The Mazda CX-30 DM (2020) has two main fuse boxes: a passenger compartment panel with 23 positions F1-F23 and an engine-compartment panel with 56 positions F1-F56. The fuse assignments here refer to the documented 2020 European specification and cover lighting, power windows, engine management, safety systems, wipers and 12 V accessory outlets.
The exact circuit and fuse rating can differ between Skyactiv-G, Skyactiv-X and Skyactiv-D engines, European or other markets, and installed options. Pay particular attention to the alternative ratings at engine-bay F3 and F7, and the different cabin F22 assignment reported for some non-European specifications. The original labels and ratings are preserved below, including unused fuse positions.
Where are the Mazda CX-30 fuse boxes?
Passenger compartment: behind a lower dashboard or footwell trim cover on the left side of the cabin, near the driver’s feet on left-hand-drive vehicles. Turn off the ignition before carefully releasing the fuse panel cover. Access arrangements may differ on right-hand-drive cars.
Engine compartment: inside a covered fuse and power distribution box near the vehicle battery. Release the plastic lid catches with the ignition off and consult the fuse diagram inside the cover. Never attempt to replace a high-current MAIN link unless qualified to service the main electrical supply.
Mazda CX-30 2020 – cabin fuse box F1-F23
The cabin fuse panel protects central locking, electric windows, the optional power tailgate and driver seat, audio, rear lighting and the steering column lock. Positions without installed fuses remain in the table so the layout matches the original figure.
| Position | Amperage [A] | Protected circuit / function |
|---|---|---|
| F1 | – | Unoccupied position |
| F2 | – | Unoccupied position |
| F3 | – | Unoccupied position |
| F4 | 15 | Driver’s door central locking |
| F5 | 15 | Front passenger door central locking |
| F6 | – | Unoccupied position |
| F7 | 25 | Power tailgate, if equipped |
| F8 | – | Unoccupied position |
| F9 | 30 | Driver-side electric windows |
| F10 | 30 | Passenger-side electric windows |
| F11 | 30 | Power-adjustable driver’s seat, if equipped |
| F12 | – | Unoccupied position |
| F13 | 15 | Audio system |
| F14 | – | Unoccupied position |
| F15 | 15 | Tailgate lock |
| F16 | 15 | Lighting |
| F17 | 10 | Brake lights |
| F18 | 10 | Reversing lights |
| F19 | 10 | Rear turn signals |
| F20 | 10 | Rear position lights |
| F21 | 10 | Rear position lights |
| F22 | 7.5 | Electric steering column lock in European specification; other markets may use a different circuit |
| F23 | – | Unoccupied position |
On this European 2020 list, F22 is 7.5 A for the electronic steering column lock. Some other-market guides assign a different safety-related circuit to F22, so do not use a generic chart without checking the vehicle’s market-specific owner’s manual.
Mazda CX-30 2020 – engine compartment fuse box F1-F56
The front power distribution panel includes engine electronics, ABS/DSC, lighting, climate controls, starter, cooling fan, electrical steering assistance and accessory power. Several ratings and circuits depend on the powertrain.
| Position | Amperage [A] | Protected circuit / function |
|---|---|---|
| F1 | – | Unoccupied position |
| F2 | 20 | Heated windshield wiper resting area, if equipped |
| F3 | 30 / 20 | Engine management (30 A) or fuel injectors (20 A), depending on engine variant |
| F4 | 20 | S-VT variable valve timing system |
| F5 | 40 | Engine control system |
| F6 | 20 | S-VT system, depending on engine |
| F7 | 15 / 20 | Diesel fuel heater (15 A) or fuel pump (20 A), depending on engine |
| F8 | 15 | Engine management |
| F9 | 15 | Transmission control module, if fitted |
| F10 | 15 | Engine management |
| F11 | 7.5 | Air-conditioning |
| F12 | 15 | Engine management |
| F13 | 15 | NOx sensor, depending on engine |
| F14 | 20 | Front heated seats, if fitted |
| F15 | 20 | Headlamp washers, if fitted |
| F16 | 15 | Miscellaneous protected circuits |
| F17 | – | Unoccupied position |
| F18 | 15 | Accessory electrical supply circuits |
| F19 | 60 | Electric power steering |
| F20 | 15 | Left headlamp, circuit 1 |
| F21 | 15 | Right headlamp, circuit 1 |
| F22 | 15 | Keyless entry system |
| F23 | 30 | ABS and Dynamic Stability Control (DSC) |
| F24 | 15 | Left headlamp, circuit 2 |
| F25 | 15 | Right headlamp, circuit 2 |
| F26 | 7.5 | OBD diagnostic connector |
| F27 | 25 | Various electrical supply circuits |
| F28 | 25 | Various electrical supply circuits |
| F29 | 15 | Windscreen washer pump |
| F30 | 15 | 12 V accessory power outlets |
| F31 | 15 | Horn |
| F32 | 15 | Headlamp circuits |
| F33 | – | Unoccupied position |
| F34 | – | Unoccupied position |
| F35 | 50 | ABS / DSC system |
| F36 | – | Unoccupied position |
| F37 | 40 | Rear window defogger |
| F38 | 50 | Various electrical supply circuits |
| F39 | – | Unoccupied position |
| F40 | 40 | Climate control and cabin blower |
| F41 | – | Unoccupied position |
| F42 | 20 | Front windscreen wipers |
| F43 | 30 | Engine cooling fan |
| F44 | 30 | Starter motor |
| F45 | 10 | Engine control system |
| F46 | 15 | Audio system |
| F47 | 15 | Miscellaneous protected circuits |
| F48 | 7.5 | Airbag SRS system |
| F49 | 15 | Instrument cluster |
| F50 | 15 | Interior lighting |
| F51 | 25 | Audio system |
| F52 | 10 | Sunroof, if equipped |
| F53 | 15 | Engine management |
| F54 | 15 | i-ACTIVSENSE safety and driver assistance systems |
| F55 | 50 | Various protected circuits, depending on version |
| F56 | – | Unoccupied in the European 2020 specification |
Skyactiv-G, Skyactiv-X and Skyactiv-D fuse differences
F3: the source specifies 30 A for engine management or 20 A for fuel injectors, depending on the engine. F7: a diesel fuel heater may use 15 A, while the fuel pump circuit can be rated at 20 A for another powertrain. Never choose between these alternatives by trial and error; use the exact engine specification and its fuse label.
Engine-bay F56 is shown as unoccupied in this 2020 European source. Some later model-year layouts assign it differently, so the 2020 diagram should not be extended to 2022-2023 vehicles without verification.
Where are the 12 V socket, wiper, audio and rear defogger fuses?
For the 2020 model, the engine-bay 12 V power outlet fuse is F30 (15 A). Some optional accessory feeds use F18 (15 A). The washer pump uses F29 (15 A) and the front windscreen wipers F42 (20 A).
Audio is associated with cabin F13 (15 A), plus engine compartment F46 (15 A) and F51 (25 A). The rear window heater is supplied through engine-bay F37 (40 A). Disconnect any accessory and match the original rating before changing a fuse.
For another compact crossover that uses its own electrical architecture, see the Toyota Corolla Cross XG10 fuse diagrams. For a smaller crossover, the Kia XCeed CD fuse guide provides model-specific layouts. These are related size classes only: never transfer slot numbering from one car to another.
Mazda CX-30 2020 fuse box FAQ
Which fuse supplies the cigarette lighter or 12 V outlet?
The 2020 engine-compartment chart lists F30 as the 15 A accessory and 12 V power supply fuse.
Where are the windscreen wiper and washer fuses?
In the under-bonnet panel: F42 is 20 A for front wipers and F29 is 15 A for the washer pump.
Which fuses are assigned to infotainment and audio?
Cabin F13 is 15 A, and engine-compartment F46 and F51 are 15 A and 25 A respectively in this 2020 layout.
Can the 2020 diagram be used for every CX-30?
No. Fuse assignments vary with Skyactiv engine, market, equipment and model year. In particular, F3, F7, F22 and later-year F56 need a specific diagram.
Use identical fuse type and amperage when replacing a fuse. If it blows again, check the circuit rather than installing a higher-rated fuse.