Is this something related to why my USB ports don’t work anymore?
Like I said my USBS worked absolutely fine on your 3.4 sync3 before this reverse camera was installed
I’ve pulled the USB hub out from under the arm rest and all wires connected. Do these lead into the back sync 3 unit somewhere which they might of not connected back in?
on a Focus it takes like 5 minutes to get to the APIM, trust me i know, i did it like 30 times in my old Focus ST just double check all the wires and you can also try using a mini usb adapter and plugging a USB directly in (not that you likely have one, but you can get them on amazon pretty easily) https://www.amazon.co.uk/TECHGEAR-Mini-Adapter-Cable-Host/dp/B00DM6EMQ2
There are 2 cable connections on the USB hub. A usb connection and a power connection. Based on your model year, you’re looking for a plug with 2 rows of 4 pins that will fit onto the USB hub on the rear. The connector is possibly white.