Nissan Altima 2007-2012 Service Manual: Rear window defogger power supply and ground circuit

Description

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

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-13, "Diagnosis Procedure".

Diagnosis Procedure

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 5

NO >> Repair or replace harness.

3. CHECK HARNESS CONTINUITY 1

1. Turn ignition switch OFF.

2. Disconnect condenser and rear window defogger.

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

Is the inspection result normal? YES >> GO TO 4

NO >> Replace condenser. Refer to DEF-66, "Removal and Installation - Coupe" or DEF-66, "Removal and Installation - Sedan".

4. CHECK HARNESS CONTINUITY 2

1. Disconnect fuse block (J/B).

2. Check continuity between fuse block (J/B) connector (A) and condenser connector (B).

Is the inspection result normal? YES >> GO TO 6

NO >> Replace or repair harness.

5. CHECK FILAMENT

Check filament.

Refer to DEF-14, "Component Inspection".

Is the inspection result normal? YES >> Refer to GI-42, "Intermittent Incident".

NO >> Repair filament. Refer to DEF-64, "Inspection and Repair".

6. CHECK INTERMITTENT INCIDENT

Check intermittent incident.

Refer to GI-42, "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.

Component Inspection

1. CHECK FILAMENT

Check the filament for damage or open circuits.

Refer to DEF-64, "Inspection and Repair".

Is the inspection result normal? YES >> Inspection End.

NO >> Repair filament. Refer to DEF-64, "Inspection and Repair".

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