I just hardwired my 2015 Tacoma (entune without navigation) with a radar detector. It turns on and off automatically with the ignition and I mounted it to the rear view mirror so it is no longer suction-cupped to the windshield. The main reason I did this last part is because over time the suction cups eventually fail, especially in the winter and when going off road. It also allows me to use a sun shade in the summer without the hassle of the unit interfering.
I also hardwired my TomTom GPS unit underneath the factory head unit. I wired it to the +12v ignition wire from the radio, so it also turns on and off with the ignition. Here is what the finished product looks like:
The radar detector was wired exactly as demonstrated in the previous thread. The only difference is that my truck doesn't have the fancy electronic rearview mirror. When I got into the headliner I noticed that it came pre-wired for the fancy mirror though. At the end of the wires there is a factory harness with a blank adapter that is connected to nothing. All you have to do is wire your detector into the blank wire ports as shown in my photo. As for the rearview mirror mount, I used a hose clamp, a piece of angle bracket leftover from a wood working project and the mount that came with the detector. I sprayed them black with plasti-dip to match the interior and that's all there is to it.
The TomTom GPS was hardwired using a USB cigarette adapter, a MagicMount, a little bit of wire and two wire splices. Take a standard USB cigarette adapter and solder two wires on it; one for the power and one for the ground. Once you do that, wrap the assembly in electrical tape for safety.
To install your modified USB outlet; first pop off the temperature control panel underneath your stereo. Then remove the 4 bolts with a 10mm wrench. Pull the factory deck out and locate the two wires indicated in the photo. Splice your modified USB adapter to those two wires and reinstall the stereo, running your USB outlet down below to hide behind the temp control panel.
Now plug your TomTom's power cable into the USB outlet and stow any excess inside the dash. Reinstall the temperature control panel with the end of your GPS power cable sticking out a couple of inches. Take your MagicMount base and trim it with a razor blade or scissors to fit the width of the panel as shown in the photo. This is what it should look like once trimmed and installed with the wire hanging out.
Now you just have to plug your TomTom into the power cord and stick the unit to the mount you just installed. Done.
For those who are unfamiliar with what a MagicMount is, it's a universal, magnetic mount for any device. The base has double sided tape on one side, and a powerful magnet on the other. It comes with two metal plates that self adhere to your device. Your device can be pulled on and off the mount easily for updating the GPS maps, but it stays on strong because of the magnet. The base also pivots to give you the best view angle of your screen. This is what a MagicMount looks like:
I've had my Tacoma for 1 week and love it! This mod helps keep the interior looking clean and free of any rat-nets of wires. I didn't want to pay the outrageous fee to have navigation but I still like to have the option. My TomTom works great and comes with free map updates all the time. This was my way of solving those issues for next to nothing. These mods are 100% reversible. None of the factory wires were cut and I didn't make holes in anything. I hope you enjoy pictures!