Rear Compartment Antenna
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
The rear compartment antenna is used to transmit low frequency communication to the keyless entry transmitters for entry to rear compartment.
The rear compartment antenna is located under the rear fascia and is accessed from under the vehicle. The antenna is controlled by the RCDLR. When the rear compartment touch pad is pressed, the antenna sends out a challenge to the keyless entry transmitter which begins the passive entry communications.