Park Brake Warning

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The instrument panel cluster (IPC) activates the park brake audible warning as requested by the body control module (BCM). The BCM sends a GMLAN message to the IPC indicating the chime frequency (fast rate) and duration (continuous). The park brake warning sounds and the brake indicator illuminates when the following occurs:

The ignition is ON.
The vehicle speed is greater than 5 km/h (3.1 mph). The BCM receives a GMLAN message from the powertrain control module (PCM) indicating the vehicle speed.
The BCM determines that the park brake is engaged (signal circuit is low).