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HOMESERVICE MANUALSLEXUS2010LS 460L AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 10 (ENGINE IMMOBILISER (DIAGNOSTICS - INTRODUCTION))ENGINE IMMOBILIZER SYSTEMDIAGNOSTIC TROUBLE CODE CHARTDIAGNOSTIC TROUBLE CODE CHART
2010 Lexus LS 460L AWD

Diagnostic Trouble Code Chart

2010 Lexus LS 460L AWDSECTION Diagnostic Trouble Code Chart
WARNING: This page is about a different car, the 2010 Lexus GS 450h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CERTIFICATION ECU DTC CHART 

    HINT: 

    If a trouble code is displayed during the DTC check, check the circuit listed for that code in the table below. Then proceed to the appropriate article.

    CERTIFICATION ECU:

    DTC Code Detection Item Trouble Area See
    B2784 Antenna Coil Open / Short - Certification ECU
    - Power switch    		 Refer to DTC B2784: Antenna Coil Open / Short
    B2785 Communication Malfunction between ECUs Connected by LIN - Wire harness
    - Certification ECU
    - Power source control ECU
    - Steering lock actuator (steering lock ECU)
    - ID code box    		 Refer to DTC B2785: Communication Malfunction between ECUs Connected by LIN
    B2786 No Response from Steering Lock ECU - Wire harness
    - Certification ECU
    - Steering actuator (steering lock ECU)    		 Refer to DTC B2786: No Response from Steering Lock ECU
    B2789 No Response from ID BOX - Wire harness
    - ID code box
    - Certification ECU    		 Refer to DTC B2789: No Response from ID BOX
    B278A Short to GND in Immobilizer System Power Source Circuit - Wire harness
    - Power switch
    - Certification ECU    		 Refer to DTC B278A: Short to GND in Immobilizer System Power Source Circuit
    B2790 ID BOX EEPROM Malfunction ID code box Refer to DTC B2790: ID BOX EEPROM Malfunction
  2. HYBRID VEHICLE CONTROL ECU DTC CHART 

    HINT: 

    The DTCs for the immobilizer system are specified above. If other codes are output, check the DTC chart for the hybrid control system.

    HYBRID VEHICLE CONTROL ECU:

    DTC Code Detection Item Trouble Area See
    B2799-542 Engine Immobilizer System Malfunction - Wire harness
    - ID code box
    - Hybrid vehicle control ECU    		 Refer to DTC B2799-542: Engine Immobilizer System Malfunction; DTC B2799-790: Engine Immobilizer System Malfunction
    B2799-790 Engine Immobilizer System Malfunction - Wire harness
    - ID code box
    - Hybrid vehicle control ECU    		 Refer to DTC B2799-542: Engine Immobilizer System Malfunction; DTC B2799-790: Engine Immobilizer System Malfunction
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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.