Last week I happened to use the remote fob when the boot was open on my Aero closing the doors.I immediately used it again to unlock the doors and this caused a hihg pitch sound to come from the dashboard.I disconneced the battery which did not stop it.I assume it may have been a relay sticking on the alarm system.Turners Hill Saab had no idea as to the problem.I drove the car home about 35 miles & happened to go over a break in the road surface which jolted the car and the noise stopped and no problems since.Has anybody else experienced this problem or have an idea as to the cause.