This happened to me too. turns out the battery is dead and the key is turned on Accessory. the only solution is to replace the baterry witha charged one, charge the battery, or possibly jump start it. I charged mine and it solved the problem.
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The remote start bypasses the ignition portion of the antitheft security system to allow you to remotely start the truck. But the system still needs the signal from the key to allow the vehicle to remain running and drive. I would assume the ignition is bad or needs to be trained to the system if it was replaced.
I doubt there is a common cause. The rear HVAC needs to be diagnosed by a HVAC technician. The electric windows problem is probably a bad motor in the door. Do the rear windows work from the driver's controls? If they do, then it is the window switch that is faulty.
If your 2002 gmc envoy or sierra will not even turn over with a kown good battery try starting it in nuetral then go back to park and try starting again. There is a park nuetral safety switch that can malfunction. Turn the key on then shift into nuetral, then turn fully to start.