I'm not sure about 2WDs, but 4WDs use 2 bolts at the front of the radius arms, & they're SUPER tight. The specs are in this diagram. You also have to pull the lower shock bolt, but there's not much more to getting it out. You might have to pull the axle beam forward OR grind off the rivets at the rear frame bracket #6 to get the arm out, though.
Have you inspected the wiring to the DRL module? It's under the L headlight inside the grille valance. I suspect it got pinched.