That would be step #2, first the grey connector must come off. Book says it goes to the right, but as I look at the schematics it seems to show it removes straight up like the other plugs. I'm not sure if the black tab has anything to do w locking the plug on or not?
Its hard to see but there is a black tab on the left side of the grey plug. Not sure if that tab is a lock that goes up or dn or ??