Does anyone know what the wiring for pin 15 goes to/does? The information I have shows it to be "Voltage supplied in Start"-(overload protected). I just hooked up a new Pioneer headunit with a wiring harness. However, the harness did not have wires for pin 5 (which I discovered to be the antenna booster), 18/19 which are for the steering wheel controls The harness has pin 1 (voltage supplied at all times- overload protected), pin 2 (Accesory delay relay switched output), ground and the -8- speakerwires (pins 8,9,10,11,12,21,22,23). So what function is pin 15 for? Is it only related to the factory radio? Everything seems to work fine. Any help would be appreciated as I want to make sure all items are present and accounted for. Thanks in advance for the info.