Keyless Entry Transmitters
WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
The keyless entry transmitters are used to passively or actively lock and unlock the vehicle doors.
By operating either of the front exterior door handles, a nearby programmed transmitters is challenged by a keyless entry antenna. The transmitter will passively send an RF signal to the RCDLR via the door antennas; the RCDLR will then interpret this communication and either allow entry into the vehicle or deny it.