I have an 07 Saturn Ion 2 that I installed an X920BT in. I bought the GMOS LAN 06 wiring harness to retain onstar functionality. I installed the head unit in my car, attaching the parking break wire (light green) to the ground, and not bothering to attach the speed sense wire at all. I also didn't bother to attach the harness with all the RCA connections to the head unit, as I wasn't going to use any of them.
Everything seemed fine for a few days, but then yesterday morning for no reason at all the car alarm started going off. I turned the car alarm off with the key fob, and drove to