Car Stereo Radio Wiring Diagram - 1991 Honda Accord Whether your an expert installer or a novice enthusiast with a 1991 Honda Accord, an automotive wiring diagram can save yourself time and headaches. One of the most time consuming tasks with installing a car stereo, car radio, car speakers, car amplifier, car navigation or any mobile electronics is identifying the correct wires for a 1991 Honda Accord. 1991 Honda Accord | Stereo Wiring Diagram 1991 Honda Accord Speaker Sizes. Front Speakers Size: 6 1/2″ Speakers Rear Speakers Size: 6 1/2″ Speakers. The following information is currently not available: Radio Dimmer Wire Radio Amplifier Turn On Trigger Wire *If you know any of the above or any other missing information please use the comment box below to notify us.