2005 Scion tC AutomaticFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK AUTO UP/DOWN FUNCTION (DRIVER SIDE) 
    1. Check that the power window AUTO UP/DOWN function operates normally.

    NG: Go to step 2 

    OK: REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSY 

  2. CHECK WIRE HARNESS (POWER WINDOW REGULATOR MASTER SWITCH ASSY - POWER WINDOW REGULATOR MOTOR ASSY LH) 
    1. Disconnect the P9 master switch connector.
    2. Disconnect the P10 motor connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard: 

      POWER WINDOW REGULATOR MOTOR ASSY LH TERMINAL RESISTANCE

      Tester Connection Specified Condition
      P9-1 (U) - P10-2 (U) Below 1 Ω
      P9-11 (D) - P10-1 (D) Below 1 Ω
      P9-1 (U) - Body ground 10 kΩ or higher
      P9-11 (D) - Body ground 10 kΩ or higher
      Fig 1: Measuring Resistance Of Wire Harness Side Connector
      G03065228Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: GO TO NEXT STEP 

  3. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSY 
    1. Remove the master switch but do not disconnect the connector.
    2. Turn the ignition switch ON.
    3. Measure the voltage of the connector.

      Standard: 

      POWER WINDOW REGULATOR MOTOR ASSY LH TERMINAL VOLTAGE

      Tester Connection Switch Condition Specified Condition
      P9-1 (U) - P9-2 (GND) UP 10 to 14 V
      P9-11 (D) - P9-2 (GND) DOWN 10 to 14 V
      Fig 2: Measuring Voltage Of Connector
      G03065229Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSY 

    OK: REPLACE POWER WINDOW REGULATOR MOTOR ASSY LH (DRIVER SIDE) 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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