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I can't find a photo for that part #, I'm guessing it's the one with the twist knob at the end for the wiper frequency? I've got a spare wiper switch, but it's off a base model Hardbody, so it doesn't have the intermittent function. I haven't checked whether the plug is the same. (Edit: just checked, yep, same plug. Plugged it into my '93, works fine. The intermittent function is a separate two-pin plug.) Gonna have to be more careful with mine. I didn't realize they were unobtanium.

I was going to say there's no way this primitive ABS system could tell if the rear brakes were working, but I just checked the service manual and among the codes you'd expect there's a code just marked "other" (code 5). The diagnostic procedure for "other" is to overhaul the rear brakes, and if that doesn't do it, replace the ABS brain. The manual offers no further explanation. There's no cutaway or hydraulic diagram for the actuator, probably because they didn't expect anyone to take it apart. The electrical diagram shows an unmarked switch inside the actuator that I would lay money is a shuttle or a pressure switch or something of that nature, and would explain this mystery code, if only they'd been bothered to label it. So, yeah, I don't know how it knew what was wrong, but it sounds like it did, and you did exactly what the manual calls for! Mine was boring. It just coded for an open speed sensor circuit when it got wet.