Locate the interior power distribution unit under the dashboard on the driver side and check the label inside the cover before replacing any blown element, as each slot is assigned to a specific circuit with a fixed amperage rating. Small ratings such as 5A or 10A usually protect sensors and control modules, while 15A–25A positions support systems like wipers and power outlets.
Open the engine compartment electrical center near the battery to access high-current protection links, where cooling fans, ignition supply, and charging circuits are grouped. These positions often use larger cartridge-style components rated from 30A to 80A, and require careful inspection for heat damage or loose contacts.
Match slot numbers with the printed layout and verify continuity using a multimeter, since internal breaks may not be visible. Testing both terminals ensures proper current flow, helping isolate faults in lighting, infotainment, or driver assistance systems without unnecessary part replacement.
Mazda CX30 Fuse Box Diagram with Panel Locations and Circuit Details
Check the interior power distribution unit first, located behind the lower dashboard trim on the driver side, as it contains the majority of low-amperage circuits such as lighting, infotainment, and control modules.
This compact crossover uses two main electrical protection centers: one inside the cabin and another under the hood. The interior unit typically includes slots rated between 7.5A and 20A, while the engine compartment assembly handles higher loads like cooling fans, ABS, and ignition systems with ratings up to 60A.
Interior module layout details: each slot is labeled with a number corresponding to a specific circuit. For example, positions often include:
- Slot 1–5: audio system, display screen, USB ports
- Slot 6–10: cabin lighting, instrument cluster, steering controls
- Slot 11–15: power windows, door locks, mirror adjustment
Engine bay unit mapping: this section is mounted near the battery and includes relay blocks along with high-capacity links. Common assignments include:
- Main cooling fan relay and 40A protection link
- ABS pump circuit with 30A rating
- Engine control unit supply line around 15A
Each position is identified by a molded cover legend showing circuit names and amperage. If the cover is missing, refer to stamped numbering on the plastic housing and match it with a service manual reference chart.
Color coding helps quick identification: red indicates 10A, blue 15A, yellow 20A, and green 30A. Always match the replacement rating exactly to prevent wiring damage or malfunction.
Relays within the engine compartment section control high-load switching. Typical relays manage fuel pump activation, starter engagement, and cooling system cycles. These components are larger and removable by hand without tools.
Before inspecting any slot, disconnect the negative battery terminal to avoid short circuits. After replacement, verify operation of the affected system and inspect adjacent slots for heat damage or loose контакts.
Where Each Fuse Box Is Located in Mazda CX30 and How to Open It
Access the cabin electrical unit by pulling off the lower trim panel on the driver side, directly beneath the steering column; use a plastic pry tool to release the clips without cracking the cover, then locate the small latch on the protective крышка and press inward to open it.
The second power distribution assembly sits in the engine compartment near the battery on the left side; release the locking tabs on both sides of the plastic cover and lift it straight up. Inside, you will find high-current links and relays arranged in rows. For safe access, switch off ignition, disconnect the negative terminal, and wait at least one minute before touching internal components. Key access steps include: identifying tab positions, applying even pressure when lifting the cover, and avoiding metal tools that may контакт with terminals.
Some configurations include an additional rear compartment unit located behind side trim in the cargo area; remove the panel by loosening retaining clips, then swing the cover outward. This section usually supports auxiliary circuits such as rear lighting or accessory sockets. Always re-seat each cover firmly after inspection to prevent moisture entry and vibration-related loosening.