The vacuum switch shouldn’t make Substantially sounds, not adequate to be bewildered with a little something working. What I think is you will be Listening to the encoder motor on the transfer scenario seeking to shift it into 4wd.
It Seems “electrical†to me… appropriately, the primary place I’d start wanting is for the TCCM for corrosion. Then, I’d Look into the schematics posted inside of this thread and start seeking sensors.
I can’t thanks ample for this weblog. I acquired a 95 Jimmy on an impound auction for $320. I got it began, and guaranteed more than enough no 4 wheel push. I discovered the sprint buttons gave the look of they didn’t click, they lit up when ingnition was turned on, then two hi stayed lit, thats all I could get them to perform. So I grabed onto the two wheel button and gave a little tug and it poped suitable out with the dash.
) — check that fuse! (Fuse #eight, I believe — it’s NOT stated as having anything at all to carry out Together with the 4WD technique — I discovered that through the schematics.) There are three fuses that I am informed of getting to carry out with the 4WD technique — on beneath the hood (20A), a person inside the dash fuse paned (10A) and the opposite would be the courtesy lights (15A, I think).
It only took a couple of minutes to Identify the module and the trouble was Plainly obvious just after removing the module with the frame to possess a nearer look. The wires/plug connector were terribly corroded on several pins — which led to two damaged wires (pin #1, grey w/ black and pin #six, orange).
There exists a schematic (on web page 1) of your front axle change — it seems to become tied to floor by means of a “pull-down†resistor. When engaged, it ought to be pulled superior (+5VDC or +12VDC, I don’t know what it’s using to the switch).
What it truly is is a nut no much larger than my thumb with three vacuum strains into just one stop and what seems to be a spring loaded ball on the opposing conclude. The one which I took off my blazer I can easily push this ball out and in in the casing.
Your comment about moving into slippery circumstances plus the 2Hi mild goes out… The one thing I am able to imagine is the TCCM (Transfer Case Command Module) can have corroded wires, which was the original topic of this thread. Does this occur automatically whenever you go into slippery hyperlink circumstances?
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It feels like the gears are partaking from the transfer situation but I don’t hear the actuator engaging and the lights about the dash don’t come on. Any strategies?
Sad to say, your questions are very vague and seem much like each individual other dilemma, as explained higher than.
This may or could not be related to your trouble, but another thing I'm able to tell you is to get it looked at ASAP.
Take a look at the schematic “front axel switch & pcm.jpg†— and then have Yet another consider the wires to the TCCM (Transfer Case Management Module), Found underneath the passengers kick panel.
PS – I really hope I’m not way off base below and sending you on the wild Goose chase, but it surely’s really hard if you can’t see the motor vehicle.