Originally Posted by
Shamrock
Best guess is that the rear bow is not latched. Try latching it manually with the top tool. If it is latched, probably a problem with the latch mechanism. I believe there is a micro switch that indicates that the rear bow is latched. I'll look at the wiring diagrams tomorrow and post some more info.
The OEM top tool is for the tonneau latch, not the bow latch.
For that you need a 6 mm hex, or one of the MB tools that has both on it.