Amp turn on lead for Entune system

Hey all- I have a 2015 Tacoma Access cab, and want to add an amp...or two.
The wiring harness diagrams show Leads H and I to use for this purpose. The plug on mine is empty in those slots, although there are pins coming out of the head unit. Does anyone know if they still serve that purpose? Do I simply need to add receptacles to the pin connector?

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Honestly, when running two amps its best to run a 12v wire with relay and fuse to power them on/off. You can use anything in the truck that turns on/off with the key to trigger the relay and tell it to send power to the amps to turn them on.

I do not suggest tapping into any stock wires for any reasons.