2010 Scion tC AutomaticFACTORY OEM SERVICE PROCEDURE

Driver Side Power Window does not Operate with Power Window Master Switch: Procedure

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

    OK → REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY 

    NG: Go to next step 

  2. CHECK WIRE HARNESS (POWER WINDOW MASTER SWITCH - POWER WINDOW MOTOR) 
    Fig 1: Identifying P9 Master Switch And P10 Motor Connector Terminals
    GTY160733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P9 master switch connector.
    2. Disconnect the P10 motor connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard 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 kΩor higher
      P9-11 (D) - Body ground 10 kΩor higher

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  3. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY 
    Fig 2: Identifying Power Window Regulator Master Switch Connector Terminals
    GTY160668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 voltage

      Tester Connection Switch Condition Specified Condition
      P9-1 (U) - P9-2 (GND) UP 11 to 14 V
      P9-11 (D) - P9-2 (GND) DOWN 11 to 14 V

    NG → REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY 

    OK → REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY 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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