I have searched all over this site for a definite answer to bypassing the D1 but cant find anything but D3 and half answers for the D2. I know I have to ground the parking brake wire which I did. As for the mute wire, I'm not sure what to do with if anything. With just the parking brake grounded, it seems to work so far but I get a caution message every time I turn it on saying that the parking lead is not properly connected. Any help would be great. Thanx