hello! i have a 2016 apim that i was using on 3.4. i wanted to downgrade to 3.3 to play with for a while as i never rlly experianced it before. i got it downgraded but i am having a few issues. if i start the car it will say navigation fault. the only way around this is to turn the radio on before i start the car it works. my other issue is when i disconnect carplay the system will say audio off and will not let me turn audio on unless i force restart the apim. are there any fixes for these issues? or do i just need to go back to 3.4 and call it a day. i would really like to get this working if its possible.
SYNC Region: NA
Navigation Variant: Nav
Manufacturer Year: Pre MY20
Install Type: Retrofit
Old SYNC Version: 3.4
New SYNC Version: 3.3
Do you have a error message, if so what is it?
navigation fault, audio off
That would be because your maps are for 3.4.x you need to go back to 3.4.x
2016 Fusion was a transition year, its a one off in some cases with wiring harnesses and module firmware.
On the 2016 Fusion a few people had cluster compass direction issues going to Sync3, the fix for that was to get a USED (not a new one) 2017 Fusion GWM (OBD2 port module).
Upudate the firmware on the APIM to MY18.5+ and it will likely fix your issues You will need a Sync 3.3 or later Strategy file. Keep in mind that using older OS files with newer NAV files will have some inconsistencies.