Have to read your ownwers manual? Because how to fix your problem is there. You might even learn some more cool things about your vehicle.
I answered this desprate post with valuable info and you report me?
And i quote "Ignorant and immature reply to a discussion. This is all about helping each other out. Not putting others down!" (Is that educated and mature?)
The only ignorance here is yours of your own truck.
Took me 2 minutes 30 seconds to look up your truck on the internet and find out that the second post of this thread ( A day before your plea for help) Is totaly correct.
Just incase you need to see it in your owners manual here is where it is,
Route Guidance - Adjusting the Guidance Prompt Volume
ADJUSTING THE GUIDANCE PROMPT VOLUME
Turn the volume control when a guidance prompt plays to adjust the volume.
Read your ownwers manual or be ignorant of your truck.