2008 Lexus IS 350FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. INSPECT POWER WINDOW REGULATOR MOTOR 
    1. Remove the power window motor.
    2. Apply battery voltage to the motor connector according to the table below.
      NOTE: Do not apply battery voltage to any terminals except terminals 1 and 2.

      Standard 

      TERMINAL MEASUREMENT SPECIFIED CONDITION

      Measurement Condition Specified Condition
      Battery positive (+) → Terminal 2 (U)
      Battery negative (-) → Terminal 1 (D)      		 Motor gear rotates clockwise
      Battery positive (+) → Terminal 1 (D)
      Battery negative (-) → Terminal 2 (U)      		 Motor gear rotates counterclockwise
      3. Fig 1: Identifying Power Window Regulator Motor Operation
      G04967134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER WINDOW REGULATOR MOTOR 

    OK: Go to Next Step 

  2. CHECK WIRE HARNESS (WINDOW REGULATOR MOTOR MASTER SWITCH) - MULTIPLEX NETWORK 
    1. Disconnect the M7 and M3 connectors.
    2. Measure the resistance according to the value (s) in the table below.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      M7-1 (UP) - M3-2 (U) Always Below 1 Ω
      M7-11 (DN) - M3-1 (D) Always Below 1 Ω
      M7-1 (UP) - Body ground Always 10 kΩ or higher
      M7-11 (DN) - Body ground Always 10 kΩ or higher
      3. Fig 2: Identifying M7 And M3 Connector Terminals
      G05832848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

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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.