I am not sure which IPC you have in your vehicle, but for the radio functions, have you looked at the IPC settings for Entertainment Non-Sync Source - ENSS AM/FM (ENSSAMFM), ENSS CD (ENSSCD), ENSS DAB (ENSSDAB), ENSS Sirius (ENSSS). Look in FORScan for the IPC part number and post it here, I might have the proper asbuilt database for it.
For the Nav function, you say this does not work on the APIM? If not, it certainly will not function on the IPC. Is the IPC always saying North and does not change? You can check the satellite receivers and signal strength in the test menu of the APIM. Did this happen when you switched to the 2019 APIM?
Check this setting:
7D0-03-01 x*xx xxxx xx–
GPS Mount Type (GPSMT)
This should likely be ‘0’ if you have a roof mount antenna.
Did you change out the antenna for Sirius/GPS on the roof?
Link to previous thread: 2019 APIM/ACM in 18 Fusion - Ford / AsBuilt Configuration - CyanLabs Official Community