Yes, I had the old style non folding mirrors. All I did was install the 3 button mirror switch and installed the mirrors. The power folding worked, the turn signal worked, the heat worked. I had to re wire it in order to have the Amber clearance lights work (I chose the turn signal option which was easier). I had to run a wire to the back up lights from under the dash (I believe the wire I used was from a brown 26 pin plug, solid blue wire in pin #26). At the same time, since I was pulling wires, I pulled an extra wire just in case I decide in the future to change how I have the Amber lights running.
The auto fold option, when pushing the key fob, needs to be programmed at the dealer and I just have to figure out when I have time to take my truck there. The power fold works only when physical pushing the new 3 button switch. The reverse tilt will do the same after programmed. There is no "need" to re-flash at the dealer. But if you want the auto fold and reverse tilt to work, a re flash is required.
Has anyone had the ECM re-flash done for the auto-fold and reverse tilt to work? I met and was talking to a GMC recall rep last weekend and he said GM has strict instructions to their dealers not to re-flash ANY ECM's for additional features for a while. GM wants to keep all their vehicles with their born-with features for a while because of their saftey lawsuits.That is great news ... thanks for the reply.
If or when you get the re-flash for the auto-fold/reverse tilt, please post whether successful or not.