Keyless Entry Transmitters
WARNING: This page is about a different car, the 2012 Buick Verano. However, it is still accessible from the selected car via links, so may be relevant.
By operating any of the exterior door handles, a nearby transmitter is challenged by a keyless entry antenna. The transmitter will send an RF response to the remote control door lock receive, which communicates with the BCM. The BCM will interpret this communication and either allow entry into the vehicle or deny it.