Hi all, sorry too dredge up the thread, but the question was asked here but not fully answered. I have used the following
https://www.ebay.com.au/itm/323374473773 mechanism in the rear tailgate for my SR5 luxy.
To answer the few questions that came up in the thread -
I routed the cable using the same route that the tailgate brake light uses, to get from the tailgate into the underside of the rear of the tub. Then along the upper and inside of the LHS chassis rail. Cable tying to existing routes as i went. A second pair of hands or a coat hanger are your friend here to fish the cables through.
From there i used the floor grommet that is located just under the passenger side front seat, came from there across to the front passenger side kick panel and patched straight into the cables connecting into the black J13 connector. Saved the need to break into or get over to the drivers side, the route for which i just could not figure out.
For clarity, the solid red cable is powered to lock the car, either with the key or the button on the drivers side, and the red-yellow is powered for the unlock operation.
Relatively seamless once installed, and it essentially prevents the handle from moving at all once installed and in the locked position. Gives an extra level of protection for what ever you may have in the rear.