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Rear Window Defogger Circuit Check: Notes

WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSES 

    Check if any of the fuses in IPDM E/R are blown. Refer to "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) ".

    OK or NG 

    OK: GO TO 2.

    NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) ".

  2. CHECK REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect rear window defogger.
    3. Turn ignition switch ON.
    4. Check voltage between rear window defogger connector D651 terminal + and ground.
    CONNECTOR TERMINAL VOLTAGE CHART

    Connector Terminals Condition Voltage (V) (Approx.)
    (+) (-)
    D651 + Ground Rear window defogger switch ON. Battery voltage
    Rear window defogger switch OFF. 0
    Fig 1: Checking Voltage Between Rear Window Defogger Connector D651 Terminal + And Ground
    G04205728Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG: GO TO  4.

  3. CHECK REAR WINDOW DEFOGGER GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check continuity between rear window defogger connector D604 terminal - and ground.

      - - Ground: Continuity should exist  .

    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.

    Fig 2: Checking Continuity Between Rear Window Defogger Connector D604 Terminal - And Ground
    G04205729Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK REAR WINDOW DEFOGGER RELAY OUTPUT SIGNAL 

    Check voltage between IP DM E/R and ground.

    CONNECTOR TERMINAL VOLTAGE CHART

    Connector Terminals Condition Voltage (V) (Approx.)
    (+) (-)
    IPDM E/R: E124 60 Ground Rear window defogger switch ON. Battery voltage
    Rear window defogger switch OFF. 0
    Fig 3: Checking Voltage Between IP DM E/R And Ground
    G04205730Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Repair or replace harness.

    NG: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

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