Rear wipers and defroster do not work at all. Electrical problem some where. on 2005 Chevrolet Suburban 1500

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All the electrical does not work on the rear door. All the lights work but wipers and defroster do not. The problem is constant, has not been working for awhile. Need to get the problem resolved for this winter.
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Broken wire in harness or faulty ground? Checked all connectors? Got volt-ohmmeter to check for voltage and good grounds?
I have the same problem on my 2002 suburban checked all harness connectors between the body and rear door checked contunity at the rear window defogger replaced wiper motor checked all wiring connectors for corrosion and heat damage all good need to locate the body ground