2009 sl550 tips, tricks and aftermarket upgrades.
 

I recently purchased a 2009 sl550 (r230 facelift). I also have a 1995 sl320 which was easy to find upgrades and aftermarket parts for. The new one is nor so easy. Do any owners out there have any info on links or good tricks to do to my new sl? I am adding a backup camera in two weeks but I've tried to access the command engineering menus and have had no luck. I pressed hang up, 1 and hthe pound sign but nothing happens. Any advise?