DTC B279A-12: Engine Immobilizer System Circuit Short to Battery [09/2023 - ]: Description
WARNING: This page is about a different car, the 2024 Lexus TX 550h+ and 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
If the communication line (IMI - EFIO) between the hybrid vehicle control ECU assembly and ID code box (immobilizer code ECU) is stuck high, the hybrid vehicle control ECU assembly 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 hybrid vehicle control ECU assembly and ID code box (immobilizer code ECU) is stuck high. (1 trip detection logic*) |
|
Hybrid Control | 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 |
|---|---|
| Hybrid control system cannot be started | Hybrid control system cannot be started |
RELATED DATA LIST AND ACTIVE TEST
| DTC No. | Data List and Active Test |
|---|---|
| B279A-12 | - |