This is located on the driver side frame rail just below the back side of the door. Basically if you lay on the ground and look on that frame rail you will find it.
Here is a video that is on an S10 that is basically the same as your vehicle:
https://youtu.be/3RGTP2XUgp8
I attach process below from the manual as well.
Let us know if you have questions. Thanks
Images (Click to enlarge)
Jan 29, 2021 at 6:53 PM