What is the Tesla HVIL?

This is really part 2 of the BMS video, because I forgot to cover it:
https://youtu.be/SoiItQZBthg

Here we cover a little-known but important safety system that not just Teslas have, but all EVs and Hybrids; The High Voltage Interlock Loop.

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Link to Tesla's HVIL troubleshooting guide for the older Model S (Courtesy of NHTSA): https://static.nhtsa.gov/odi/tsbs/2014/SB-10052449-4313.pdf

Texas Instruments HVIL reference design: https://www.ti.com/lit/pdf/tidud43a

Tesla's First Responder information: https://www.tesla.com/firstresponders