This is a Quick DIY for Hardwiring a Radar Detector Power Cord into your NSX's Accessory Port Location on the Driver's Footwell Fuse Box. The process takes about 15-20 minutes, and is pretty straight forward:
1. First, Check your Main Fuse Box in the Engine Bay to ensure the Accessory Ports have been activated, by inserting a fuse into Position #17:
2. Next, Remove the Driver-Side Lower Kick Panel for Better Access to the Footwell Fuse Box, this is held in place by (2) Phillips Screws on the front, the rear is held in place by two plastic pins, covered in rubber bumpers:
3. Disconnect the two plastic connectors and place the panel aside; don't lose the rubber pin bumpers (or it will rattle):
4. Insert the Positive Cable end into Position C911, it's the 2nd connector out of the four. If your cable does not have a female spade connector you will need to crimp on one first, this position on your fuse panel provides power when the car is turned on, so it's ideal for accessories like a Radar Detector:
5. The metal surrounding the fuse box can be used for the negative terminal on the cable, I like to use the existing trim screw to hold this in place, so no modification to the car is necessary.
First slide the negative terminal under the plastic:
Ensure it's centered over the hole, and reinsert the trim screw:
6. At this point it's a good idea to connect your radar detector, and turn on the car, to ensure your power connections are working. Next we're going to run the wire so it's hidden from view:
Remove the Driver-Side A-Pillar Garnish, and use a coat hanger or weighted string to run the wire up through the lower hole. The Pillar Garnish snaps into place, but be careful removing it:
7. Remove the Driver-Side Visor:
8. With the visor removed, you can pull the headliner down, to tuck your wire into place.
First, Determine how much wire you need exposed, then tie a double-knot into the wire:
9. Next, Pull the headliner down, and tuck the hardwire into the gap. Make sure the knot is under the headliner:
Connect the wire to your detector, and reinstall the panels. The headliner is secured by the visor, and the A-Pillar Garnish snaps back into place.
I like to tuck the excess wire under the a-pillar garnish, where it's hidden from view:
The finished product, Detector turns on and off with the car, and there are no visible wires: