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Diagnosis Procedure

  1. CHECK BCM OUTPUT SIGNAL 
    1. Turn the power supply mode of the electric motor switch to ON.
    2. Check signal between BCM harness connector and ground using an oscilloscope.
      (+) (-) Signal
      BCM
      Connector Terminal
      M18 24 Ground
      G16912642Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Is the inspection result normal? 

    YES: GO TO  3.

    NO: GO TO  2.

  2. CHECK LIN COMMUNICATION CIRCUIT 
    1. Electric motor switch OFF, and then wait for 3 minutes with driver door open.
      NOTE:
      • Even after electric motor switch OFF, power is supplied to accessories for a certain amount of time by the AUTO ACC function  .
      • When vehicle is operated while on standby, power may be supplied to accessories  .
    2. Disconnect following connectors.
      • BCM
      • Power window main switch
      • Front power window motor (driver side)
      • Passenger door mirror control module
      • Sunroof motor assembly
      • Sunshade motor assembly Connecting parts other than power window.
    3. Check continuity between BCM harness connector and ground.
      BCM - Continuity
      Connector Terminal
      M18 24 Ground Not existed

    Is the inspection result normal? 

    YES: Replace BCM. Refer to REMOVAL AND INSTALLATION .

    NO: Repair or replace harness.

  3. CHECK LIN COMMUNICATION SIGNAL 
    1. Electric motor switch OFF, and then wait for 3 minutes with driver door open.
      NOTE:
      • Even after electric motor switch OFF, power is supplied to accessories for a certain amount of time by the AUTO ACC function  .
      • When vehicle is operated while on standby, power may be supplied to accessories  .
    2. Disconnect following connectors.
      • Power window main switch
      • Front power window motor (driver side)
    3. Turn the power supply mode of the electric motor switch to ON.
    4. Check signal between power window main switch harness connector, front power window motor (driver side) harness connector and ground using an oscilloscope.
      (+) (-) Signal
      Connector Terminal
      Power window main switch D6 4 Ground
      G16912643Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Front power window motor (driver side) D10 6

    Is the inspection result normal? 

    YES: INSPECTION END

    NO-1: Power window main switch:

    GO TO  4.

    NO-2: Front power window motor (driver side):

    GO TO  5.

  4. CHECK LIN COMMUNICATION CIRCUIT (POWER WINDOW MAIN SWITCH) 
    1. Turn the power supply mode of the electric motor switch to OFF.
    2. Disconnect BCM connector.
    3. Check continuity between BCM harness connector and power window main switch harness connector.
      BCM Power window main switch Continuity
      Connector Terminal Connector Terminal
      M18 24 D6 4 Existed

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Repair or replace harness.

  5. CHECK LIN COMMUNICATION CIRCUIT [FRONT POWER WINDOW MOTOR (DRIVER SIDE)] 
    1. Turn the power supply mode of the electric motor switch to OFF.
    2. Disconnect BCM connector.
    3. Check continuity between BCM harness connector and front power window motor (driver side) harness connector.
      BCM Front power window motor (driver side) Continuity
      Connector Terminal Connector Terminal
      M18 24 D10 6 Existed

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Repair or replace harness.

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