Hit MENU button on the right side of screen you should come to a window.

Click on Volume. Once in the Volume MENU, click on top left where the picture of the speaker is

Then Click on bottom left (I know there's nothing there but click on it)

Then Click on top left again, the picture of the speaker

Then Click on the bottom left again
It should bring you the SERVICE MENU

If not try again it is there !!!!Takes the touch LOL

Oh if you mess up your unit don`t come to me.Change at your own risk!!
No a lot of damage you can do but it can switch things up a good bit to hinder your use

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Truck:1997 Ford F-150 STD. Cab 408ci.Twin turbo
Audio:Eclipse,Digital Designs,Phoenix Gold,American Bass

NEGATIVE.