So I have searched around on multiple posts and haven't found any SOLID response as to where it is on my vehicle, I have torn apart most of the stuff under the dash and glove box and can't seem to locate it.

My 4x4 was stuck in 4lo today and took me a couple of hours of messing with stuff around the transfer case and some other random parts under the dash til I could get it out of 4low, then it just clicked into 4high and I can't seem to get it out of that gear now.

The 4 high and low work, just intermittently so I don't think its the encoder motor, just thinking I may just need to reset the TCCM hence my question. Any other insight may help me out a bit, at work right now trying to mess with stuff.

 

if your is like mine then the tccm is behind the pass kick panel under the dash.
i dont know the diff between the 97 and 99 but my brother was having a problem that was similar where all the mech parts worked but the elec parts had a mind of their own. it turned out to be the switch in the dash with the buttons on it. we swapped it for a spare i had and all was good.
also there is a 4x4 diagnoses write up in the tech section.

 

Its in the same spot on the blazer, pas front pillar. Same as this Tahoe. Easy.

 

Yup found it, didn't need to take apart everything that I did, but oh well. Found it. Unplugging it and letting it reset allowed me to get it from 4low into 4high(that thing I played with earlier WAS the tccm, just didntk now it) but now stuck in 4high. Next thing I will try is to pull the fuse, wait 10 mins, and cycle my ignition to accessory and off 5x. This should give me some of the malfunction codes correct? Fuse #19 "4wd" 20a <----correct fuse?


**** I know there are plenty of write-ups on this site, problem is i'm on a work computer that is from the stoneage and this thing crashes like crazy so it's a pain searching and browsing without resetting this **** every 3 minutes, so i'm staying on my thread since it will actually let me view this page ! ( sorry for the inconvenience).***

 

**Update**

So I got it out of 4-High finally. I went ahead and d/c the TCCM harness and let that stay out for a good 45 mins or so and re-plugged it back in. Went ahead and started the truck, it wouldn't click back into 2-Hi with the car on. So I turned the car off and putt it into Accessory and slid it into neutral, with it in neutral I was able to click it back into 2-Hi ! (Semi-Success !!!) my 4x4 will still need some looking into but I did get to my goal tonight, so all in all success. Thanks for the tips on where to find the TCCM helped a lot. Next step.....FIX the 4x4 haha.