AUDI A3 Wiring Diagrams - Car Electrical Wiring Diagram AUDI A3 Wiring Diagrams. A3 Power Windows, 3-door models (with Pinch Protection), Driver's Side Wiring Diagram. A3 ABS Anti-Lock Braking System and Control Unit Connector Schematics. A3 Engine Management System 1.6 l Circuit Diagram. A3 Engine Management System 1.8 L without Turbocharger Wiring Diagram.