Change a Blown Fuse

A dead 12 V socket, a silent radio or a single dark light is often just a blown fuse. The Yaris has two fuse boxes — one in the engine bay and one inside the cabin. Here is how to find the right box, read your own car’s legend, and swap a fuse safely.

Find and change a Yaris fuse

1. Choose the box. The engine-bay fuse and relay box (right side of the bay, under a clip-off lid) carries the high-current and under-bonnet circuits. The cabin fuse box, behind a cover at the lower dash or kick panel, holds most interior circuits.
2. With everything switched off, unclip the lid. The inside of the lid (and your owner’s handbook) carries the legend that maps each fuse to its circuit — always read your car’s legend, because assignments vary by engine, trim and market.
3. Pull the suspect fuse straight out using the plastic puller clipped inside the box — never metal pliers.
4. Hold it to the light: a broken or darkened metal strip means it has blown.
5. Fit a replacement of the same amperage only (printed on the fuse and in the legend). A higher rating is never a fix — it removes the protection your wiring relies on.
6. Push the new fuse fully home and refit the lid.
7. If the new fuse blows again, stop. That circuit has a short and needs diagnosing, not another fuse.

The red flip-up cover in the engine-bay box is the +B jump-start terminal, not a fuse — leave it closed unless you are boosting a flat battery.

Frequently asked questions

Which fuse is the 12 V socket / cigarette lighter?

It sits in the cabin fuse box. Read the lid legend for a “POWER OUTLET”, “ACC” or socket symbol rather than guessing — the position differs between trims.

My Yaris has no power at all — is it a fuse?

A complete no-power is more often the 12 V battery (in the boot) than one fuse. Check the battery first, then the main fuses in the engine-bay box.

Can I fit a higher-amp fuse so it stops blowing?

Never. The rating is sized to protect the wiring; a bigger fuse lets the circuit overheat and can start a fire. Fix the cause instead.

If a warning light appears alongside the failed circuit, you can check the fault code on autodtcs.com.