Occupant Restraint Audible Chime
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The BCM will provide an audible chime based on the class 2 message received from the SDM if the drivers seat belt is not buckled when the ignition is turned to run or crank. The chime rate for this feature is 50 chimes per minute.