Fuses — Description and Replacement (Mazda 3 BK)

Fuses are used to interrupt a circuit when the current exceeds a certain value and to protect components and wires that could be damaged by too much current. A sudden increase in current is usually caused by a fault in the circuit, most often a short circuit. The fuse box is located under the dashboard on the driver's side.

Each fuse protects its own circuit, and its belonging to a particular circuit is indicated on the fuse box cover.



The fuse box contains blade fuses, the color of which corresponds to the fuse protection current. In the event of failure of any element of the electrical equipment, the condition of the fuse should be checked first. The serviceability of the fuse is determined by the presence of a wire conductor connecting the fuse contacts (Fig. 7.2).





To replace a faulty fuse, first turn off the corresponding electrical circuit and remove the fuse from the socket using tweezers (Fig. 7.3).

If a newly installed fuse immediately blows when voltage is applied, check the protected electrical circuit. If the fuse protects several circuits, they must be connected one by one so that the faulty circuit can be determined by the blown fuse.

The heater and air conditioner draw a lot of current, so the fuse box has a switch to protect their circuits. If the circuit is opened by the switch, turn off the heater and air conditioner before pressing the reset button on the switch.