How To Wire an Aftermarket Head Unit for a 2006 Audi A4 Oct 16, 2017I do not recommend the PAC C2R-Audi because the rear speakers are now very quiet. I RECOMMEND THE ENFIG HARNESS INSTEAD. That said, this is how to wire the PAC C2R-Audi in a 2006 A4 without BOSE 2006 Audi A4 Car Stereo Radio Wiring Diagram Whether your an expert Audi electronics installer or a novice Audi enthusiast with a 2006 Audi A4, a car stereo wiring diagram can save yourself a lot of time. One of the most time consuming tasks with installing an after market car stereo, car radio, car speakers, car amplifier, car navigation or any car electronics is identifying the correct color wires for a 2006 Audi A4.
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