If you have a manual, you don't have or can't access that same grommet in the video. However, there is another one in the same spot on the passenger side. You just need to remove the battery, and use a sharp object or a long screwdriver (like guy above said to do) to poke through the firewall padding in the cabin. I also removed the grommet when I did this, and scored the grommet to start the cable feed thru it.
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