hey ,im new here in this fourm ive been lookin for a solution for my hu, ive got 08 vec with 2 buttons on display screen i think its a tid with a cd30 hu,i was willing to upgrade my hu to cd 70 navi,ive got the bc button but when i press it it says no function,im full canbus but the roller on the left side of the wheel doesnt have any function only the one on the right,i was willing to have my bc to work by changing the head unit and the display would it work automatically,or there must be any add ons,