2008 Lexus LS 600hLFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. INSPECT POWER SWITCH 
    1. Disconnect the L36 power switch connector
    2. Apply battery voltage between the terminals of the power switch, and check the illumination condition of the power switch indicator light.
      NOTE:
      • If the positive (+) lead and the negative (-) lead are incorrectly connected, the power switch indicator light will not illuminate.
      • If the voltage is too low, the indicator light will not illuminate.

      OK 

      BATTERY VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      Battery terminal (+) → Terminal 11 (SWIL) - Battery terminal (-) → Terminal 5 (GND) Always Illuminates
      Battery terminal (+) → Terminal 12 (INDS) - Battery terminal (-) → Terminal 5 (GND) Always Illuminates
      Battery terminal (+) → Terminal 13 (INDW) - Battery terminal (-) → Terminal 5 (GND) Always Illuminates
      Fig 1: Identifying Power Switch Terminals
      G05780704Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SWITCH  (See REMOVAL  )

    OK: Go to next Step 

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - POWER SWITCH, BODY GROUND) 
    Fig 2: Identifying L13 Main Body ECU And L36 Power Switch Connectors
    G05780705Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L13 main body ECU connector.
    2. Disconnect the L36 power switch connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      L13-25 (SWIL) - L36-11 (SWIL) Always Below 1 Ω
      L13-15 (INDS) - L36-12 (INDS) Always Below 1 Ω
      L13-14 (INDW) - L36-13 (INDW) Always Below 1 Ω
      L36-5 (GND) - Body ground Always Below 1 Ω
      L13-25 (SWIL) or L36-11 (SWIL) - Body ground Always 10 kΩ or higher
      L13-15 (INDS) or L36-12 (INDS) - Body ground Always 10 kΩ or higher
      L13-14 (INDW) or L36-13 (INDW) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAIN BODY ECU 

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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.