Power On The Unit And Hold The M Button. This Will Display The Serial Number Across The Screen. Once You Have Noted The Serial Number Call Your Local Dealership And Ask For The Security Code. They Will Ask For The Serial Number You Noted And Then Give You The Code For Your Exact Unit. The Code Isn't The Same For All Of The Units As It Is For Security Purposes.
Hope This Helps You,
Sincerely,
Michael Scott