Aftermarket Heated Seat Install Help?

Just trying to find the best place to tap in the harness. Can't seem to find any information on this for a 4th gen yet.
Anyone done it?
I am using the heat kit from Clazzio with the 22mm high/med/low buttons.

There are 4 connections to be made. Constant power, Switched Power, Illumination, and Ground.

https://www.clazzio.com/heated-seats.php

I thought about tapping into the harness that supplies power to the rear usb-c outlets but that doesn't seem to include an "illumination" wire, and the lights around the plug receptacle for the usb c power are always illuminated. And I cannot find a diagram for the harness.

Thanks!
Been out of the Tacoma game for a few years. Glad to see this forum is still buzzing.

 

Paging @caribe makaira - Always a great resource!