So i just bought a 2009 Tahoe LT and noticed it had a camera just above the license plate. It does not have the nav system in the dash but rather the plain jane stock radio nor does it have bose. How would i find out if this did have it but before someone traded it in they swapped head units out? I can get an OEM screen from a buddy that runs a salvage yard but want to make sure it would work first. Any suggestions?