your on the right track, i got the same crap abs pump. my abs lights, brake light and t/c light were all on, i got it scanned and its not a hub or the wires to one, but something else. the abs pump on the master has been changed, and the ebcm as well. careful the one you buy needs to be the same part # theres no interchanging them if you replace it. must be the same part #.
you need to take the foot cover off under the dash and its up in the left side, mine had 3 plugs to it, the one in the back sucked to get off. you pretty much push it up and then to the side and it will un lock and you can move it around, i found if i unplugged the two plugs i could get to easy first, then pulled the unit out some then worked on the rear plug.
your year has a relay in the dash too, that maybe bad. i changed mine, no help either tho. if you pull off the side cover of the dash or look up from under it, its just a relay clipped to the dash frame on the drivers side.
i quit trying to fix mine. pulled the abs fuse, game over. ill live with the one yellow abs light on the dash.
if you've not had it scanned for abs codes, do that first.