Im having the same problem but my mute wire is connected properly. Should I be grounding the mute and the parking break to the chase or conecting it to the ground provided in the car? I have from the deck ground,mute and brake wire connected then grounded to the ground provided in the car. Im wondering if it is overloading the ground. I moved the yellow and black wire up one pin. I keep getting a warning on start up brake lead connection problem.