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Rear Window Defogger Power Supply Circuit Inspection

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE 

    Check if any of the following fuses in fuse block (J/B) and IPDM E/R are blown.

    FUSE BLOCK (J/B) AND IPDM E/R SIGNAL SPEECHIFICATION

    COMPONENT PARTS TERMINAL NO. (SIGNAL) AMPERE FUSE NO.
    Fuse block (J/B) 2P (Ignition power supply) 10A 12
    IPDM E/R 5 (Battery power supply) 20A 37
    6 (Battery power supply) 20A 32

    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 "HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT ".

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

      Connector Terminals Voltage (V) (Approx.)
      (+) (-)
      B4 1 Ground Battery voltage
      3
      6
      Fig 1: Checking Voltage Between Rear Window Defogger Relay Connector And Ground
      G04907543Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace harness.

  3. CHECK REAR WINDOW DEFOGGER RELAY 

    Check continuity between rear window defogger relay terminals 3 and 5, 6 and 7.

    REAR WINDOW DEFOGGER RELAY

    Terminals Condition Continuity
    3 5 12V direct current supply between terminals 1 and 2 Yes
    No current supply No
    6 7 12V direct current supply between terminals 1 and 2 Yes
    No current supply No
    Fig 2: Checking Continuity Between Rear Window Defogger Relay Terminals 3 And 5, 6 And 7
    G04877433Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG: Replace rear window defogger relay.

  4. CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT 
    1. Install rear window defogger relay.
    2. Turn ignition switch ON.
    3. Check voltage between IPDM E/R connector and ground.
      REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT

      Connector Terminals Condition Voltage (V) (Approx.)
      (+) (-)
      E121 52 Ground When rear window defogger switch ON 0
      When rear window defogger switch OFF Battery voltage
      Fig 3: Checking Voltage Between IPDM E/R Connector And Ground
      G04917185Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Rear window defogger power supply circuit check is OK.

    NG: GO TO 5.

  5. CHECK IPDM E/R HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R and rear window defogger relay.
    3. Check continuity between IPDM E/R connector E121 terminal 52 and rear window defogger relay connector B4 terminal 2.

      52 - 2: Continuity should exist. 

    Fig 4: Checking Continuity Between IPDM E/R Connector Terminal 52 And Rear Window Defogger Relay Connector Terminal 2
    G04917186Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

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

    NG: Repair or replace harness.

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