[culrich]

I consulted with the guys over at BestBuy (great guys, BTW) who didn't have time to do it (I'd pay the $50) but did print out the info they had for me. A couple of issues:

1 - they indicate to wire it to the left front speaker rather than splice to an input/output from the onstar phone. Thoughts?

2 - They said do NOT hook into the mute line coming from OnStar. You need to set a relay, etc., and it can trip the anti-theft, locking up the head unit. Instead, just turn the volume down the old fashioned way - with the knob.

3 - Instead of wiring to the ignition, wire to the positive on the cig lighter that only runs in accessory mode.

Any thoughts on this or on other wiring advice / diagrams, etc.?

Thanks