DTC B2278: Engine/Power Switch Malfunction [06/2018 - ]: Description
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
This DTC is stored when the SSW1 contact signal and SSW2 contact signal, which are detected when the power switch is operated, do not match.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| B2278 | Engine/Power Switch Malfunction | When the power switch is operated, the SSW1 contact signal and SSW2 contact signal do not match (1-trip detection logic*). |
|
DTC Output Confirmation Operation:
|
- *: Only detected while a malfunction is present.
VEHICLE CONDITION AND FAIL-SAFE FUNCTION WHEN MALFUNCTION DETECTED
| Vehicle Condition when Malfunction Detected | Fail-safe Function when Malfunction Detected |
|---|---|
| If either the SSW1 contact signal or SSW2 contact signal is stuck on, the power source mode cannot be changed by pressing the power switch. If either the SSW1 contact signal or SSW2 contact signal is stuck off, emergency stop by pressing and holding the power switch for 2 seconds or more cannot be operated. | - |
RELATED DATA LIST AND ACTIVE TEST ITEMS
| DTC No. | Data List and Active Test |
|---|---|
| B2278 | Power Source Control
|