Toyota Prius Wiring Diagram and Electrical System Circuit As more electronics parts are introduced in automobiles recently, the electric wires used for the wire harness are increasing in number and the structure is becoming more complicated. This wiring diagram, cable harness routing and electrical system circuit apply for Toyota Prius 2005 model year. Toyota Prius - Wiring Diagrams Workshop and Repair manuals, Service & Owner's manual. Wiring Diagrams, Spare Parts Catalogue, Fault codes free download 2005 Prius wiring diagram discrepancy | PriusChat I have two wiring diagrams for my 2005 Prius, but they don't match on the section with which I am having a problem. The first is from adhol (Automotive Hobbyists), which I believe is now wiring-diagram. The second I believe is a snippet from Toyota that I downloaded from toyotaanswer. First, let me describe my problem..