Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2007ES 350REPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSENGINE IMMOBILIZER
2007 Lexus ES 350
Engine Immobilizer
2007 Lexus ES 350SECTION Engine Immobilizer
- Engine Immobilizer System
- Precaution
- Parts Location
- System Diagram
- System Description
- How To Proceed With Troubleshooting
- Registration
- Problem Symptoms Table
- Terminals Of Ecu
- Diagnosis System
- DTC Check / Clear
- Data List / Active Test
- Diagnostic Trouble Code Chart
- DTC B2784 Antenna Coil Open / Short
- DTC B2785 Communication Malfunction between ECUs Connected by LIN
- DTC B2786 No Response from Steering Lock ECU
- DTC B2789 No Response from ID BOX
- DTC B278A Short to GND in Immobilizer System Power Source Circuit
- DTC B2790 ID BOX EEPROM Malfunction
- DTC B2791 Communication Condition Failure between ECM
- DTC B2799 Engine Immobilizer System Malfunction
- ID Code Box Power Source Circuit
- Certification ECU Power Source Circuit
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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.