Brake Warning Light Circuit: Description
WARNING: This page is about a different car, the 2007 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
The BRAKE warning light comes on when the brake fluid is insufficient or the parking brake is applied. The skid control ECU is connected to the combination meter via the CAN and multiplex communications. When the DTC is normal and BRAKE warning light remains on, perform troubleshooting as indicated below.