Brake System Indicator

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The instrument panel cluster (IPC) illuminates the brake indicator when the following occurs:

The body control module (BCM) detects that the park brake is engaged. The IPC receives a class 2 message from the BCM requesting illumination. If the vehicle speed is greater than 5 mph with the park brake engaged, the driver information center (DIC) shall activate an audible warning.
The IPC detects a low brake fluid condition, signal circuit is low.
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.