How to Jump Start a Volvo S80

1. Switch off the ignition by setting it to mode 0.
2. Connect the red jumper cable to the auxiliary battery's positive (+) terminal.
3. Fold back the cover over the positive (+) terminal on your vehicle's battery and connect the red cable's other end there.
4. Connect the black cable to the auxiliary battery's negative (–) terminal.
5. Connect the other end of the black cable to the ground point on the right engine mount, at the top, on the outer screw.
6. Start the assisting vehicle's engine, then start the engine of the vehicle with the dead battery.
7. Once running, remove the black negative (–) cable first, then the red positive (+) cable.

• If the auxiliary battery is in another vehicle, make sure the two vehicles are not touching.
• Never use the battery's negative terminal on your vehicle; only the chassis ground point may be used.
• Do not connect a cable to the fuel system or moving parts.

Source: 2016 Volvo S80 owner's manual, PDF pages 239, 333. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.