2007 Lexus ES 350FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. INSPECT POWER WINDOW REGULATOR SWITCH 
    1. Disconnect the K4 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      2 (E) - 4 (A) - 5 (E) Auto UP Below 1 Ω
      2 (U) - 5 (E) Manual UP Below 1 Ω
      5 (E) - 10 (D) Manual DOWN Below 1 Ω
      4 (A) - 10 (D) - 5 (E) Auto DOWN Below 1 Ω
    Fig 1: Identifying K4 Connector Terminals
    G05253586Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER WINDOW REGULATOR SWITCH 

    OK: Go to Next Step 

  2. CHECK WIRE HARNESS (POWER WINDOW REGULATOR SWITCH - POWER WINDOW ECU) 
    1. Disconnect the K3 and K4 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      K3-4 (AUTO) - K4-4 (A) Always Below 1 Ω
      K3-5 (LED) - K4-8 (LED) Always Below 1 Ω
      K3-7 (DWN1) - K4-2 (U) Always Below 1 Ω
      K3-10 (UP1) - K4-10 (D) Always Below 1 Ω
      K3-4 (AUTO) - Body ground Always 10 kΩ or higher
      K3-5 (LED) - Body ground Always 10 kΩ or higher
      K3-7 (DWN1) - Body ground Always 10 kΩ or higher
      K3-10 (UP1) - Body ground Always 10 kΩ or higher
    Fig 2: Checking Wire Harness (Power Window Regulator Switch - Power Window ECU)
    G05253587Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: END 

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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.