Did a search, found the article:

6. Immediately Press and hold the rectangular "Select" button found on the right
column of buttons. Hold for at least 15 seconds.

7. Briefly release the "Select" button and then press it again until the submenu
Titled “SERVICE” comes up. Navigate this sub-menu by pressing the button under
the "Select" button that has the < arrow and the > arrow on it.

Holding for 15+ seconds, then releasing and pressing "Select" does not seem to work for me. Even when Nav volume set to lowest level, she is loud...dealer just shrugs...also, yesterday, she went silent and I missed a turn...any help, TIA.

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