Circuit/System Description
WARNING: This page is about a different car, the 2006 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
When a keyless entry transmitter button is pressed, an RF signal is sent to the vehicle. The remote control door lock receiver (RCDLR) receives this RF signal by way of the keyless entry/tire pressure antenna. When the RF signal is received, the RCDLR determines the specific command sent by the transmitter and will relay this message to the body control module (BCM) via serial data. The BCM will then perform the command.