Yeah, so on our FXTs..
Key in Accessory position
Radio Off
Press 3-4 together, press and hold TUNE for Sedan mode
-or-
Press 3-5 together, press and hold TUNE for Wagon mode
-or-
Press 3-6 together, press and hold TUNE for Through mode
If press and hold TUNE doesn't work, tap it once, then press and hold.