I tried to remove pins 4 and 15 but could not get them out. I ended up cutting the wires, pin 4 is a red and white wire, this wire carries the speed of the car and locks you out from entering addresses etc into the GPS while you are moving. Pin 15 is a red and black wire, after this wire is cut, the side going to the GPS screen must be grounded, this wire carries the emergency brake on or off signal.