All the dash lights go crazy sometimes. It looks like a marqee at times with letters, numbers and crazy patterns scrolling across. Get alarms when nothing is wrong. Had it to the dealer many times, but they always said it didn't store any codes. All those flashing, scrolling lights create quite a distraction at night.
Electrical on 2000 Buick LeSabre
Did you find out what was causing this problem?
I just remembered this site, it shows similar problems with the instrument [panel. You may want to call them and see if they have seen the problems you are experiencing. http://www.modulemaster.com/en/services/instrument_clusters.php
No, we never did find out what was causing the problem. We've just learned to live with it and ignore it.