2009 Lexus LS 460 AWDFACTORY OEM SERVICE PROCEDURE

Engine Switch: Inspection

  1. INSPECT ENGINE SWITCH 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying Claws And Switch
      G04943938Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Switch Position Specified Condition
      7 (SS1) - 5 (GND) Not pushed 10 kΩ or higher
      2 (SS2) - 5 (GND) Not pushed 10 kΩ or higher
      7 (SS1) - 5 (GND) Pushed Below 1 Ω
      2 (SS2) - 5 (GND) Pushed Below 1 Ω
      Fig 2: Identifying Engine Switch Connector Terminal
      G04943939Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the result is not as specified, replace the engine switch.

    2. Apply battery voltage between the terminals of the switch, and check the illumination condition of the switch.

      HINT:

      • If the positive (+) lead and the negative (-) lead are incorrectly connected, the engine switch indicator will not illuminate.
      • If the voltage is too low, the indicator will not illuminate.

        OK 

        ITEM SPECIFICATION

        Measurement Condition Specified Condition
        Battery positive (+) → Terminal 11 (SWIL) Battery negative (-) → Terminal 4 (COM) or 5 (GND) Illuminates
        Battery positive (+) → Terminal 12 (INDS) Battery negative (-) → Terminal 4 (COM) or 5 (GND) Illuminates
        Battery positive (+) → Terminal 13 (INDW) Battery negative (-) → Terminal 4 (COM) or 5 (GND) Illuminates
        Fig 3: Identifying Engine Switch Connector Terminal
        G04943940Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If the result is not as specified, replace the engine 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.

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