Hi to all, ok anyone got any ideas with this one, i have a 54 plate punto active 1.3tdi multijet (if that helps) on the back of my blue key i have a rectangle button and when you press it a red light comes on (on the key not in the car) this is meant to open all the doors (remote central locking) but it dont work, i rang fiat an they said to change the battery but it cant be that as the red light comes on which surely would mean the battery is ok, so i was thinkin it could be that it needs reprogramming but i dont think i can waste a whole weeks wages on getting fiat to do it for me so does anyone know of anyway you can do it yourself or a website that may be able to tell you how to do it?
thanks to anyone who has any ideas on this x

put key in ignition press lock unlock twice get out car and press lock shud wrk, make sure ignition is on when u doin the lock nunlock