2009 Honda Civic Car Stereo Wiring Diagram - ModifiedLife Whether your an expert Honda Civic mobile electronics installer, Honda Civic fanatic, or a novice Honda Civic enthusiast with a 2009 Honda Civic, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2009 Honda Civic vehicles are becoming increasing more difficult to identify due to the installation of more advanced factory oem electronics. 2009 Honda Civic OE Wiring Harnesses & Stereo Adapters Honda Civic 2009, Aftermarket Radio Wiring Harness by Metra®, with OEM Plug. For aftermarket stereo. Metra preassembled wiring harnesses can make your car stereo installation seamless, or at least a lot simpler.