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Q: back hatch door & glass don't lock on 2003 GMC Yukon XL 2500

My back door and glass will not lock with the remote or with the buttons to lock all doors. There is no key slot. What is likely the cause? How can I fix it?
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I am not very experienced with Chevy hopefully some with Chevy knowledge will post response but I would check the fuses first and then look for broken wires in the harness that brings powers and grounds out to the rear hatch. Wires are usually in a rubber sheathing or hose between the hatch and the door opening. There is a 20 Amp fuse in the left side instrument panel fuse box that may be identified as "Locks" that supplies power to the rear lock solenoid. There is both an open and a close relay in the circuit as well that amongst other things could be the problem.
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