How do you reprogram remote for Cadillac DTS 2007?

To reprogram the remote for a 2007 Cadillac DTS, first, get inside the vehicle and close all doors. Insert the key into the ignition and turn it to the "On" position (without starting the engine) and then back to "Off" five times within 10 seconds. After the fifth turn, leave the key in the "On" position, and the locks should cycle, indicating the vehicle is in programming mode. Press any button on the remote you want to program, and the locks will cycle again to confirm the programming. Repeat for any additional remotes, then turn the key to "Off" to exit programming mode.