Great site! Anyway I have read through all the forums and can't quite get the answer I'm looking for. I have a 2006 trailblazer with the 4x4 service light on and no lights on the selector switch (they light up on start up so they work) and of course no 4 wheel drive. I turn the selector switch on and off 2 and 4 wheel with no lights and no engaging noises or sounds. I have jacked the front tires up and turned the tires and the shaft doesn't turn, I have taking the actuator off and had someone turn the selector switch on and off while running and the actuator is not going in and out but there is power going to it as I tested it. I took it to a mechanic and put a code reader on it and it said no code faults which confused him as the 4x4 light is on. I have also taken the fuse out for a bit and back in with no fix. So basically wondering if its the selector switch or the actuator or something else. Thanks