I have a 2003 bonneville ssei. Tonught the G.F. Came home and when she got out of the car, with keys in hand. The dinger started sounding like she was leaving somthing on. She closed the door and hit the lock on the fob and head lights stayed on. she would open the door and dinger would contuinue. So she decided to disconnect the battery cable while she was doing this , the lights went off got back in everything was normal started it up and it started doing it again. It takes about 15 min for them to go off. We have got some wet wheather that she was driving in.
I did a search to see if i could come up with anything but no luck.