Remote Control Door Lock Receiver (RCDLR)
WARNING: This page is about a different car, the 2007 Cadillac XLR. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
The remote control door lock receiver (RCDLR) is not on the GM LAN high speed bus, therefore the RCDLR and the engine control module (ECM) must use the body control module (BCM) as a gateway in order to communicate.
The RCDLR is a multi-function module located in the center of the dash panel. The keyless entry antennas are controlled by the RCDLR to allow passive vehicle entry, as well as vehicle starting and vehicle theft deterrent operations. The RCDLR will send an AC voltage signal and provide ground to the keyless entry antenna when an exterior door handle switch, exterior rear compartment lid release or the Start/Acc/Off switch is depressed. This will enable the keyless entry antenna to send out a low frequency broadcast challenge to a key fob in range. The RCDLR also has an internal radio frequency (RF) antenna to receive the key fobs passively or actively sent signal.