Park Brake Chime
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
The body control module (BCM) activates the park brake chime when the park brake is engaged and the signal circuit is low and vehicle is driven for at least 3 seconds at a speed above 4.8 km/h (3 mph). The chime will sound at the rate of 150 pulses per minute, fast rate chime. The park brake indicator will flash for any distance the vehicle is driven every half second until the park brake is no longer engaged.