If your car did not come with OBC or cruise control and are thinking of adding one or the other....usually OBC is done first. Have your shop enable both, I cant see where it could cause a problem...it would simply not be there and would not be plugged up. Then in the future if you decide to add this feature it will save you a trip to the shop and possibly a service charge to have this activated....you simply add a harness and you are set to go.