Brake Control Warning Light Remains ON: Description
WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
If the ECU stores a DTC, the brake control (ECB/VSC) warning light comes on in the combination meter. The skid control ECU is connected to the combination meter via CAN and multiplex communications.