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Rear Window Defogger Power Supply Circuit Check

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE 
    • Check 10A fuse [No. 12, located in the fuse block (J/B)]
    • Check 20A fuse (No. 75, located in the IPDM E/R)
    • Check 20A fuse (No. 80, located in the IPDM E/R)
    NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION  ".

    OK or NG

    1. OK: GO TO 2.
    2. NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to POWER DISTRIBUTION .
  2. CHECK 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.
      VOLTAGE CHECK CHART

      Connector Terminals (Wire color) Voltage (V)
      (Approx.)
      (+) (-)
      B8 1 (G) Ground Battery voltage
      3 (L)
      6 (W)
      Fig 1: Checking Voltage Between Rear Window Defogger Relay Connector And Ground
      G03491729Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 3.
    2. NG: Repair or replace harness between fuse block (J/B) or IPDM E/R and rear window defogger relay.
  3. CHECK REAR WINDOW DEFOGGER RELAY 

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

    CONTINUITY CHECK CHART

    Terminal 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 Terminals 3 And 5, 6 And 7
    G03491730Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 4.
    2. NG: Replace rear window defogger relay.
  4. CHECK GROUND CIRCUIT 
    1. Installation rear window defogger relay.
    2. Turn ignition switch ON.
    3. Check voltage between IPDM E/R connector and ground.
      VOLTAGE CHECK CHART

      Connector Terminals (Wire color) Condition Voltage (V)

      (Approx.)
      (+) (-)
      E9 52 (G/R) 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
      G03491731Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: Rear window defogger power supply circuit check is OK.
    2. NG: GO TO 5.
  5. CHECK HARNESS CONTINUITY 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R connector and rear window defogger relay.
    3. Check continuity between IPDM E/R connector E9 terminal 52 and rear window defogger relay connector B8 terminal 2.

      52 (G/R) - 2 (G/R): Continuity should exist. 

      Fig 4: Checking Continuity Between IPDM E/R Connector E9 Terminal 52 And Rear Window Defogger Relay Connector B8 Terminal 2
      G03491732Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 6.
    2. NG: Repair or replace harness between IPDM E/R and rear window defogger relay.
  6. CHECK REAR WINDOW DEFOGGER RELAY OUTPUT SIGNAL 
    1. Connect IPDM E/R and rear window defogger relay.
    2. Turn ignition switch ON.
    3. Check voltage between IPDM E/R connector E9 terminal 52 and ground.

      52 (G/R) - Ground: Battery voltage 

      Fig 5: Checking Voltage Between IPDM E/R Connector E9 Terminal 52 And Ground
      G03491733Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: Replace IPDM E/R.
    2. NG: Check the condition of the harness and the connector.
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