To Peejay,
I could almost kiss you ! All day I've just been having huge headache with faulty alarm/immobiliser on the 2001 Megane Coupe I bought yesterday. Tried everything. Nothing would work. Googled the problem - and hey presto .... found your posted advise - worked first time !
Thanks you very much for sharing this advise, you have saved me untold hassle and no doubt expense.
Chris
Chris (Peacehaven), February 2010