It's been a looooong time since that happened to me, but it happened shortly after I rebuilt (well, cleaned up) the seat control int he door. Might make sure the connector is seated / in good shape?

Have you had the door panel off recently?

__________________
~shell
As of 2/2010:
2001 CLK55 0o\=*=/o0
13.6 @ 106mph
10K mi
1984 300SD
260K mi and going and going...
97 S600
46K miles
1991 Sentra SE-R (extremely dorked with)
www.se-r.net