Nissan Maxima. Manual - part 306

DIAGNOSIS SYSTEM (BCM)

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< SYSTEM DESCRIPTION >

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

INFOID:0000000010065032

DATA MONITOR

ACTIVE TEST

Monitor Item [Unit]

Description

PUSH SW [On/Off]

Indicates condition of push button ignition switch

REAR DEF SW [On/Off]

Indicates condition of rear window defogger switch

Test Item

Description

REAR DEFOGGER

This test is able to check rear window defogger operation [Off/On].

DEF-10

< DTC/CIRCUIT DIAGNOSIS >

REAR WINDOW DEFOGGER SWITCH

DTC/CIRCUIT DIAGNOSIS

REAR WINDOW DEFOGGER SWITCH

Description

INFOID:0000000010045579

• 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:0000000010045580

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-10, "Diagnosis Procedure"

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Diagnosis Procedure

INFOID:0000000010045581

Regarding Wiring Diagram information, refer to 

DEF-46, "Wiring Diagram"

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1.

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

Check A/C auto amp. operation.
Is the inspection result normal?

YES

>> Inspection End.

NO

>> GO TO 2

2.

CHECK REAR WINDOW DEFOGGER SWITCH REQUIRE SIGNAL 

1. Turn ignition switch ON.

2. Check voltage between A/C auto amp. harness connector M37 terminal 27 and ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> GO TO 4

3.

 CHECK REAR WINDOW DEFOGGER SWITCH REQUIRE SIGNAL CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp harness connector M37.

3. Disconnect BCM harness connector M18.

4. Check continuity between A/C auto amp harness connector M37 terminal 27 and BCM harness connector

M18 terminal 38.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-79, "Removal and Installation"

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NO

>> Repair and replace harness.

Terminals

Condition of rear window de-

fogger switch

Voltage (V)

(Approx.)

(+)

(–)

A/C auto amp. connector

Terminal 

M37

27

Ground

ON 0

OFF

5

BCM connector

Terminal

A/C auto amp. connector

Terminal

Continuity 

M18 38

M37

27

Yes

REAR WINDOW DEFOGGER SWITCH

DEF-11

< DTC/CIRCUIT DIAGNOSIS >

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4.

 CHECK REAR WINDOW DEFOGGER SWITCH REQUIRE SIGNAL CIRCUIT FOR SHORT 

1. Turn ignition switch OFF.

2. Disconnect BCM harness connector M18.

3. Disconnect A/C auto amp harness connector M37.

4. Check continuity between BCM harness connector M18 terminal 38 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp.

• With color display, refer to 

HAC-100, "Removal and Installation"

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• With monochrome display, refer to 

HAC-203, "Removal and Installation"

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NO

>> Repair or replace harness.

BCM connector

Terminal

Ground

Continuity 

M18

38

No

DEF-12

< DTC/CIRCUIT DIAGNOSIS >

REAR WINDOW DEFOGGER RELAY

REAR WINDOW DEFOGGER RELAY

Description

INFOID:0000000010045582

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

Component Function Check

INFOID:0000000010045583

1.

 CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT

Check that an operation noise of rear window defogger relay [located in fuse block (J/B)] 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-12, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010045584

Regarding Wiring Diagram information, refer to 

DEF-46, "Wiring Diagram"

.

1.

 CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT

1. Turn ignition switch ON.

2. Check voltage between BCM harness connector M18 terminal

59 and ground.

Is the inspection result normal?

YES

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

NO

>> GO TO 2

2.

 CHECK HARNESS CONTINUITY

1. Turn ignition switch OFF.

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

3. Check continuity between BCM harness connector M18 (A) ter-

minal 59 and fuse block (J/B) harness connector M4 (B) terminal

4Q.

4. Check continuity between BCM harness connector M18 (A) ter-

minal 59 and ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace harness.

Terminals

Condition of rear 

window defogger 

switch

Voltage (V)

(Approx.)

(+)

(–)

BCM connector

Terminal 

M18

59

Ground

ON 0

OFF

Battery voltage

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BCM connector

Terminal

Fuse block (J/B) 

connector

Terminal

Continuity 

M18 (A)

59

M4 (B)

4Q

Yes

BCM connector

Terminal

Ground

Continuity 

M18 (A)

59

No

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