mine will go off any time I lock the doors, but it was messed up at a body shop. I have heard from other Legend owners that the OEM alarm is known to go off at odd times. I have heard of one car that has gone off only twice in its whole life, and both times, 4 years apart, nothing caused it to go off. My solution is to get a good aftermarket alarm and scrap the OEM.
Later!
Lee
Later!
Lee