How to Jump Start a Cadillac XTS

1. Make sure the other vehicle has a 12-volt system with a negative ground, and park the two vehicles so they do not touch.
2. Set the parking brake firmly and put an automatic transmission in P (Park).
3. Turn the ignition off and switch off all lights and accessories in both vehicles, except hazard flashers if needed.
4. Connect one end of the red positive (+) cable to the jump start remote positive (+) terminal of the discharged battery.
5. Connect the other end of the red cable to the positive (+) terminal of the good battery.
6. Connect one end of the black negative (–) cable to the negative (–) terminal of the good battery.
7. Connect the other end of the black cable to the remote negative (–) post of the discharged battery.
8. Start the good vehicle and idle it at least four minutes, then try starting the disabled vehicle.

• Remove the cables by reversing the connection sequence exactly, and let the started vehicle idle for several minutes afterward.
• If the vehicle will not start after a few tries, it probably needs service.

Source: 2019 Cadillac XTS owner's manual, PDF pages 309, 310. 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.