I have just bought a second hand Autotrail Apache 700, made in 2002. It has a "Sigma" alarm system, when I first bought the MH 3 weeks ago, the fob, to, automatically open, close doors and arm alarm worked ok. Yesterday, I noticed a tiny (2inch x 2inch) key pad stuck to the inside windscreen, in front of the driver, not knowing what it was (the previous owner had not said) I touched it with my finger, and a red light flashed. Oh dear since then the automatic key fob will not work ! Any ideas anyone ?