Hi,
To the best of my knowledge, there should be a manual way of doing it. However, I am not able to find anything related to it in the manuals. I remember on the older ones, there was a knob in the trunk which would operate it manually, but this doesn't seem to have that option.
Here is what I suggest trying. The vehicle should have the CAN system scanned for diagnostic trouble codes. CAN stands for controller area network. Basically, all the computers/modules are tied together via a few wires. By scanning the can, it should identify if the problem is related to a position sensor failure, module failure, and so on.
Here is a quick video showing how it is done:
https://youtu.be/InIlnsjOVFA
If you can, have this done and let me know what codes are found.
Take care,
Joe
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Tuesday, May 4th, 2021 AT 7:32 PM