The MBZ pre-wired harness should be located around the fenderwell, usually tied down w/ cloth tape or wire tie. To interface an Alpine M-Bus CD-Changer w/ the MBZ, you will need a logic controller adapter. Best one around is made by Blitzsafe (www.blitzsafe.com
), available via your local car audio shop. After plugging in the adapter cable, route it under side compartment and mount the CDC in vertical position, flushed to body frame. Don't forget to reset the Alpine suspension springs to vertical mount before installation. Good luck and happy holidays.