4wd switch?

Hi guys! my friend has a 99 trailblazer 4wd. Since he bought it, the 4wd switch on the dash does not show any lights on. Even if we press the buttons nothing would happen. So he has never tried 4wd!lol! I was wondering if any of you has had a similar problem. Could it be a blown fuse? we took the switch out one time to chek the conections and everything was fine! Could it be switch itself? thanks for any feedback!

Yes, check the 4wd fuse and see if voltage at the switch. Could have had problems with the 4wd so last owner pulled the fuse.

first, i dnt know why my thread is getting moved? maybe cause is a trailblazer? Its the same thing as a blazer. N e ways. I found the problem to the switch not having any lights on. The module was disconnected. module located on passenger side kick panel. we connected it back and we got the "Service 4wd" light? what do i do now? I have to read some of the threads on the forum to learn a little bit more!

: The most common problem we see with these systems is an encoder failure. This means the computer module that controls and monitors the 4WD shifting motor doesn’t know where it is. The computer needs to know the location of the shifting motor to perform correctly. If the computer loses location information it stops responding. Diagnostic codes can be extracted but, because you have not used your 4WD much it may be all that you have to do is to clear the computer so it can start over. Turn the ignition switch off and remove the fuse marked T-case (it should be a 20 amp fuse). Wait a minimum of 3 minutes then replace the fuse. Once the fuse is replaced turn the ignition switch on & off 5 times. Then start the engine and push the 4 Wheel HI button. If the system starts working, great. Be sure to exercise the 4WD system regularly to prevent a reoccurrence. If the problem returns then you need a technician familiar with your 4WD system to get into some diagnosis.
This is from CK Form posted by MYTOY.

wow thanks! thats some good info right there! I'll try it and keep you all updated!

See the FAQ section - I posted a 4wd fix to follow.