Today’s vehicles use hundreds of feet of wire. All of the wires are grouped and enclosed in wiring harnesses for protection and appearance. For testing purposes, each section of wiring harness is given its own name or code. To simplify testing and repair, think of each wiring harness separately. Engine Room Harness Electronic Fuel Injection Harness Air Conditioner Harness Door Harness Passenger Side Instrument Harness Console Harness Back Door Harness Door Harness, Driver’s Side Main Harness Fuse Block Engine Sub Harness 190 Auto Electricity and Electronics Copyright by Goodheart-Willcox Co., Inc.