As long as the keyfob batteries are good.

Go under dash drivers side and there's a GEM module with a row of coloured plugs, flip the yellow locking levers over , disconnect the plugs and reconnect them.

Then key in ignition from 0 to II 4 times QUICKLY (under 5 secs), should be a chime from the car, then press a button on remote, same chime again which tells you the fob is learnt. If you have more than one fob you need to program it at same time or it won't work either.