The following wiring diagram applies for Volvo S60, S60R, and S80 2004 models. Find detail information about the electrical system, wiring harness and diagram of the vehicles in the manual. The manual is divided into sections which covers discussion on Electrical Distribution, Fuses, Relays/Shunts, Ground connections, Control Modules, Engine Management System, Cooling Fan, Cruise Control, Power Supply, Starting System, Lamps and Indicators, etc.
Find more information about Volvo Wiring Diagram S60/S60R/S80 2004 here (199 pages of pdf file. PASS:wiringdiagrams21.com)