4x4 woint in gage put in 4 lo you can tell the trans is in 4 lo but the front wheels are not the lights do switch on the buttons from 2to 4high and 4 low

Check for codes .
Jumper pin 13 to ground and read codes on 4 wheel light.
Then remove T/L ctry 20 amp fuse for a minute and reinstall and recheck codes.
Post back codes.
MT

or you could try posting your question in a blazer forum instead of a cavalier forum