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Rear Window Defogger Circuit Check

  1. CHECK POWER SUPPLY CIRCUIT 
    1. Turn ignition switch ON.
    2. Check voltage between rear window defogger connector and ground.
    TERMINAL VOLTAGE CONDITION REFERENCE

    Terminals Condition of rear window defogger switch Voltage (V) (Approx.)
    (+) (-)
    Rear window defogger connector Terminal
    B604 1 Ground ON Battery voltage
    OFF 0
    Fig 1: Checking Voltage Between Rear Window Defogger Connector And Ground
    G04145684Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2.

    NG: GO TO  3.

  2. CHECK GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect rear window defogger connector.
    3. Check continuity between rear window defogger connector and ground.
    CONNECTOR TERMINAL CONTINUITY CHART

    Rear window defogger connector Terminal Ground Continuity
    B701 2 Yes
    Fig 2: Checking Continuity Between Rear Window Defogger Connector And Ground
    G04145685Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Check filament. Refer to "FILAMENT CHECK "

    • If filament is OK, check condition of harness and connector.
    • If filament is NG, repair filament.

    NG: Repair or replace harness between rear window defogger and ground.

  3. CHECK HARNESS CONTINUITY 1 
    1. Turn ignition switch OFF.
    2. Disconnect condenser and rear window defogger connector.
    3. Check continuity between condenser and rear window defogger connector.
    CONDENSER TERMINAL CONTINUITY CHART

    A B Continuity
    Condenser Terminal Rear window defogger connector Terminal
    1 B604 1 Yes
    Fig 3: Checking Continuity Between Condenser And Rear Window Defogger Connector
    G04145686Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG: Replace condenser.

  4. CHECK HARNESS CONTINUITY 2 
    1. Remove rear window defogger relay.
    2. Check continuity between rear window defogger relay connector and condenser connector.
    CONNECTOR TERMINAL CONTINUITY CHART

    A B Continuity
    Rear window defogger relay connector Terminal Condenser connector Terminal
    E36 5 B49 1 Yes
    7
    Fig 4: Checking Continuity Between Rear Window Defogger Relay Connector And Condenser Connector
    G04145687Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Check the condition of harness and connector.

    NG: Replace or repair harness between rear window defogger relay and condenser.

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