Has anyone retrofit the parking assist (sensors, computer module) into an HS that did not come with it? My understanding is the care is hardwired for it and the computer is programmed, it is simply a matter of installing the sensors and hooking them up to wiring that already runs inside the bumpers. Is that true?

 

I'd guess it would be virtually impossible.

I'd guess that the car with park assist has a completely different wiring loom than the one without. I doubt that they just tied back all the wires and plugs for the sensors and left them there to get damaged or corrode under the bumper.

I could be wrong, after all it is a Lexus and the Japanese do some strange things in the manufacture of their cars.