Body Control System Description and Operation: Grounding
WARNING: This page is about a different car, the 2003 Saturn LW300, 2003 Saturn LW200, 2003 Saturn L300, and 2003 Saturn L200. However, it is still accessible from the selected car via links, so may be relevant.
Ground for the BCM is by circuit 550 through the instrument panel (I/P) ground splice pack.