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Check Rear Window Defogger Circuit

  1. CHECK REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect rear window defogger connector.
    3. Turn ignition switch ON.
    4. Check voltage between rear window defogger connector and ground.
      REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT

      Connector Terminal (Wire color) Condition of rear window defogger switch Voltage [V] (Approx.)
      (+) (-)
      B181 2 (B) Ground ON Battery voltage
      OFF 0
      Fig 1: Checking Voltage Between Rear Window Defogger Connector And Ground
      G04129862Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO 2.
    • NG: GO TO  3.
  2. CHECK REAR WINDOW DEFOGGER GROUND HARNESS 
    1. Turn ignition switch OFF.
    2. Check continuity between rear window defogger connector B421 terminal 1 and ground.

      1 (B) - Ground: Continuity should exist 

      Fig 2: Checking Continuity Between Rear Window Defogger Connector B421 Terminal 1 And Ground
      G04129863Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: Check filament, refer to , "FILAMENT CHECK ".
      • If filament is OK, check the condition of the harness and the connector.
      • If filament is NG, repair filament.
    • NG: Repair or replace harness.
  3. CHECK CONDENSER POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect condenser connector.
    3. Turn ignition switch ON.
    4. Check voltage between condenser connector and ground.
      CONDENSER POWER SUPPLY CIRCUIT

      Connector Terminal (Wire color) Condition of rear window defogger switch Voltage [V] (Approx.)
      (+) (-)
      B25 1 (L/R) Ground ON Battery voltage
      OFF 0
      Fig 3: Checking Voltage Between Condenser Connector And Ground
      G04129864Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: Repair or replace harness.
    • NG: GO TO 4.
  4. CHECK CONDENSER HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect rear window defogger and door mirror defogger relay connector.
    3. Check continuity between condenser connector B25 terminal 1 and rear window defogger and door mirror defogger relay connector B8 terminal 7.

      1 (L/R) - 7 (L/R): Continuity should exist. 

      Fig 4: Checking Condenser Harness
      G04129865Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: Check the condition of the harness and the connector.
    • NG: Repair or replace harness.
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