How to remove a instrument cluster on a 2002 chevy trailblazer lt

I would look to your ignition switch at a possible problem. Whacko clusters usually are caused by a bad switch on these.

It's been a while since I did one. First check the fuse. The n remove the knee bolster, Couple of screws at the bottom and pops of at the top. Remove the bezel screws under it. Look at the cluster, Could be 2 or 3 screws holding it the bezel there. Te bezel pretty much pops off from there. If it seems tight around the ash tray, pull the ash tray. There are 2 screws there. You have to have the key in the on position and pull down the column shifter to get the bezel out. There are 4 screws to remove the cluster. Unplug it and plug it back in, see if it starts working. If not, then you need to do some wire chasing. You'll need wiring schematics and pinouts for plugs. You could just replace the cluster. But I have never had to. Usually wiring/plugs. Once I replace a PCM.