2007 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Power Window Master Switch: Inspection

  1. INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY 
    1. Using an electrical tester, check if the diodes are functioning normally.

      Standard resistance 

      for Driver switch 

      ITEM CONTENT REFERENCE CHART

      Tester Connection Switch Position Specified Condition
      6 (PW) - 16 (AUTO) AUTO UP Below 50 Ω
      6 (PW) - 20 (DUP)
      6 (PW) - 20 (DUP) MANUAL UP Below 50 Ω
      - OFF -
      6 (PW) - 11 (DDN) MANUAL DOWN Below 10 Ω
      6 (PW) - 16 (AUTO) AUTO DOWN Below 10 Ω
      6 (PW) - 11 (DDN) Below 50 Ω
      Fig 1: Identifying Power Window Master Switch Assembly Connector Terminals
      G05293453Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the result is not as specified, replace the master switch assembly.

    2. Using an electrical tester, check if the diodes are functioning normally.

      HINT:

      • As the switch has diodes, a resistance inspection cannot be performed. Use the tester's diode check function to check the diodes.
      • Connect the tester's leads as shown in the table below. If the leads are not connected correctly, the readings will not be accurate. Connect the tester's positive (+) lead to the diode's positive (+) side, and the negative (-) lead to the diode's negative (-) side.
      1. Set the function selector switch to diode check function mode, and check that the diodes are functioning normally.

        for Passenger switch 

        TESTER CONNECTION SPECIFIED CONDITION

        Switch Position Tester Connection Positive Side Tester Connection Negative Side
        AUTO UP 3 (DT1) 14 (SC2)
        15(SC3)
        MANUAL UP 3(DT1) 14 (SC2)
        OFF - -
        MANUAL DOWN 3 (DT1) 13 (SC1)
        AUTO DOWN 3 (DT1) 13 (SC1)
        15 (SC3)

        Reference voltage (for TOYOTA electrical tester) 

        TEST LEAD SPECIFIED CONDITION

        Test Lead Specified Condition
        Normal direction 0.4 to 0.8 V

        If the result is not as specified, replace the master switch assembly.

    3. Check the window lock switch.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Window Lock Switch Condition Specified Condition
      6 (PW) - 7 (W/L) LOCK 10 kΩ or higher
      6 (PW) - 7 (W/L) UNLOCK Below 1 Ω

      If the result is not as specified, replace the master switch assembly.

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  • • You smell fuel, burning insulation, or see smoke.
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  • • 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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