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HOMESERVICE MANUALSLEXUS2010LS 460L AWDREPAIR AND DIAGNOSISELECTRICALSTARTERSMART ACCESS SYSTEM (KEYLESS START) (DIAGNOSTIC CODES & SYMPTOM TESTS)SMART ACCESS SYSTEM WITH PUSH-BUTTON STARTENGINE SWITCH INDICATOR CIRCUITPROCEDURE
2010 Lexus LS 460L AWD

Engine Switch Indicator Circuit: Procedure

2010 Lexus LS 460L AWDSECTION Procedure
  1. INSPECT ENGINE SWITCH 
    Fig 1: Identifying Engine Switch Connector
    GTY288216Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the engine switch. Refer to REMOVAL .
    2. Apply battery voltage between the terminals of the engine switch, and check the illumination condition of the engine switch indicator light.
      NOTE:
      • If the positive (+) lead and the negative (-) lead are incorrectly connected, the engine switch indicator light will not illuminate.
      • If the voltage is too low, the indicator light will not illuminate.

      OK

      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

    NG → See step   3 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND) 
    Fig 2: Identifying L36 Engine Switch Connector Terminal
    GTY261111Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L36 engine switch connector.
    2. Disconnect the L13 main body ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE MAIN BODY ECU 

  3. REPLACE ENGINE SWITCH. Refer to  REMOVAL 
RENDER: 1.0x

NO RELATED

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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.