07blacksilveradohd

i have onstar in my truck so i cant use the mute wire bypass. i have tried using the relay and the amp turm on wire way but after i reach 16mph it says error with parking brake and wont let me view my movie/dvd. What else is there to do? i was going to try the software bypass but when i change the 16 to 128 it wont let me save it. Is there another solution/bypass to try? could i get another mute wire with the pin and do it that way and still keep my other mute wire in tact?