The smaller box reads the cars can-bus (data) wires. The following wires are transmitted to the factory radio through the can-bus wires. The small box converts the following wires into analog signals that your aftermarket radio can read. Red- switched power turns the radio on and off with the key and keeps the radio on until you pull the key out of the cylinder. Orange- Illumination wire dims radio when you turn on your lights. Mint Green- Parking brake wire unlocks security features when your parking brake is engaged. Purple with White Stripe- Backup camera reverse wire tells radio to Initiate back-up camera screen when you are in reverse. Pink- Vehicle Speed Sense wire tells the radio how fast you are going to improve accuracy especially when you lose GPS or cellular signal.
This harness is designed to connect directly into radios that have an ISO pinout. If you are not installing a radio with an ISO pinout we have a PNP converter that allows you to connect to your new radio without cutting any wires.
Not all the wires on the cars harness will be used.
Featured positive reviews:
Worth every penny, make it easy on yourself05/31/2016 ByKyle Ditty Not much of a reviewer but here is the deal with my install: I spent around 35$ on Amazon for my install kit and harness adapter for my 06 Jetta TDI. The adapter that came worked fine, but I didn't shut my car off for a few hours after the install, when I arrived at work. I shut my car off and the radio stayed on, I had no way to turn it off except pull everything and unplug the harness, which really sucked.
I called my closest stereo guys, they didn't know exactly what I needed but offered to run a wire to my fuse box to kill the stereo, no thanks. I found the YT video from ENFIG and called back and let them know what I needed, they came back with 280$ just for the part. I bit the bullet and ordered this even though I felt it was a bit expensive, which it isn't compared to other people.
After everything was said and done, my stereo works fine and I don't have to risk my electrical system with a fuse to harness splice, and you shouldn't either.