I know that the answer is probably already posted somewhere, but I just wanted to confirm.....On the AVIC N3 , to complete the bypass, you must only flip the switch on the bottom of the unit, or do you also have to ground a wire somewhere and flip the switch. I am kinda slow when comes to all this technical stuff, so please respond keeping that in mind. Also, if there is a wire that needs to be grounded, which wire is it, and where should it be grounded??? Thank you in advance for your help.