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 MANUAL UP/DOWN FUNCTION (DRIVER SIDE) 
    1. Check that the door glass can be operated manually.

    NG: OTHER PROBLEM (See  MANUAL UP/DOWN FUNCTION DOES NOT OPERATE ON DRIVER SIDE  ) 

    OK: Go To Next Step 

  2. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSY 
    Fig 1: Checking Power Window Regulator Master Switch Assy
    G02835292Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch ON.
    2. Operate the power window switch on the driver side.
    3. Check the blinking pattern of the illumination as shown the illustration.
    Fig 2: Identifying Blinking Pattern Of Illumination
    G02835293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. If the switch indicates (1), proceed to A.
    2. If the switch indicates (2) or (3), proceed to B.
    3. If the switch indicates normal, proceed to C.

    B: Go to step   4 

    C: REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSY 

    A: Go To Next Step 

  3. RESET POWER WINDOW REGULATOR MOTOR (DRIVER SIDE) 
    1. Turn the ignition switch ON.
    2. Open the door glass.
    3. Fully pull up the AUTO switch of the power window master switch until the door glass is fully closed.
    4. Check that the AUTO UP/DOWN function operates normally.

    OK: END 

    NG: Go To Next Step 

  4. CHECK WIRE HARNESS (MASTER SWITCH <=> MOTOR) 
    1. Disconnect the D17 switch connector.
      2. Fig 3: Identifying D17 Switch Connector And P12 Motor Connector (Driver Side)
      G02835294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the P12 motor connector (driver side).
    3. Check the continuity between the wire harness side connectors.
    STANDARD

    Terminal No. Specified Condition
    D17-14 <=> P12-5 Continuity
    D17-17 <=> P12-3 Continuity
    D17-3 <=> P12-4 Continuity
    D17-2 <=> P12-6 Continuity
    D17-2 <=> P12-3 No continuity
    D17-2 <=> P12-4 No continuity
    D17-2 <=> P12-5 No continuity

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE POWER WINDOW REGULATOR MOTOR ASSY LH (DRIVER SIDE) 

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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.