Here is the Sync3 mapping:
7D0-01-01 *xxx xxxx xx--
Smart DSP (DSP), AAM, Sirius Satellite Radio (SDARS), Rear Seat Entertainment (RSEM)
Sync4 looks pretty much the same based on the latest mapped spreadsheet I have:
7D0-01-01 *xxx xxxx xx--
Smart DSP (SDSP) • AAM (AAM) • SDARS (SDARS) • RSEM (RSEM)
The "2 less" approach should still hold true for this feature:
2 - 0
3 - 1
6 - 4
7 - 5
A - 8
B - 9
E - C
F - D
@High Country I would go through 3 or 4 key on - key off cycles to verify if it worked or not. Sometimes it doesn't update with the first cycle.
Can't guarantee the Sync4 spreadsheet is 100% accurate, either, as Sync4 is a new animal... When I searched on Forscan.org and Ford-Trucks.com I didn't find anyone who had mentioned success or failure with this on a Sync4 vehicle (21 F150, 22 SD)