This video demonstrates the BMW 3 Series Complete Wiring Diagrams and details of the wiring harness. Diagrams for the following systems are included : Rad.. Stereo Wiring Diagrams Jan 10, 2022Stereo Wiring Diagrams. Welcome to Stereowiringdiagram, one of the leading websites for car stereo color coded diagrams. We carry common radio/stereo wiring information for the majority of vehicles made by common automakers. To start things off select your automaker below, from there you’ll be able to select your vehicles year and model. Wiring Diagrams for Car Radio - Car Audio Help Below I have put together some of the best free sources for car stereo wiring diagrams and wiring colors. The first resource is best for finding the power wires for your car. The second two deal more with wiring diagrams for car radio. the12Volt Wiring Diagrams - This site is provided by the12volt and is extensive. Radio Wiring Diagram Needed! | BMW Luxury Touring Community Mar 26, 2017I'm facing a big prob today about this, and your 2012 answer. I did use attached wiring diagram : wiring a standard 1A USB power converter (12v to 5v) to pins 15 for ground and 5 for switched power supply. Actually this diagram shows Pin 5 is an input ("Eingang" german speaking) for the radio.