For the 2003 through 2006 model years, Cadillac Escalade SUVs had factory keyless entry systems that used 3-button remotes with lock, unlock and panic buttons. The original keyfobs have FCC ID LHJ011 and any of a slew of GM part numbers. This is Remotes Unlimited part 583-1583. See this part at this link.
Cadillac Escalade keyless entry systems during this period are user programmable.