Power button not work

check for power at switch power in power out if switch is good you have a bad actuator check for voltage first at actuator before youreplace

If the sunroof is anything like the power windows, the auto function has to be reprogrammed by holding down a bout 5 seconds, up about 5 seconds, down about 5 seconds and up about 5 seconds. I know there is probably a faster way, but since that way works, I wouldn't want to hand out any other kind of advice.

may have a bad switch

If, when you hit the button, you do not hear anything at all, it is most likely the power window motor is burned out. If you hit the button, and can hear the motor running in the door, your window is either off it's track, or the motor is worn out where it connects to the cracking mechanism and is not catching it. Popping off the door panel will give you access and you'll be able to see first hand what it is doing once you hit the button. Less likely reasons are a disconnected switch, wire short at the switch, or condensation on the switch.

Could be almost anything from window motor to wires to relay to window button. You could start at the window button and test power to motor, then eliminate relay until you find where power is out. If power is going to window motor and it does not work, its a bad motor.

Glass shops can fix this for you.

If the alarm is aftermarket I would remove it , I see this problem several times a month , take a test light and test for power at the starter signal wire while someone turns the key to crank this is the small gauge wire going into starter,if there is no power at this wire it will not crank ,if you momentarily apply voltage to the starter signal wire it will crank( also check starter signal fuse)(most alarm systems have a starter interrupt system ,and the aftermarket alarms fail after a few years) Alot of people believe there alarm is factory because it was there when they bought it new but dealer do add alarms that are aftermarket to please there insurance companies

Does the sun roof do anything whebn you press the button. if not, check your fuses and the sun roof switch. If fuses are good you want to check to see if the sun roof motor is getting power. If it is getting power it could be the motor itself. If it tries to move but can't then you have a mechanical problem. it might be binding so try giving it an assist by pushing on it when pressing the switch.

both the rear passenger side wont unlock ???? How many doors are on the passenger side ? Or both back doors don't unlock ? Two relays lock / unlock the back door's Not the lift gate . The BCM controls the relay's . The relay's are located in the rear fuse box . Under back seat .

if you have any knowledge of automotivce electrical, (and that you need to use a "circuit tester" and not a test light) test for power when someone presses the button. it wouldnt be uncommon for most vehicles for the lock actuator/solenoid/duty actuator to wear out, get weak and fail. this is most probable. given that this is an 08, have you checked withe dealer to see if its still under warranty. if we are only talking a few miles and they wont do anything, look in your owners handbook and get the 1 800 number and get GM's customer service involved. cheers.

Start out with buying yourself a $25 book from the Parts House. The I would go to the front HUBS, secure & safety vehicle before you do anything, Clean, Inspect, Lune & Repair front Hubs as required, get the brakes while you're there. Check your drive line, axles, u-joints etc. Clean , repair , replace as needed. Check for Tranfer case Operation. Is there power going to the front Axle when 4WD is engaged? do you feel a change when you engage the Transfer Case? Have you checked the Power on the circuits? Have you Manual or Auto-locking Front Hubs? Answer all those Questions & read before you do anything.