DTC P1BFB-9E: Battery Discharge Control Circuit Stuck On [10/2022 - ]: Description
WARNING: This page is about a different car, the 2025 Lexus RX 350h, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.
The motor generator ECU located in the hybrid motor control inverter assembly receives power from the IGCT power source line and discharge control power source line. A semiconductor switch is installed in the motor generator ECU to switch which is used to switch the discharge control power source line power source on and off.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|---|
| P1BFB-9E | Battery Discharge Control Circuit Stuck On | When the motor generator ECU is started, the discharge control BAT switch command flag is OFF for a certain period of time, but the discharge control BAT voltage is at or above the threshold at that time. (1 trip detection logic) |
Hybrid motor control inverter assembly | Does not Come on | Master Warning: Comes on |
Motor Generator | A | SAE Code: P1BFB |