I've been vexed by the same problem for years. Resigned myself to watching the clamshell shut in the side rear view. Thats when you let the button go.
Both the factory manual and the Bentley manual have diagnosis regimes that involve running around with a volt-meter pushing buttons. Their both pretty arcane, confusing and lengthy so I've never really completed the tests. I have though tested all the switches I know of and they seem fine.
I've posted a similar cryout on several forums and have never gotten satisfaction. So I'm going wish you good luck and follow your thread.
Regards, PK
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