I also found one out of 2004 XLR, part#15282636. They look similar, but can't seem to find out which units are compatible with the Deville. The part number for the unit on the SLR is #15295140. Any help is appreciated.
the one of the XLR will not work nore will the SRX the worst thing that could happen you plug it in and it bloows out your ECM ECU computer what ever you want to call it
just as if you where to plug in a navi unit without a harness in a car that didnt have it at first
they just wont work
i was looking into this a few months back i found a SRX navi unit NIB New in Box for 200 on ebay i wanted it but didnt because it would be throwing away money the brains are totaly not the same