (J/B) connector and ground.

Is the inspection result normal?

YES

>> Replace rear window defogger relay.

NO

>> GO TO 10.

10.

 CHECK HARNESS CONTINUITY

1. Push ignition switch to OFF.

2. Disconnect BCM and fuse block (J/B).

3. Check continuity between BCM connector and fuse block (J/B) connector.

4. Check continuity between fuse block (J/B) connector M5 terminal 6P and ground.

Is the inspection result normal?

YES

>> Perform rear window defogger relay component inspection. Refer to 

DEF-32, "Component

Inspection"

. If OK, replace BCM. Refer to 

BCS-80, "Removal and Installation"

.

NO

>> Repair or replace harness.

11.

 CHECK REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay.

Refer to 

DEF-32, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace rear window defogger relay.

12.

 CHECK INTERMITTENT INCIDENT

(+)

(–)

Condition

Voltage (V)

(Approx.)

Fuse block (J/B)

 Connector

Terminal 

M4

6P

Ground

Rear window de-

fogger active test 

ON 0

OFF Battery 

voltage

(+)

(–)

Condition

Voltage (V)

(Approx.)

Fuse block (J/B)

 Connector

Terminal 

M4

6P

Ground

Rear window de-

fogger switch 

ON 0

OFF Battery 

voltage

BCM

Fuse block (J/B)

Continuity 

Connector

Terminal

Connector

Terminal

M19 61

M4

6P

Yes

Fuse block (J/B)

Ground

Continuity

Connector

Terminal

M4

6P

No

REAR WINDOW DEFOGGER SWITCH

DEF-29

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

M

A

B

DEF

N

O

P

Check intermittent incident.

Refer to 

GI-49, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Check the following.

• Battery power supply circuit.

• Fuse block (J/B).

NO

>> Repair or replace the malfunctioning parts.

EXCEPT BASE AUDIO SYSTEM

1.

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

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

YES

>> Inspection End.

NO

>> GO TO 2.

2.

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

1. Turn ignition switch ON.

2. Check voltage between A/C and AV switch assembly harness connector M98 terminal 3 and ground.

Is the inspection result normal?

YES

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

HAC-155, "Removal and Installation - With Navi-

gation"

.

NO

>> GO TO 3.

3.

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

1. Turn ignition switch OFF.

2. Disconnect accessory relay-2 connector E22.

3. Disconnect A/C and AV switch assembly connector M98.

4. Check continuity between A/C and AV switch assembly connector M98 terminal 3 and accessory relay-2

connector E22 terminal 5.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair and replace harness.

4.

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

SHORT 

1. Turn ignition switch OFF.

2. Disconnect accessory relay-2 connector E22.

3. Disconnect A/C and AV switch assembly connector M98.

4. Check continuity between A/C and AV switch assembly connector M98 terminal 3 and ground.

(+)

(–)

Condition

Voltage (V)

(Approx.)

A/C and AV switch assembly

 Connector

Terminal 

M98

3

Ground

Ignition switch 

ON Battery 

voltage

OFF 0

A/C and AV switch assembly

Accessory relay-2

Continuity 

Connector

Terminal

Connector

Terminal

M98 3

E22

5

Yes

A/C and AV switch assembly

Ground

Continuity

Connector

Terminal

M98

3

No

DEF-30

< DTC/CIRCUIT DIAGNOSIS >

REAR WINDOW DEFOGGER SWITCH

Is the inspection result normal?

YES

>> Check the following:

• Accessory relay-2.

• Battery power supply circuit.

NO

>> Repair or replace harness.