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.
2007 Lexus IS 350FACTORY OEM SERVICE PROCEDURE
Engine Immobilizer DTCS
ENGINE IMMOBILIZER DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | Reference |
|---|---|---|
| B2784 | Antenna Coil Open / Short | DTC B2784 ANTENNA COIL OPEN/SHORT |
| B2785 | Communication Malfunction between ECUs Connected by LIN | DTC B2785: COMMUNICATION MALFUNCTION BETWEEN ECUS CONNECTED BY LIN |
| B2786 | No Response from Steering Lock ECU | DTC B2786: NO RESPONSE FROM STEERING LOCK ECU |
| B2789 | No Response from ID BOX | DTC B2789: NO RESPONSE FROM ID BOX |
| B278A | Short to GND in Immobilizer System Power Source Circuit | DTC B278A SHORT TO GND IN IMMOBILIZER SYSTEM POWER SOURCE CIRCUIT |
| B2790 | ID BOX EEPROM Malfunction | DTC B2790 ID BOX EEPROM MALFUNCTION |
| B2791 | Communication Condition Failure between ECM | DTC B2791 COMMUNICATION CONDITION FAILURE BETWEEN ECM |
| B2799 | Engine Immobilizer System | DTC B2799 ENGINE IMMOBILIZER SYSTEM |
Factory Service Tools
Use the Manual With the Right Hardware
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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.