im not TOO familiar with the factory pin out, cuz usually i just replace the radio anyways, so i have the aftermarket unit wires to work with. one of two things could have happened. that wire is really a databus wire or something similar and caused damage, or the radio simply needs to be reset, which it seems you did already. did the switched power lead turn off when the car was off at all?? you said when the radio was off, i just wanna clarify. send me a link to the write up you were using, and take a pic of your harness and post it as well.