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Oilman,
Not sure exactly; however, usually the in-dash units are 'sat ready' which means you have to find and plug in a sat module (not an aftermarket Sat radio) for your particular system. The ones I've done in the past (for an FJC, not Avy), involved pulling the head unit, installing the module, connecting the antenna, then re-installing the head unit. That allowed the 'Sat' button on the unit to function.
Aftermarket Sat add-on radios usually install quite differently....some using a direct connect to the Aux on the unit (many head units have one to the rear of the unit to allow for cleaner install), others sending an FM signal.
HTH.
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