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Home › Infiniti › 2009 › M45 Base › Repair and Diagnosis › Body & Frame › Windows › Glass, Window System & Mirrors › Service Information › Rear Window Defogger › Check Rear Window Defogger Power Supply Circuit

Check Rear Window Defogger Power Supply Circuit

  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 

      OK: GO TO 2.

      NG: If fuse is blown out, be sure to eliminate cause of malfunction before installing new fuse, refer to POWER SUPPLY ROUTING CIRCUIT .

  2. CHECK POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Remove rear window defogger relay.
    3. Turn ignition switch ON.
    4. Check voltage between rear window defogger relay connector and ground.
      VOLTAGE SPECIFICATION

      Terminals Voltage (V) (Approx.)
      (+) (-)
      Rear window defogger relay connector Terminal
      E36 1 Ground Battery voltage
      3
      6
      Fig 1: Checking Voltage Between Rear Window Defogger Relay Connector And Ground
      G05212661Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: GO TO 3.

      NG: Repair or replace harness between fuse block (J/B) and rear window defogger relay.

  3. CHECK REAR WINDOW DEFOGGER RELAY

    Check rear window defogger relay.

    CONTINUITY SPECIFICATION

    Terminal Condition Continuity
    Rear window defogger relay
    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. Turn ignition switch OFF.
    2. Install rear window defogger relay.
    3. Turn ignition switch ON.
    4. Check voltage between IPDM E/R connector and ground.
      VOLTAGE SPECIFICATION

      Terminals Condition of rear window defogger switch Voltage (V) (Approx.)
      (+) (-)
      IPDM E/R connector Terminal
      E9 57 Ground ON (pressed) 0
      OFF Battery voltage

      OK or NG 

      OK: Rear window defogger power supply circuit is OK.

      NG: GO TO 5.

      Fig 3: Checking Voltage Between IPDM E/R Connector And Ground
      G05212663Courtesy of NISSAN MOTOR CO., U.S.A.
  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 and rear window defogger relay connector.
      CONTINUITY SPECIFICATION

      A B Continuity
      IPDM E/R connector Terminal Rear window defogger relay connector Terminal
      E9 57 E36 2 Yes

      OK or NG 

      OK: GO TO 6.

      NG: Repair or replace harness.

      Fig 4: Checking Continuity Between IPDM E/R Connector And Rear Window Defogger Relay Connector
      G05212664Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK REAR WINDOW DEFOGGER RELAY OUTPUT SIGNAL
    1. Connect IPDM E/R connector and rear window defogger relay.
    2. Turn ignition switch ON.
    3. Check voltage between IPDM E/R connector and ground.
      VOLTAGE SPECIFICATION

      Terminals Voltage (V) (Approx.)
      (+) (-)
      IPDM E/R connector Terminal
      E9 57 Ground Battery voltage

      OK or NG 

      OK: Check condition of harness and connector.

      NG: Replace IPDM E/R.

      Fig 5: Checking Voltage Between IPDM E/R Connector And Ground
      G05212663Courtesy of NISSAN MOTOR CO., U.S.A.
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