Remote Control Door Lock Receiver (RCDLR)
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The keyless entry system can arm and disarm the CTD system. When the remote control door lock receiver (RCDLR) receives a door lock or unlock signal from the transmitter, the RCDLR sends a message via serial data to the body control module (BCM) to perform the appropriate arm/disarm functions.