I don't have my manual in front of me but I believe that each sensor should have a 3 volt range and I see yours have a little over a two volt range. Look in your combine operators manual and let me know what er56 says.
The header height resume sensor is the one on the Feeder House. It is right below the upper feeder house variable speed sheave on the left hand side. Make sure it is plugged in. I have seen a couple come unplugged due to corn stalks. There is a rod with two ball joints going from the feeder house frame to the sensor. I think the address is either E01 17 or 18. I will check for sure tomorrow at work and reply back.