The rear lift gate on my 2010 QX56 acts up when I go through a car wash. When I hit the button on the handle it will release but does not go up and I can hear some tiny beeps. I have to manually lift it up when this happens. I think moisture is getting in through the handle. It will work fine after the moisture dries out. The door will open and lift up automatically with no problems, so I had it checked at the dealership and they said it needs a new wiring harness due to corrosion and quoted me around $750. 
Any idea what the part number is so I can check online and do it myself. Also is there a way to seal where moisture is getting through?
Thanks in advance.

Any idea what the part number is so I can check online and do it myself. Also is there a way to seal where moisture is getting through?
Thanks in advance.
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