This is a long shot, but I figure I'd try... I've been reading this and other forums with envy over the ability to upgrade Sync 1 to 3. I have a 2012 Mustang, though, with Sync 1 that has nav. I went so far as to buy a Sync 3 APIM and screen, and wired up my own harness. However, now I am stuck because I don't have HS-CAN3/I-CAN on my vehicle (not sure whether this is hidden somewhere, but couldn't find anything in the wiring manual), so I have nothing to hook pins 19+20 of the APIM to in order to get the unit to boot. I've bought an OBD emulator to allow the unit to boot (haven't received it yet), but not sure even if it boots, whether the ACM will work, as they look like they are on MS-CAN. Any thoughts would be greatly appreciated! Thank you!