I have a 91TT. It had the bose system a long time ago. It was replaced with a Pioneer DEH-2300 reciever along with 3 ways all around and a sub.
My question is, can I just pull out the old DEH-2300 and put in a new Reciever from pioneer? Since the old pioneer reciever needed a wiring harness, will that wiring harness I currently have in there plug right in to the new Reciever?