Answer:
Hello. Bypassing a parking brake on a newer Clarion radio requires an interface. You can not just ground the parking brake wire or put in a code... people that tell you this are wrong. The least expensive, smallest, and best quality i have found are on http://microbypass.com. I am an installer and i use these all the time. The company also sells them on Ebay too. The sellers name on Ebay is radonich1 this is his page
http://shop.ebay.com/radonich1/m.html?_trksid=p4340.l2562