Fuse box Audi A4 (B8) Fuse box in passenger compartment Audi A4 (B8). fuse box location. The various electrical circuits are protected by fuses. The fuse boxes are located behind covers on the left and right sides of the dash panel and in the compartment on the right side of the boot. Fuse Box Diagram Audi A4/S4 (B9/8W; 2017-2019..) In this article, we consider the fifth-generation Audi A4 / S4 (B9/8W), produced from 2017 to the present. Here you will find fuse box diagrams of Audi A4 and S4 2017 and 2018, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout).