I just had the same problem and finally found the fix. My problem was for a 2005 trailblazer. There should be fuse box under one of the rear seats. Look in your manual. The fuse will not say accessory power outlets, but will read Auxiliary Power and should be a 20w fuse. I just fixed mine and they all now work again. Hope this helped. Forget the other guys posting.
there is access panel you have to open
The best and fastest way to reset the instrument panel of 2004 Trailblazer is to disconnect both battery terminals. Reconnect them after about 30 minutes and everything should be reset.
The panel light dimmer switch is turned off. The panel light fuse is blown. The panel light bulbs are blown out.
it's under the hood
why would you do that?
no, uses electronic ICP (instrument control panel)
6 1/2 inch Round. Entire door panel must be removed. Do not try to remove grill as it is a fixed part of the door panel.
Simple procedure is well documented at our Trailblazer enthusiasts forum www.trailvoy.com Article section for replacing door speakers!
take off the inside panel and tighten the mirror. I did it and it is easy once you get the panel off which is not so easy.
We have a complete "how to" with pictures at our enthusiasts forum www.trailvoy.com
The plastic inside body panel must be removed to access the nuts and bolts of the assembly. The plastic panel will pull off if you start at one edge and work your way around slowly. www.trailvoy.com All the answers for your Trailblazer from true enthusiasts!
Should be located in the passenger side kick panel.