Question What does the CI connector on my Lenovo IS8XM motherboard / casedo?

Aug 28, 2019
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Hi guys,

I have a ThinkCentre in front of me with a Lenovo IS8XM motherboard.
Next to a Fan-Connector, there is a connector called "CI". This is connected to a button that is placed at the case where the sidepanel closes it.
When the case is closed, the button is pushed.
Actually i can not see any change or any reaction while the button is pusehd or not (or the case is closed or not).

What does this button do or what is it for?
Or what is the CI connector for?

Thank you for any helpful reply