2007 Lexus IS 350FACTORY OEM SERVICE PROCEDURE

Diagnosis System

  1. DESCRIPTION 
    1. Data of the system can be read from the Data Link Connector 3 (DLC3) of the vehicle. Therefore, when the system seems to be malfunctioning, use the intelligent tester to check for a malfunction and repair it.
  2. CHECK DLC3 
    1. The vehicle's ECM uses ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
    Fig 1: Identifying DLC3 Connector Terminal
    G04021879Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard 

    TESTER CONNECTION SPECIFIED CONDITION TABLE

    Tester Connection Condition Specified Condition
    7 (Bus + line) - 5 (Signal ground) During communication Pulse generation
    4 (Chassis ground) - Body ground Always Below 1 ohms
    5 (Signal ground) - Body ground Always Below 1 ohms
    16 (B+) - Body ground Always 9 to 14 V

    HINT:

    If the screen displays a communication error message after you have connected the cable of the intelligent tester to the DLC3, turned the engine switch on (IG) and used the intelligent tester, the problem may be on the vehicle side or tester side.

    • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
    • If communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in the tester's instruction manual.
  3. INSPECT BATTERY VOLTAGE 
    1. Check the battery voltage.

      Standard voltage: 11 to 14 V 

      If the voltage is below 11 V, replace the battery before proceeding.

  4. CHECK DIAGNOSIS 

    HINT:

    If there is a malfunction in the pulse sensor, manually operating the power window switch will cause the power window switch light to blink. The light continues to blink for 43 seconds or until the engine switch is turned off. After 43 seconds, the power window switch light remains on.

    Fig 2: Identifying Pulse Sensor
    G04050711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the engine switch on (IG).
    2. Manually operate the power window master switch or power window switch at each door.
    3. Check the blinking pattern of the AUTO light.
      1. If pattern (A) is displayed, reset the power window regulator motor.
      2. If pattern (B) or (C) is displayed, check the wire harness.
      3. If the normal pattern is displayed, replace the multiplex network master switch.
    Fig 3: Checking Blinking Pattern Of AUTO Light
    G04050712Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Factory Service Tools

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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.

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