88-91 sensor wire colors: EACV (IACV) - 2-wire connector (if car was DPFI, the connector is green) - one Blue with Yellow stripe and one Black with Yellow stripe. The 1991 Honda Civic Hatchback Radio Wiring Diagram is essential for any car enthusiast or DIYer looking to upgrade their vehicle's audio system. This comprehensive diagram shows the various wiring connections required to hook up a stereo head unit, amplifier, and speakers in order to enjoy your favorite tunes while driving.
Right Rear Speaker Wire (+): Red/Yellow Right Rear Speaker Wire (-): Brown/White The following information is currently not available: Radio Antenna Trigger Wire Radio Amplifier Turn On Wire Front Speaker Size Rear Speaker Size *If you know any of the above or any other missing information please use the comment box below to notify us.. The 91 Honda Civic wiring diagram stereo schematic identifies the specific color-coded circuits delivering constant 12-volt battery power, switched ignition power, ground, illumination, and multi-channel speaker signals from the vehicle chassis to the head unit, ensuring safe integration of aftermarket or factory audio components.