My GROM BT3 arrived today from Cushie Audio. I also purchased the Auxillary Cable with USB as an addon.
The McIntosh unit in my 2004 Liberty 3.0R Spec-B is a PF-25511. The removal of the Head Unit is easy once you know where to start and what to lift with a plastic spatula/scraper.
The installation was easy. Simply unplug the CD Changer in the back of the McIntosh, plug the Harness that came with the GROM, then plug the McIntosh CD Changer into the Piggyback connector on the GROM Harness (You will not lose functionality of your CD Stacker with this connector). On the other end of the harness you will find the plug that goes into the GROM unit. Once this has all been fed through into an appropriate place (I chose the bar behind the Cubby - the cubby just pulls out when pried with a platic spatula/scraper from under each vent) it is a matter of plug and play.
After you run the microphone and USB/Aux through to their appropriate places (I have chosen the 12V socket, which has been removed and the cables poked through - Also looking at getting a USB/AUX socket to fit right into the 12V socket to tidy it up), the job was done. Just tidied up cabling and reinstalled the cubby and head unit.
I have some photos I will upload when I get the chance. I may even create a Guide on how to do it
Bonus: The Steering Wheel controls worked, with Mode remaining the same (Switch through AM, FM, CD Changer 1 aka CD, CD Changer 2 aka GROM), Next and Prev the same and Volume the same.) When a call comes through it is Up to answer and Down to End.
The only thing that doesnt display is the Title tracks via Aux or Bluetooth. It remains as Track# 50 and so on and no time into song - Not a big deal.