Remote Control Door Lock Receiver (RCDLR)
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. 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 class 2 message to the body control module (BCM) to perform the appropriate arm/disarm functions.