My 2020 cargo came with the front speakers only (but is otherwise a high option van...sync 3, navi, etc.), after reading the BEMM I figured adding rear speakers was as simple as hooking them up.
Not quite.
Between the BEMM and the FSM I dug around and initially opted to grab the speaker wires near each tail light (both left and right are present at each respective location.
There's a separate diagram for 6 and 8 speaker trucks. I figured I had the wiring for a 6 speaker truck as there was no wiring at the mid location.
I was wrong. Apparently I have the main harness for an 8 speaker truck but without the mid location harnesses.
There's a connector for a harness to go forward from the spot between the taillight and wheel arch that serves the mid speakers and sliding door stuff, and other goodies like power running boards. If you have the 8 speaker wiring but only intend to run 6 speakers, you need to shunt the speaker wires together either here or at the taillight connector, as they're wired in series and won't work without both pairs of speakers.
Trouble was I'd already buried those connectors behind cabinets and toolboxes and the prospect of unbolting everything to dig them out was unappealing.
So I grabbed both pairs of rear speaker wires directly from the harness right before it exits the raceway and slides down the rear left side of the van body.
Got all that hooked up. .. no audio, and no fader on the head unit. . . not as easy was just hooking them up, it seems.
Next problem was turning that on in the ACM.
Quick live data view of the ACM with a generic scan tool showed it was set to "rear speakers: disable".
View attachment 153994
Fired up FDRS, bought another 2 day pass ($50, but I had another keypad I needed to program anyway) and thought this was gonna be a cakewalk when I found the "enable the rear speakers" function right under the ACM.
View attachment 153995
Downloaded and ran it. . . failed. Not possible with this VIN.
Ran it again. . . failed.
Tried the "configuration" and "programmable module installation" functions. . .no change.
Apparently Ford sent my van out with upfitter package and 8 speaker wiring and but blocked the option off in the ACM to ever enable them.
Ok, no big deal. . .there's always Forscan (which I've never used).
Downloaded it, ran it, it happily recognized all the modules on the truck, even the ACM. . . but had the scary hex editor screen instead of the friendly options toggle screen for the ACM.
Bit of googling, another user on here had the same issue.
I have a new 2020 AWD EXT High Roof Cargo with the Ambo Package... the rear speakers aren't on... can't seem to figure out or find any information on why. Anyone know. Gotta be something simple.
www.fordtransitusaforum.com
Followed FordTC2021's instructions, changed one single block of code to 0001, puckered up and sent it.
View attachment 153997
Cycled the ignition and was elated to finally have THIS screen and functional rear speakers!
View attachment 153996