DTC B279A-12: Engine Immobilizer System Circuit Short to Battery [10/2022 - ]: Description
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
If the communication line (IMI - EFIO) between the ECM and ID code box (immobilizer code ECU) is stuck high, the ECM will store this DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|
| B279A-12 | Engine Immobilizer System Circuit Short to Battery | The communication line (IMI - EFIO) between the ECM and ID code box (immobilizer code ECU) is stuck high. (1 trip detection logic*) |
|
Engine | A | DTC output confirmation operation:
|
- *: Only output while a malfunction is present.
VEHICLE CONDITION AND FAIL-SAFE OPERATION WHEN MALFUNCTION DETECTED
| Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
|---|---|
| Engine cannot be started | Engine cannot be started |
RELATED DATA LIST AND ACTIVE TEST
| DTC No. | Data List and Active Test |
|---|---|
| B279A-12 | - |