I believe it depends on the deck, for example there are decks that support the Audiophile system that may be capable of Splicing into for aftermarket.
What you need to do is find out if a company makes a harness that would convert that factory output to pre-outs. Even that is a stretch, so an aftermarket unit would be the more feasable way to cover the gap between now and aftermarket double DIN.
What you need to do is find out if a company makes a harness that would convert that factory output to pre-outs. Even that is a stretch, so an aftermarket unit would be the more feasable way to cover the gap between now and aftermarket double DIN.