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Any idea what this disconnected cable/harness is?

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Just did a DIY rattle repair on the front defroster vent diffuser/grille on my 2014 MS. This required taking apart a significant part of the dash (top pad, instrument bezel, bottom pad, glovebox, etc...).

Upon reinstallation of the drivers side dash components (specifically the instrument side panel cover), when I went to plug in the key antenna harness, I couldn't - it wouldn't fit (wrong shape, round vs rectangular). Odd, I thought. Well, I fished out the correct harness, but had no idea what the rouge harness was to be plugged back into. I didn't touch the amplifier or anything else on that side other than trim (I have the UHFS option).

Anyone have any ideas? I didn't snap a picture, but I took a screenshot from a YouTube installation video. Here it is, circled:

Screen Shot 2021-10-26 at 10.01.13 AM.png


Ideas anyone?