DTC B2278: Engine Switch Circuit Malfunction: Description
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
This DTC is output when 1) a malfunction is detected between the power source control ECU and the engine switch, or 2) either of the switches inside the engine switch is malfunctioning
HINT
When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.
DTC DETECTION CONDITION CHART
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B2278 | Communication is abnormal between the power source control ECU and engine switch or the engine switch is defective |
|