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.
2012 Toyota Avalon BaseFACTORY OEM SERVICE PROCEDURE
Smart Key System
CERTIFICATION ECU DTC IDENTIFICATION
| DTC Code | Description |
|---|---|
| B1242 | Wireless Door Lock Tuner Circuit Malfunction |
| B2784 | Antenna Coil Open / Short |
| B2785 | Communication Malfunction between ECUs Connected by LIN |
| B2786 | No Response from Steering Lock ECU |
| B2789 | No Response from ID BOX |
| B278A | Short to GND in Immobiliser System Power Source Circuit |
| B2790 | ID BOX EEPROM Malfunction |
ECU DTC IDENTIFICATION
| DTC Code | Description |
|---|---|
| B2799 | Engine Immobiliser System Malfunction |
| B279A | Theft Deterrent System Communication Line High Fixation |
| B279C | Theft Deterrent System Presence Detection |
Factory Service Tools
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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.
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