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Rear Window Defogger Circuit Check

WARNING: This page is about a different car, the 2003 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT 1 
    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.
      Fig 1: Terminal Condition Voltage Table
      G02057492Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Checking Voltage Between Rear Window Defogger Connector And Ground
      G02057493Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2.

    NG: GO TO  3 .

  2. CHECK REAR WINDOW DEFOGGER GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check continuity between rear window defogger connector B451 terminal 1 and ground.
      1. 1(B) - Ground: Continuity should exist 
      Fig 3: Checking Continuity Between Rear Window Defogger Connector B451 Terminal 1 And Ground
      G02057494Courtesy 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 between rear window defogger and ground.

  3. CHECK REAR WINDOW DEFOGGER POWER WINDOW SUPPLY CIRCUIT 2 
    1. Turn ignition switch OFF.
    2. Disconnect condenser connector.
    3. Turn ignition switch ON.
    4. Check voltage between condenser connector and ground.
      Fig 4: Terminal Condition Specified Voltage Chart
      G02057495Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Checking Voltage Between Condenser Connector And Ground
      G02057496Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Repair or replace harness between condenser and rear window defogger.

    NG: GO TO 4.

  4. CHECK CONDENSER HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect rear window defogger relay.
    3. Check continuity between rear window defogger relay connector B417 terminal 5 and condenser connector B416 terminal 1.
      1. 5 (L) - 1 (L): Continuity should exist. 
      Fig 6: Checking Condenser Harness (Terminal 5-1)
      G02057497Courtesy 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 rear window defogger relay and condenser.

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