when you finish swapping your 249 for a 242, everything goes smoothly except for the VIC plug change. You test the zj first, 4wd works fine, no problems, nothing on the VIC, and you wonder why to bother changing the plugs behind the VIC. Say "Screw it, lets find out." you then remove the VIC, unplug the red plug and plug the black plug together instead. And poof. "service 4wd switch" rears it's ugly head and annoys the crap out of you.
so, having the wrong plug installed = nothing on the VIC, no warnings, no problems. plugging in the RIGHT one in it's place = annoying complaints and a sudden urge to throw out, then back over, the stupid VIC.