Console Passive 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 keyless entry console passive antenna is used for both keyless entry and vehicle starting functions. In their keyless entry function, they are used to locate any keyless entry transmitters within the vehicle. In the antenna's vehicle starting function, the antenna transmits and receives the needed communications with the keyless entry transmitter to enable vehicle starting.