2008 Lexus IS 250 AWDFACTORY OEM SERVICE PROCEDURE

Fail-Safe Chart

  1. CHECK POWER WINDOW FAIL-SAFE FUNCTION 

    HINT:

    If there is a malfunction in the power window system, some of the power window functions will be disabled.

    Driver side power window 

    FAIL-SAFE CHART

    Malfunctioning Part Disabled Function Operative Function
    Pulse sensor circuit in power window motor
    • AUTO UP/DOWN function
    • Power window operation function after engine switch is turned off
    • Manual UP (fully pulled UP position)
    • Manual DOWN
    • Remote (AUTO and manual)
    • Remote function after engine switch is turned off (AUTO and manual)
    CPU in power window master switch
    • AUTO UP/DOWN function
    • Remote function (AUTO and manual)
    • Manual UP (fully pulled UP position)
    • Manual DOWN

    Power windows except driver side power window 

    FAIL-SAFE CHART

    Malfunctioning Part Disabled Function Operative Function
    • Pulse sensor circuit in power window motor
    • CPU in power window master switch
    • Communication between master switch and each power window switch
    • AUTO UP/DOWN function
    • Power window operation function after engine switch is turned off
    • Manual UP (fully pulled UP position)
    • Manual DOWN
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.