Brake Warning System Description and Operation

Brake Warning System Description and Operation

Brake System Indicator

The instrument panel cluster (IPC) illuminates the brake indicator when any of the following occur:

* The body control module (BCM) detects that the park brake is engaged. The IPC receives a serial data message from the BCM requesting illumination. If the vehicle is shifted out of park with the park brake engaged, the BCM sends a serial data message to the radio in order to activate the audible warning.
* The BCM detects a low brake fluid condition. The IPC receives a serial data message from the BCM requesting illumination.
* The electronic brake control module (EBCM) detects a brake failure condition. The IPC receives a serial data message from the EBCM requesting illumination.
* The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
* The IPC detects a loss of serial data communications with either the BCM or the EBCM.