Menu navigation - combined instrument panel
The menus shown on the information display in the combined instrument panel are controlled with the left-hand stalk switch. Which menus are shown depends on the key position.
Information display (analogue combined instrument panel) and menu navigation controls.
Information displays (digital combined instrument panel) and controls for menu navigation.
OK - access the menu, acknowledge messages and confirm menu selections. 
Thumbwheel – browse between menu options. 
RESET - reset data in the selected trip computer step and go back in the menu structure.
If there is a message then it must be acknowledged with OK in order that the menus shall be shown.