2004 Saturn vue new infotainment install

[Detroitlions33]

Hi im currently in the process of switching put my factory 2004 saturn vue stereo head unit and putting in a touch screen. There is a wire that slides on to the old unit via a metal tab. Does anyone know what this is for?? The new touch screen does not have this metal tab and i had it installed and it was working but didnt leave it hooked up because of this. I have some pictures of said wire.

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