- turn the ignition to accessories
- press the boot release button (on the dash, not the remote) 3 times quickly. This will put it in learning mode
- press a button on the new remote to download the codes to it. The door locks will opperate 2 times to confirm the codes have been downloaded.
- To finish, turn ignition off and check the new keypads.
It took me a few times to actually get it to work, so if it doesn't work first time, just do it again.