holstbnet said:Punisher - check http://www.car-part.com or http://www.copartfinder.com -- they won't list OnStar module in their parts list, but you can find an 05 OnStar equipped vehicle (which doesn't have to be an Avalanche, of course) and call the yard that has the vehicle. A lot of em don't know what it is or what it's worth.. which means that either: 1) They will assume it's worth it's weight in gold and want a lot of money or 2) They will shrug and say "a black box is a black box" and let it go for $25 plus shipping. I've had BOTH scenarios happen to me.
Good job !!!