We have a GS2600 display in our tractor for seeding and one in our 4720 sprayer. On both displays the "J" button ","1 2 3 totals"is non functional.Is there something,I need to do to make them work? Or has anyone else had the same problem.

PS. I am pretty sure i have all the info filled out for documentation, as all the other functions seem to work properly.