[My Wife\'s Hummer]

i am trying to install the avic-d1. i am using pac audio os2 wiring harness. i have checked and rechecked my wiring. i plugged it all in last night, and nothing.

i know that i have to cross the three purple wires for the onstar to work. i haven't done that yet. will that keep the aftermarket unit from powering up?

i am wondering if my interface module is not working. anyone know?

thanks