when i open the door and the headlights are on the allarm to warn me ?

Hi
Hard to answer without a make ect.....However the sounder unit is normally positioned on a relay/fuse board for example on the older mondeos its on the board under the glove box. Best bet is to locate yours, go to a scrap yard once you now where your looking for it and get afew, if the old one does'nt work after being taken out cleaned and put back.

paul
July 2008

What make and model of car??

Brian.J.
July 2008