DTC B278A: Short to GND in Immobilizer System Power Source Circuit: Description
WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
- Operating the engine switch starts the engine or changes the power source status (ACC / IG / OFF / START).
- The engine switch is a momentary type switch which turns on only while the switch is held down. The certification ECU always stores the power source status (OFF / ACC / ON). If the battery has been removed and reinstalled, the power source status maintained before removal is restored.
- The transponder amplifier is built into the engine switch.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B278A | If the certification ECU detects an open or short circuit in the power supply line (terminal VC5) to the transponder amplifier built into the engine switch, this DTC is stored. |
|