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[idontknow via CarKB.com]

I can't figure it out. I have a 93 s15 jimmy with push button 4wd. When I
press the button, nothing happens, no blinking lights, no clicking. It
doesn't even try. If I am in revearse and push it, hi and lo blink, clicking
by glove box, but still no 4wd. I changed the vacuum switch at the transfer
case. No help. Found a hole in vacuum tube at actuator under battery.
Replaced it and it worked fine. A few hours later, started it, and it is not
working again. Doing the same thing. Anybody have any ideas??????

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[jshammer]

try pulling the crty lamp fuse for 30 secods to clear codes