Hey I just recently picked up my second blazer and it just so happened to be a zr2 .. I'm having a problem with it not shifting into 4x4 .. The switch buttons light up and it shows it's in 2hi but I push another button and it does nothing ... No flash no sounds nothing .. When I turn the key on I hear a click from the tccm and all the lights come on for a second and then it shows that it's in 2hi .. Sometimes it will show that it's in auto 4wd but I don't think it's working .. Any help would be great ..thanks..*btw I done a lot of reading in the last few days and I found nothing similar