I've looked at the tips from this forum, but my things doesn't work. I grounded the parking brake line and the mute line. what else could be wrong? also, when my system starts up, it tells me that the parking lead is not connected properly. is it because it's not grounded properly?

sounds to me like a bad ground... also did you move the mute wire to the new location to be grounded? it goes above in the harness..

re-ground your wire's and you will be fine. i got mine working np at all..