Hey so my 99 grandmarquis LS beeps sometimes and its annoying, it stops when i slow down sometimes and then starts again but mostly its random and usualy happens after i've been driving a bunch.Doesnt always happen, there is also no lights that show up. does anyone know what this is? attached is a video of me filming the sound while driving (youtube link)

http://www.youtube.com/watch?v=i9FsrPrGqXI

 

Looks like you have the same issue has the below person:

https://www.mercuryforum.com/forum/s...ead.php?t=5060