I don't know if this helps but it was posted earlier here on the site.
This is out of the 2014 Touring electrical diagnostic manual. To enter the service menu:
1. Turn IGN OFF. Wait 15 seconds.
2. Press and hold power/mute button. Turn IGN? to ACC.
3. Continue to press power button for 2 seconds after the WARNING screen is displayed.
4. Release power/mute button and accept warning.
The service menu may display Diag Service not Available when a menu option is initially selected. This message will clear once the system has finished performing the power-on process. Options are: DTCs, Audio, Display, Key input, Component menus, Version info, Reset, Touchscreen.
Reset: Pre-calibration reset: Restores factory default settings. This is recommended when there are radio symptoms and no DTCs*
Post calibration save: Archives customers settings so that they can be restored after a Post calibration Reset.
Post calibration reset: Resets the radio to factory default settings and restores the last archive data stored during Post calibration.