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What would this sensor be?

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In order to provide some extra ventilation for the third-row-victims, I would like to add some fans behind the speaker grill of the boot. (I do not have the fancy audio system).
After removal of the grill, I found there's probably enough space to o so, and I would be able to find some 12Vwiring to power the fans. But there's this weird thingie - anyone has an idea what it's about?
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