2004 Nissan Sentra Car Stereo Radio Wiring Diagram Whether your an expert Nissan electronics installer or a novice Nissan enthusiast with a 2004 Nissan Sentra, 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 2004 Nissan Sentra. 2004 Nissan Sentra | Stereo Wiring Diagram 2004 Nissan Sentra. September 10th, 2012 Posted in Nissan Sentra. 2004 Nissan Sentra Stereo Wiring Information. Radio Constant 12v+ Wire: Pink Radio Switched 12v+ Wire: Blue The stereo wiring diagram listed above is provided “as is” without any kind of warranty. Use of the information above is at your own risk.