ENTUNE RESET PROCEDURE (w/ Entune Function) DO THIS AT YOUR OWN RISK! Reset the extension module. (1) Display the "Navigation Prompt Volume" screen. (2) From the "Navigation Prompt Volume" screen, touch the corners of the screen in the following order: Upper right → Lower right → Upper right → Lower right → Upper right → Lower right. (3) Select "General" from the Entune system status display screen. (4) Select "Reset Extension Box" from the "General" screen, delete all personal data from the head unit. HINT: This will remove all personal data from the head unit.
Pardon the rudeness, but is this real? I've not heard of this menu before. Also, there isn't really a navigation prompt volume screen is there? Just an overlay when you turn the navi volume up and down right? I also have no idea what the extension box/module is.
I don't know if this works or not... haven't had a need to try it. But there is a navigation prompt volume screen. Makes her louder or quieter as you need it.
I just checked on my c Three (with Display Audio) and you're correct; there is no navigation volume screen, just the adjustment overlay. Perhaps the OP's information is for the Entune system on a different vehicle, or on the high-end nav system.
You go into the Volume settings. I have done this before (when my dealer set it they had it on full... the first time I used it, I thought my ears were going to explode when she told me to turn left). But it isn't individualized.
Where is NAVIGATION PROMPT VOLUME screen? Yes there is, SETUP -> GENERAL -> NAVIGATION PROMPT VOLUME, on that screen is how you get to the special menu. See the instruction below. From the Prompt Volume menu you hit the BLANK SPOT from what I said in the 1st post ... Because the service menu is HIDDEN, it will bring up once you follow the steps.
OK, that works = would've been handy to have this in the original post. As well as the Reset, which I didn't try, there's some interesting info there.