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Rear Window Defogger Power Supply Circuit Check

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

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

    FUSE REFERENCE

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

    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 "POWER SUPPLY ROUTING CIRCUIT ".

  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.
      TERMINAL VOLTAGE CHART

      Connector Terminals Voltage (V) (Approx.)
      (+) (-)
      B4 1 Ground Battery voltage
      3
      6
      Fig 1: Checking Voltage Between Rear Window Defogger Relay Connector Terminals 1, 3 & 6 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.

    TERMINAL CONTINUITY REFERENCE CHART

    Terminals Condition Continuity
    6 7 12V direct current supply between terminals 1 and 2 Yes
    No current supply No
    3 5 12V direct current supply between terminals 1 and 2 Yes
    No current supply No
    Fig 2: Identifying Rear Window Defogger Relay Terminals
    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 E121 terminal 52 and ground.
      TERMINAL VOLTAGE CHART

      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 E121 Terminal 52 And Ground
      G04907545Courtesy 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 PIDM E/R connector E121 (A) terminal 52 and rear window defogger relay connector B4 (B) terminal 2.

      52 - 2 : Continuity should exist. 

    OK or NG 

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

    NG: Repair or replace harness.

    Fig 4: Checking Continuity Between IPDM E/R Terminal 52 And Rear Window Defogger Relay Terminal 2
    G04907546Courtesy of NISSAN MOTOR CO., U.S.A.
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