How to Jump Start a Buick LaCrosse

1. Check that the other vehicle has a 12-volt battery with a negative ground system, and park the two vehicles so they do not touch.
2. Set the parking brake, turn the ignition off, and turn off all lights and accessories in both vehicles, except hazard flashers if needed.
3. Connect one end of the red positive (+) cable to the remote positive (+) terminal on the discharged battery.
4. Connect the other end of the red positive (+) cable to the positive (+) terminal of the good battery.
5. Connect one end of the black negative (–) cable to the negative (–) terminal of the good battery.
6. Connect the other end of the black negative (–) cable to the remote negative (–) ground terminal for the discharged battery.
7. Start the engine of the vehicle with the good battery and let it idle for at least four minutes.
8. Try to start the vehicle with the dead battery; if it will not start after a few tries, it probably needs service.

• The remote terminals for the discharged battery are on the driver side; the positive connection is under a cover that must be removed.
• Remove the cables by reversing the connection sequence exactly, then let the started vehicle idle for several minutes.
• Connecting or removing the cables in the wrong order can cause electrical shorting and damage.

Source: 2019 Buick LaCrosse owner's manual, PDF pages 305, 306. 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.