What's the wiring routing to those heater blankets look like?
I'd like to use a set to heat my second row...
Sorry for the delay.
The harness for them is pretty long. The blankets have the same harness style as OEM: the seat back blanket plugs into the harness for the seat bottom blanket, and that plugs into the actual wiring harness.
The switch has 6 pins, and the harness goes to a black box that I think is a relay. A separate harness with 4 wires (ground, constant 12V, IGN 12V, and headlight power signal) also terminates in that box. A harness with 4 wires exits the box and plugs into the seat blanket harness.
I ran constant 12V (inline fuse right by the battery) from under the hood. I ran it through the fire wall and clipped it into the bundle of wires that goes from the interior fuse box under the trim panel by the door, then under the driver seat.
IGN 12V, ground, and the headlight / illumination power all ran from the center console area. I pulled the whole console except for the head unit. Spliced into the cigarette lighter power for IGN 12V, spliced into the illumination power that goes to the OEM seat heater switch, and used a bolt near the emergency brake for body ground.
Those wires all got wrapped together and zip tied to the OEM harness that runs along the driver side of the center console area, under the carpet, and then up under the seat.
Since the main harness is so long, I bundled it up and zip tied it, then plugged it in and re-installed the seat. It sits just behind the amp under the seat.
Everything is long enough you could probably reach the second row seats. You’ll have to extend the constant 12V line if you want to run it to the battery. You could fuse tap, but I didn’t want to do that for seat heaters.