holding the button down on the fob wont work, you could break into anyones car doing that!! you need a working remote or touch key, go through a sequence which will get the dash led to go into learning mode ie., on steady red. Now you can input your new fobs and touch keys, must program them all at once, even existing ones. How you get the correct sequence for steady red led is another matter altogether, most want you to pay for that info,.. try Google
Tam, April 2010