Fuse Box Diagram > Mazda 3 (BP; 2019-.) Fuse box diagram: Mazda 3 (BP; 2019-.) Cigar lighter / power outlet fuses in the Mazda 3 are the fuses F15 and F30 in the Engine compartment fuse box. Fuse box in the passenger compartment. The fuse box is located on the left side of the vehicle, behind the cover. Fuse box diagram . Fuse box Mazda 3 2003-2009 - fusesdiagram Fuse box in engine compartment Mazda 3. fuse box location. fuse box layout. R1. Front fog lamp relay. R2. Horn relay. R3. Heated rear window relay. R4.