Body Control Module (BCM)
WARNING: This page is about a different car, the 2011 GMC Canyon and 2011 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
The BCM is a multifunction module that operates both the keyless entry system. When an RF message is received from a keyless entry transmitter, the BCM interprets this signal performs the specific function, i.e. door lock, door unlock, or vehicle locate.