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What does this fuse do? (after camera installation by 3rd party)

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I had my Rexing dashcam installed by BestBuy and they used the manufacturer's hardwire kit.


The technician connected the 2 probes from the hardwire kit to:

  • Red wire into slot 5: Ignition (Unit IG2-2)
  • Yellow wire into slot 22: Seat Heater Right


My question is: what is "Unit IG2-2"?



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