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.
2005 Toyota Avalon XLSFACTORY OEM SERVICE PROCEDURE
Smart Key System DTCS
SMART KEY SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B1242 | WIRELESS DOOR LOCK TUNER CIRCUIT MALFUNCTION |
| B278A | IMMOBILIZER POWER SOURCE CHARGE MALFUNCTION (VC5 GND SHORT) |
| B2784 | ANTENNA COIL OPEN/SHORT |
| B2785 | COMMUNICATION MALFUNCTION BETWEEN ECU CONNECTED BY LIN |
| B2786 | NO RESPONSE FROM STEERING LOCK ECU |
| B2789 | NO RESPONSE FROM ID BOX |
| B2790 | MALFUNCTION OF ID-BOX (EEP ROM PROBLEM) |
| B2791 | COMMUNICATION FAILURE BETWEEN EFI ECU |
| B2799 | IMMOBILIZER MALFUNCTION |
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.