The following Wiring Diagrams and Electrical Sytem Schematics apply for Audi S4 2001 model year. Here you will find complete diagrams, illustrations, and description of the electrical system, components, parts, connectors of the S4 which include Anti-lock Brakes System (Quattro, EDL, ESP), Airbag Control Module, Battery, Starter and Generator, Climate Control System, Cluster, Oil pressure, Fuel Pump and Oil Level Circuit Diagram, Driver Information System. Find more information about Audi S4 Wiring Diagrams and Electrical System Schematics