The dash is mounted on the right leg or the overhead guard I believe. If so try pressing the asterisk key or star key until you see password come up. Try using all 5's for access. If this work you will need to go through the menu until you see the little service guy, battery menu is a submenu there. If that does not work, someone has changed the password and service program will be required. Should the display be mounted in the dash, press the star key multiple times until it says password. Try the same numbers, 55555. Should this work, menu should show on the screen. You will have to work your way through to find battery options as I do not remember. Again, if password does not work service program will be needed.