Alarm system has stopped working on my x reg 4.0 cherokee jeep.Both key fobs have new batterys, was ok, up and till brakes where replaced recently.Jeeps battery showing charged.Alarm still wont work having to manualy lock doors. Local garage has no idea why it has failed to work what has gone wrong.

Please explain what year a X registration vehicle is ,as i have no idea ,last one i remember was a T 1978 .Now i think that this alarm fob might need re-programming into the vehicle where you swing on the aerial whilst holding the key fob in teeth and pressing the brake and the FM button on the radio at the same time ,When my all data books arrive next week i might be able to help but yes i have had this problem before and yes we do have these vehicles here in spain but mainly diesels ,now last time it happened when a customer changed the batterys i held the button down on the fob then turned the ignition on and it all sort of bleeped and started working ,but perhaps an american person with more experiance than myself might know how to do it correctly ,Now if you ask me about a humber hawk or a morris minor??