How to Jump Start a Volvo V90

1. Put the ignition in mode 0 and check that the auxiliary battery is 12 volts.
2. If the helper battery is in another vehicle, switch that engine off and keep the vehicles from touching.
3. Clamp the red cable to the auxiliary battery's positive (+) terminal (1), then fold back the cover on your positive (+) jump start terminal (2).
4. Clamp the other end of the red cable to your vehicle's positive (+) jump start terminal (2).
5. Clamp the black cable to the auxiliary battery's negative (-) terminal (3), then the other end to your negative (-) ground point (4).
6. Check that the clamps are secure, then run the assisting vehicle's engine at about 1500 rpm for a few minutes.
7. Start the engine of the vehicle with the dead battery.
8. Remove the cables in reverse order, black cables first and then red cables.

• Do not touch the connections between cable and vehicle during the start attempt because of sparking risk.
• Keep black clamps away from the positive jump start terminals and the red cable clamps.
• Do not connect the cable to the fuel system or moving parts.

Source: 2019 Volvo V90 owner's manual, PDF pages 453, 454. 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.