Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE
Power System Location Index (Us)
PARTS DESCRIPTION
| 1 | Main fuse (See MAIN FUSE REMOVAL/INSTALLATION (US) .) |
| 2 | Center accessory socket (See CENTER ACCESSORY SOCKET REMOVAL/INSTALLATION .) (See CENTER ACCESSORY SOCKET INSPECTION .) |
| 3 | Fuse block (See FUSE BLOCK REMOVAL/INSTALLATION .) (See FUSE SERVICE CAUTIONS .) |
| 4 | Relay and fuse block (See RELAY AND FUSE BLOCK REMOVAL/INSTALLATION .) (See FUSE SERVICE CAUTIONS .) (See RELAY LOCATION (US) .) (See RELAY INSPECTION .) |
| 5 | Backup power supply (See BACKUP POWER SUPPLY INSPECTION .) |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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