Hi Everyone: Want to install satellite radio in my 2000 Sl500. As far as I know this MY is not prewired for satellite radio since there is no SAT button on the radio face. I bought the XM Commander aftermarket satellite unit and want to direct wire audio through the car's audio rather than use RF modulation through the car antenna. My question is whether the 2000 sl500 have a plug in "Audio In" input either at the amp or at the radio? If at the amp, where is the amp located. If at the radio, how do I access it. Appreciate any and all help. Thanks, XGI.