The factory amplifier remote on must be connected to power when the radio is on as this same wire also powers the factory antenna.Originally Posted by speeddemon
Usually the new radio has a remote on lead (blue) that shoudl connect to this. In my car the wire in the dash behind the radio that does this is white with a pink or red line... yours might be different as it is newer. Consult a wiring diagram for your model to know.
If your factory amp is coming on this should be operational. I think the antenna can be accessed if you remove the rear coiurtesy lightsnick