Nissan Altima 2007-2012 Service Manual: Rear window defogger relay

Description

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

Component Function Check

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-11, "Diagnosis Procedure".

Diagnosis Procedure

1. CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT

1. Turn ignition switch ON.

2. Check voltage between BCM connector and ground.

Is the inspection result normal? YES >> Rear window defogger 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 connector (A) and fuse block (J/ B) connector (B).

Is the inspection result normal? YES >> GO TO 3

NO >> Repair or replace harness.

3. CHECK REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay.

Refer to DEF-12, "Component Inspection".

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

NO >> Replace rear window defogger relay.

4. 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 REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay.

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

NO >> Replace rear window defogger relay.

    Rear window defogger switch
    Description • 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 ...

    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 ...

    Other materials:

    Rear lh side power window alone does not operate
    Diagnosis Procedure 1. CHECK REAR POWER WINDOW SWITCH LH Check rear power window switch LH. Refer to PWC-110, "REAR POWER WINDOW SWITCH : Component Function Check". Is th e inspection result normal? YES >> GO TO 2 NO >> Repair or replace the malfunctioning parts. 2. ...

    Multiport fuel injection system
    System Diagram System Description INPUT/OUTPUT SIGNAL CHART *1: This sensor is not used to control the engine system under normal conditions. *2: This signal is sent to the ECM through CAN communication line. *3: ECM determines the start signal status by the signals of engine speed and ...

    Normal operating condition
    Description The majority of the audio concerns are the result of outside causes (bad CD, electromagnetic interference, etc.). NOISE The following noise results from variations in field strength, such as fading noise and multi-path noise, or external noise from trains and other sources. It i ...