DTC B2271-11: IG Circuit Short to Ground [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.
This DTC is stored when a malfunction in the IG drive circuit or IG hold circuit of the certification ECU (smart key ECU assembly) or a malfunction in the IG output circuit between the output terminal of the certification ECU (smart key ECU assembly) and IG relay is detected.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|
| B2271-11 | IG Circuit Short to Ground | When either of the following conditions is met (1-trip detection logic*1):
|
|
Power Source Control | A | DTC Output Confirmation Operation:
|
- *1: Only detected while a malfunction is present and the ignition switch is ON.
- *2: The IG circuit and IG hold circuit activate the IG relay.
- *3: After the IG circuit turns on, even if the certification ECU (smart key ECU assembly) malfunctions, the IG hold circuit will maintain the power source mode in ON.
VEHICLE CONDITION AND FAIL-SAFE FUNCTION WHEN MALFUNCTION DETECTED
| Vehicle Condition when Malfunction Detected | Fail-safe Function when Malfunction Detected |
|---|---|
| The ignition switch cannot be turned to ON (the engine cannot be started). | The power source mode cannot be changed to ON. |
RELATED DATA LIST AND ACTIVE TEST ITEMS
| DTC No. | Data List and Active Test |
|---|---|
| B2271-11 | Power Source Control
|