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Dealership says the tail light is leaking which allowed water into the plug and corroded everything. Also ruined the blind spot module as well due to the moisture. Of course my extended warranty doesn't cover corrosion. So they have to replace the pigtail and the light. Hopefully this fixes the...

I tried removing the BSM from the light and plugged the light back in. Still has the issues. But the BSM module looks like it has discoloration around the pins in it.

How can I test it to see if there's a bad connection or possibly a ground fault I'm the plug?

I replaced the lights with recons cause one of them had moisture in them. Thought that was the issue but all these problems started happening before replacing the lights. The connector plug does look discolored from corrosion. Hoping the dealership in town with have an answer for me tomorrow...

Well the problem came back and won't go away unless I unplug my right signal light. This makes no sense at all.

Also not mentioned in my reply, there was visible corrosion in the plug and I could see water/moisture in the plug as well.

I just had this same issue happen to me. Truck was showing right rear signal light not working. Started dinging on the dash about the blind spot not working. Radio goes off and heats in full blast. All the same symptoms. Took the light off and unplugged it to see if the problem resolved and it...