Press the Menu button on the right side of the radio right above the NAV button
There will be a "audio control" button on the lower left corner
IT will bring up either the fade/balance screen or the equalizer. IF it brings up the fade/balance, there will be an "equalizer" button on the bottom of the screen.
Press the up and down arrows to the left of the frequency that you want to adjust. to reset it to factory touch the button inbetween the arrows
Select the Done button
Hopefully that helps.
(It may be different from the above, these are pics of my mygig in my caliber)