2003 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK AUTO UP/DOWN FUNCTION 
    1. Check that the AUTO UP/DOWN function operates normally.

    NG: OTHER PROBLEM (See  AUTO UP/DOWN FUNCTION DOES NOT OPERATE  ) 

    OK: Go To Next Step 

  2. CHECK POWER WINDOW LOCK SWITCH 
    Fig 1: Checking Power Window Lock Switch
    G02835296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the window lock switch OFF and check that the remote UP/DOWN function operates normally.

    OK: END 

    NG: Go To Next Step 

  3. CHECK MANUAL UP/DOWN FUNCTION 
    1. Check that each door glass can be operated via each power window switch.

    NG: OTHER PROBLEM (See  PROBLEM SYMPTOMS TABLE  ) 

    OK: Go To Next Step 

  4. INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSY 
    Fig 2: Inspecting Power Window Regulator Master Switch Assy
    G02835297Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    Inspect the switch with which the remote function can not be operated.

    1. Remove the master switch.
    2. Check the continuity between the terminals of the master switch connector when the switch is operated.

    Standard: 

    Passenger switch 

    Fig 3: Passenger Switch Terminals Continuity Table
    G02835298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Rear RH switch 

    Fig 4: Rear RH Switch Terminals Continuity Table
    G02835299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Rear LH switch 

    Fig 5: Rear LH Switch Terminals Continuity Table
    G02835300Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSY 

    OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (MASTER SWITCH <=> EACH POWER WINDOW SWITCH) 

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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.