My Dad's 360 coupe (2002) had been sitting unplugged for about a week or so, and I noticed a high-pitched chirping noise from the car. The beeping was a different sound than the beep given by the keyless entry. I was told this meant the battery was going dead, so the car was driven and subsequently plugged in. There is now a continuous CHIRPING sound coming from the car. However, the sound is definitely the beep made by the keyless entry/theft deterrent system. Chirp chirp chirp! It's chirping all day and all night. The chirps are random and about once a minute on average. What the heck is going on here?