2008 Lexus GS 450hFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK POWER WINDOW CONTROL SYSTEM (WINDOW LOCK SWITCH) 
    1. Check that the front passenger side power window switch and rear window switches are disabled when the window lock switch of the power window master switch is pressed.

      OK: 

      Front passenger side power window switch and rear window switches are disabled. 

    2. Check that the front passenger side power window switch and rear window switches operate when the window lock switch is pressed again.

      OK: 

      Front passenger side power window switch and rear window switches can be operated. 

      Fig 1: Identifying Window Lock Switch
      G05820369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step 2 

    OK: END 

  2. READ VALUE USING TECHSTREAM (MASTER SWITCH) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG) and turn the Techstream ON.
    3. Select the following menu items: Body / Master Switch / Data List.
    4. Read the Data List according to the display on the Techstream.

      Master Switch 

      DATA LIST

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      P Door P/W Auto SW Front passenger side power window AUTO UP / DOWN switch signal / ON or OFF ON: Front passenger side power window switch is operated (AUTO operation)
      OFF: Front passenger side power window switch is not operated      		 -
      RL Door P/W Auto SW Rear LH power window AUTO UP / DOWN switch signal / ON or OFF ON: Rear LH power window switch is operated (AUTO operation)
      OFF: Rear LH power window switch is not operated      		 -
      RR Door P/W Auto SW Rear RH power window AUTO UP / DOWN switch signal / ON or OFF ON: Rear RH power window switch is operated (AUTO operation)
      OFF: Rear RH power window switch is not operated      		 -
      P Door P/W Up SW Front passenger side power window MANUAL UP switch signal / ON or OFF ON: Front passenger side power window switch is operated (MANUAL UP operation)
      OFF: Front passenger side power window switch is not operated      		 -
      RL Door P/W Up SW Rear LH power window MANUAL UP switch signal / ON or OFF ON: Rear LH power window switch is operated (MANUAL UP operation)
      OFF: Rear LH power window switch is not operated      		 -
      RR Door P/W Up SW Rear RH power window MANUAL UP switch signal / ON or OFF ON: Rear RH power window switch is operated (MANUAL UP operation)
      OFF: Rear RH power window switch is not operated      		 -
      P Door P/W Down SW Front passenger side power window MANUAL DOWN switch signal / ON or OFF ON: Front passenger side power window switch is operated (MANUAL DOWN operation)
      OFF: Front passenger side power window switch is not operated      		 -
      RL Door P/W Down SW Rear LH power window MANUAL DOWN switch signal / ON or OFF ON: Rear LH power window switch is operated (MANUAL DOWN operation)
      OFF: Rear LH power window switch is not operated      		 -
      RR Door P/W Down SW Rear RH power window MANUAL DOWN switch signal / ON or OFF ON: Rear RH power window switch is operated (MANUAL DOWN operation)
      OFF: Rear RH power window switch is not operated      		 -
      Window Lock Switch Status Window lock switch signal / ON or OFF ON: Window lock switch LOCK position
      OFF: Window lock switch UNLOCK position      		 -

      OK: 

      Tester display changes in accordance with power window master switch is operation. 

    NG: REPLACE POWER WINDOW MASTER SWITCH  (See REMOVAL )

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (POWER WINDOW MASTER SWITCH - EACH MOTOR) 
    1. Disconnect the Q13 switch connector.
    2. Disconnect the M13, O12 and O11 motor connectors.
      Fig 2: Identifying Power Window Master Switch Connector Terminals
      G05820370Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      for Front Passenger Side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      Q13-10 (LIN1) - M13-9 (LIN) Always Below 1 Ω
      Q13-10 (LIN1) - Body ground Always 10 kΩ or higher

      for Rear LH Side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      Q13-10 (LIN1) - O12-9 (LIN) Always Below 1 Ω
      Q13-10 (LIN1) - Body ground Always 10 kΩ or higher

      for Rear RH Side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      Q13-10 (LIN1) - O11-9 (LIN) Always Below 1 Ω
      Q13-10 (LIN1) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (APPLICABLE LOCATION) 

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.