The factory manuals from Helm, Inc are the ONLY way to go. The can be had on eBay or from Helm at
www.helminc.com. The Haynes & Chiltons manuals are crap for the Cadillacs. Yes, I agree that the ignition and remote wires may be necessary too...however, I don't know for sure. Jason (Cadillac2003STS) is the foremost authority on these systems and if he said they need to be connected, then they probably need to be.