Free online viewing of 2008-2011 Ford Focus Service Repair Manual + Wiring Diagrams PDF - full service manual in your browser.. Our comprehensive 2011 Ford Focus radio wiring diagram shows all the radio wire harness colors, speaker wire colors, and speaker sizes. Use this head unit pinout guide to help with your car stereo installation or to troubleshoot radio wiring issues in your 2011 Ford Focus.
The 2011 Ford Focus stereo wiring diagram includes specific instructions for connecting the speakers to the head unit. It is important to pay special attention to the polarity and resistance values on the diagram.. 2011 Ford Focus Stereo Wiring Information Radio Battery Constant 12v+ Wire: White/Red Radio Accessory Switched 12v+ Wire: This vehicle uses the can data network for accessory turn on. Radio Ground Wire: Black/Blue Radio Illumination Wire: This vehicle uses the can data network for illumination controls.