Under the switch diag. page, what is E2?  I have found it says "foot box".  What is that?

I can't get a hyd. seed module to work.  It keeps saying to put the planter on the ground.  I have a "closed" curcuit so the planter "should" be in the ground.  One of them days.  Took an hour to figure out I needed to unhook the ground strap on factory electric clutches on a Agco planter so I could configure it. AAAHHH.  

Overlooking something here?