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Rear Window Defogger Switch Circuit Inspection

  1. CHECK REAR WINDOW DEFOGGER SWITCH OPERATION

    With CONSULT-III 

    Check ("REAR DEF SW", "IGN ON SW") in DATA MONITOR mode with CONSULT-III.

    When rear window defogger switch is turned to ON 

    REAR DEF SW : ON 

    When ignition switch is turned to ON 

    IGN ON SW : ON 

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check voltage between BCM connector and ground.
      VOLTAGE SPECIFICATION

      Connector Terminals Condition Voltage (V) (Approx.)
      (+) (-)
      M18 9 Ground Rear window defogger switch is pressed 0
      Rear window defogger switch is released 5
      Fig 1: Checking Voltage Between BCM Connector And Ground
      G04913034Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: Rear window defogger switch check is OK.

      NG: GO TO 2.

  2. CHECK REAR WINDOW DEFOGGER SWITCH CIRCUIT HARNESS CONTINUITY
    1. Turn ignition switch OFF.
    2. Disconnect BCM and front air control.
    3. Check continuity between BCM connector M18 (A) terminal 9 and front air control connector M33 (B) terminal 3.

      9 - 3 : Continuity should exist  .

    4. Check continuity between BCM connector M18 (A) terminal 9 and ground

      9 - Ground : Continuity should not exist  .

      Fig 2: Checking Continuity Between BCM Connector M18 (A) Terminal 9 And Ground
      G06547030Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: GO TO 3.

      NG: Repair or replace harness.

  3. CHECK REAR WINDOW DEFOGGER SWITCH

    Check continuity between front air control terminals.

    CONTINUITY SPECIFICATION

    Terminals Condition Continuity
    3 8 Rear window defogger switch is ON (pressed) Yes
    Rear window defogger switch is OFF (released) No
    Fig 3: Checking Continuity Between Front Air Control Terminals
    G06547031Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG: Replace front air control. Refer to "REMOVAL AND INSTALLATION ".

  4. CHECK REAR WINDOW DEFOGGER SWITCH GROUND

    Check continuity between front air control connector M33 terminal 8 and ground.

    CONTINUITY SPECIFICATION

    Connector Terminal Ground Continuity
    M33 8 Yes

    OK or NG 

    OK: GO TO 5.

    NG: Repair or replace harness.

    Fig 4: Checking Continuity Between Front Air Control Connector M33 Terminal 8 And Ground
    G06547032Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK BCM OUTPUT SIGNAL
    1. Connect BCM.
    2. Turn ignition switch ON.
    3. Check voltage between BCM connector M18 terminal 9 and ground.

      9 - Ground : Approx. 5V 

      OK or NG 

      OK: Replace front air control. Refer to CONTROLLER .

      NG: Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".

      Fig 5: Checking Voltage Between BCM Connector M18 Terminal 9 And Ground
      G04913034Courtesy of NISSAN MOTOR CO., U.S.A.
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