Just checked it and it is not working. NONE of my back brake lights or the back turn signals are wor

My 2008 Cobalt LT came with factory installed cruise control. I went to use it the other day and when I pushed the button on the steering wheel to turn it on the light on it came on like it was on. BUT when I hit set nothing happened and the cruise control didn't set. I have not replaced any tail lights or done any modifications to the car. What should I check to try to figure out why it isn't working?
Just checked it and it is not working. NONE of my back brake lights or the back turn signals are working. Checked the fuse relay labeled CHMSL in Engine Compartment Fuse Block and both seem fine. Also checked fuse #9 in the Floor console fuse block and it is fine. My back lights do blink when I unlock my doors, my headlights r working fine, and my front turn signal jennifer chapin fairmont hotels lights blink when turned on. I have no idea what else to check. If any1 has any clue what this could be or how to go about figuring out what it might be please help. Me and my kids have a trip coming up this weekend that we can't miss and have to drive my car there.
You seem to have lost all tail lights. Did you check all the BCM fuses(3) maybe one of those burnt. 2 in the underhood fuse block and one in the trunk. Blinker and brake plus tail all come from the BCM, so maybe one of the B+ busses has no power.
Thank you so much for your help. I replaced all 3 bulbs in my Center High Mount Stop Lamp and the bulbs in both tail lamps/turn signals and both are working. Cruise Control is also working now!!! But I still have no back turn signals.... the front turn signals are working. Any idea what I should check next to figure out why back turn signals are not working?? jennifer chapin fairmont hotels Also my back hazard flashers are not working but the front ones are....
Got turn signals fixed!!! I had the right bulbs in. The back turn signal lights in my Cobalt use a 3057 and the front uses a 3157. But after checking everything again and another trip to the auto parts store I figured out that the bulbs I had bought for my tail lamps/turn signals were defective. Replaced them with a new set and all my back lights are working!! Thank you so much for all your help. I now have working back lights and cruise control..... now I can focus on trying to figure out why the service airbag light is on and the passenger side airbag is staying off... then I'd be all set LOL