Brake Warning System Description and Operation

Brake Warning System Description and Operation

Brake Warning Indicator and BRAKE FLUID Message

The instrument panel cluster (IPC) illuminates the brake warning indicator when one or more of the following occurs.

* The body control module (BCM) detects that the park brake is engaged. The IPC receives a low speed GMLAN message from the BCM requesting illumination.
* The BCM detects a low brake fluid condition for 30 seconds. The IPC receives a low speed GMLAN message from the BCM requesting illumination. The driver information center (DIC) will also display the BRAKE FLUID message.
* The electronic brake control module (EBCM) detects an ABS malfunction which disables dynamic rear proportioning (DRP). The IPC receives a GMLAN message from the EBCM requesting illumination.
* The IPC performs the bulb check at the start of each ignition cycle. The brake warning indicator illuminates for approximately 3 seconds before turning OFF.
* The IPC detects a loss of GMLAN communications with the EBCM.
* The Display Test is performed with a scan tool.