Next diagnostic steps for E70 Power Tailgate not working?

[dchang0]

Originally Posted by ard

water into the rear electronics bay damaging the tailgate control module seems to be common. Have you ruled that out? (water corrosion seems a massive hint. Shining up the pins might not have fixed it....)

I opened up the tailgate control module (it's very easy to do, the bottom flips open) and looked at the PCB.



There does not appear to be any water damage to the module aside from the corroded connector. Of course, there could be damage that I don't see, but I think the corroded input connector blocked the water from getting further into the tailgate module.