Jump-Start a Dead 12V Battery

A flat 12-volt battery is the most common reason a Toyota Yaris XP130 won’t start. With jumper cables and a running car you can be moving again in ten minutes — as long as you connect the clamps in the right order and to the right points.

Where to connect on the Yaris

The 12-volt battery sits in the engine bay on the petrol Yaris. Connect the positive clamp to the battery’s “+” terminal (some trims have a dedicated red-capped “+” jump post next to it). For the negative, do not clamp to the battery’s “−” terminal — use a solid, unpainted metal point on the engine away from the battery, as the manual specifies. This keeps any spark away from battery gases.

What you’ll need

• A set of jumper (booster) cables in good condition.
• A second vehicle with a charged 12-volt battery (never a truck running at 24 volts).
• Both cars in park/neutral, ignitions off, handbrakes on, not touching each other.

Jump-start the Yaris step by step

1. Open the hood and find the 12 V battery (or the red “+” jump post).
2. Clamp one end of the positive (red) cable to the “+” terminal on your Yaris.
3. Clamp the other end of the positive cable to the “+” terminal on the donor car.
4. Clamp the negative (black) cable to the “−” terminal on the donor car.
5. Clamp the other end of the negative cable to a solid, unpainted metal bracket on your Yaris’s engine — away from the battery and any moving parts.
6. Start the donor car and hold a slightly raised idle for about five minutes to feed charge into your battery.
7. Keyless cars: open and close a door with the engine switch off so the car wakes up. Then switch the ignition to ON (or IGNITION ON) and start your Yaris.
8. Once it runs, remove the cables in the exact reverse order: your engine ground, donor “−”, donor “+”, your “+”.

Drive for at least 20–30 minutes, or put the battery on a charger, so it recovers a usable charge.

After a jump-start

• The Stop & Start system may show “A OFF” and not cut the engine for 5–60 minutes while the battery management re-samples the battery — this is normal.
• If the car dies again as soon as you stop, the battery or alternator needs testing. A battery that needs a jump twice in a week is at the end of its life.
• Replace a worn battery with the same case size and an equal-or-higher Ah and CCA rating; Stop & Start cars need an EFB-type battery.

Frequently asked questions

Can I push-start a manual Yaris instead?
No. Toyota warns against push- or tow-starting because unburnt fuel can overheat and damage the three-way catalytic converter. Multidrive (CVT) cars cannot be push-started at all.

Can I jump-start the hybrid Yaris the same way?
Yes, but the 12 V auxiliary battery is in the boot. Use the dedicated “+” jump post under the hood (red cover) and an engine ground point — never the high-voltage system. The procedure is otherwise identical.

Why connect the negative to the engine, not the battery?
A charging battery gives off hydrogen. Making the final connection away from the battery keeps the small spark that forms away from that gas, which greatly reduces the risk of a battery explosion.

Nothing happens even with cables on — now what?
Check the clamps are biting clean metal and the donor car is running. If the Yaris still shows no dash lights, the battery may be completely dead or a main fuse has blown; see the fuse guide.

If a warning light stays on after starting, decode it at autodtcs.com.