I own a 2011 Caddy DTS and received an interesting notice in the mail yesterday. Bottom line of the notice was that there is a problem with the certain GM platforms like the Buick Lucerne and its sister car the DTS/Deville with the fuse panel that resides under the rear bench seat. Specifically the fuel pump relay that sits under the corner edge of the fusebox cover.
Apparently when the rear seat gets loaded with weight (i.e. passengers) the frame of the seat presses against the fusebox cover and causes the fuel pump relay to move and shift in its socket. Over time the socket wears out and causes excessive electrical fuel pump draw, melted relay connections, or in some cases a small fire that melts the fusebox.
GM has a series of service bulletins out there -- SB-10074301-0699
The letter I received isn't a direct recall, but only a notification that this is a potential hazard and to keep an eye on it. Yeah right! GM
I found a good YouTube vid on the subject on the South Main Auto channel --
The apparent immediate solution for this problem is to use a "Low Profile" relay that doesn't contact the lid of the fusebox when the seat starts pushing down on it. I'm not certain that this relay is any different from the relay that already in it -- will have to take the seat out and check.
Low Profile Relay GM Part Number 88953222