Few days ago I installed a Frameless Auto Dim Rear View Mirror w/Homelink in my son's GR4.
Install is fairly straight forward. I used Posi-Tap Taps 22ga to tap into wires of forward collision/sign reading camera (16 pin connection pictured below). I used pin 2 and 9 (red and black wires) to power the mirror and V1 radar detector. Added a dash cam as well (needs a power adapter). Taking cover off is not that difficult, followed instructions in this video.
Hope this helps..
Install is fairly straight forward. I used Posi-Tap Taps 22ga to tap into wires of forward collision/sign reading camera (16 pin connection pictured below). I used pin 2 and 9 (red and black wires) to power the mirror and V1 radar detector. Added a dash cam as well (needs a power adapter). Taking cover off is not that difficult, followed instructions in this video.
Hope this helps..