Well, is it time for a service call? My wife and I have noticed a few times where our new '02 Odyssey sounds a warning beep when we are backing up (I don't think it has happened when we are going forward). It only sounds one time (I think). It is the same sound as when we put the car into gear with a sliding door open. Doesn't happen consistently, but occassionally. Anyone else had a similar problem? Any suggested solutions short of going to service? Thanks.