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I don't have rear doors unless you mean the two-part tailgatewhat about the rear door? have you looked at the switch for the rear doors?
The tailgate switch is operated by the glass part of the hatch, via a plunger on the right rear pillar, just above the metal drop down tailgate. I'll have another go at it with the plunger disconnected and see it that workssome have barn doors and some have tailgates but both should have the door switch for the lights. I had a 94 Burb a long time ago that had the tailgate but I dont remember where the stitches were located, maybe up top right of the glass as that's where its located on the barn doors. man I miss my tailgate but the wife likes the barn doors.
If there is anything aftermarket, remove all the wires and repair any oem wire damage caused by splices , then diagnos.There's no evidence of an aftermarket alarm and I removed all the horrible interior LEDs and refitted incandescent bulbs.
With all the LEDs removed, it still won't lock. I haven't yet tried it with all the incandescent bulbs removed as well