Just some FYI: some 2000 and later delco radio must have special adaptors in order to swap out head units. The D.I.C. ( driver information center) controls run thru the radios. Also 23 models will have xm radio available. Sincerly, orl222 a.ka. western region product trainer, Pontiac-Buick Gmc.
What I meant was that on some of the newer GM vehicles, some of the elctronics the driver information system pass thru the stock delco radio. special adaptors are required in order to keep your vehicle functioning properly. If you swap out the head, you will lose fuctionality of even door locking options, or the long life oil monitoring system.