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Home >> Nissan-Datsun >> 2009 >> Versa Base, Automatic >> Repair and Diagnosis >> Body & Frame >> Windows >> Glass, Window System & Mirrors >> Rear Window Defogger >> Rear Window Defogger Switch Circuit Inspection

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.
      TERMINALS VOLTAGE CHART

      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
      G04814887Courtesy 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. 

    OK or NG 

    OK >> GO TO 3.

    NG >> Repair or replace harness.

    Fig 2: Checking Continuity Between BCM Connector Terminal 9 And Ground
    G04814888Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK REAR WINDOW DEFOGGER SWITCH 

    Check continuity between front air control terminals.

    TERMINALS CONTINUITY CHART

    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
    G04814889Courtesy 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.

    TERMINALS CONTINUITY CHART

    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 Terminal 8 And Ground
    G04814890Courtesy 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 And Ground
    G04814887Courtesy of NISSAN MOTOR CO., U.S.A.
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