Hi everyone. I"m the new owner of a'17 Volt (previously '13) and want to install an auto dimming mirror on my new LT. I pulled the overhead onstar console down hoping to find the 3 wire harness loose in the headliner but nothing there. I'm wondering if anyone knows if that harness is somewhere up there I missed or if there is an adapter that will take the plug going into my overhead console and provide a plug for a OEM auto dimming compass (like the one that comes with the premier). Does anyone with a premier have a pic of their wiring under there? I wasn't able to find a pic. I thought maybe that would tell me if GM uses an adapter or a separate wiring run for it. I'm really not wanting to have to run all the wire myself, I have looked at some of the homelink install threads and that's more than I want to tackle.