Brake Warning

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The audio amplifier activates the brake audible warning as requested by the instrument panel cluster (IPC). The IPC sends a GMLAN message to the audio amplifier indicating the chime frequency of a fast rate and at a continuous duration. The brake warning sounds and the BRAKE indicator illuminates when the following occurs:

The ignition is ON.
The vehicle speed is greater than 8 km/h (4.9 mph). The IPC receives a GMLAN message from the engine control module (ECM) indicating the vehicle speed.
The IPC determines that the park brake is engaged and the signal circuit is low.
The brake fluid is low.
The dynamic rear proportioning (DRP) failed