loud chimes when ignition is switched on
 

hi i have a 2002 grand voyager (3.3 limited) a problem started this week which i have no idea about and would appreciate any help.
after a 17 mile motorway drive i got home and within 5 minutes i had to go back out again,when i turned the ignition on i got a bank of 3 loud chimes 3 times which continued when the engine had fired up. there are no warning lights appearing the car still runs well but i cant work this out. i disconnected the battery for 10 minutes to see if the car reset itself(it didnt) and am at a loss. my airbag light goes on and off randomly but that was doing that back in january when i bought it. i also had it lpg converted in march and that still runs ok, i havent got time at the moment to get it checked out as im away next week. this is a uk model so i think it is branded a town and country in the us, thanks in advance for any help