How do you program a keyless entry remote for a 05 Cadillac Srx?

To program a keyless entry remote for a 2005 Cadillac SRX, first, sit in the driver's seat with all doors closed. Insert the key into the ignition and turn it to the "On" position without starting the engine. Press and hold the "Lock" and "Unlock" buttons on the remote simultaneously for about 15 seconds, then release. Finally, press the "Lock" button once more to complete the programming process; the locks should cycle to confirm successful programming.