Brake Warning Light Remains ON [04/2018 - 08/2020]: Description

WARNING: This page is about a different car, the 2022 Toyota Avalon, 2021 Toyota Avalon, 2020 Toyota Avalon, and 2019 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.

If any of the following is detected, the brake system warning light (red indicator) remains on:

The skid control ECU (brake actuator assembly) connector is disconnected from the skid control ECU (brake actuator assembly).
The brake fluid level is insufficient.
The vacuum inside the brake booster decreases.
EBD operation is not possible.