How to Jump Start a Acura RLX Sport Hybrid

1. Turn off audio, lights and other electric devices, switch off the power system, then open the hood.
2. Open the fuse box cover on your vehicle's 12-volt battery positive + terminal.
3. Clamp the first jumper cable to your vehicle's 12-volt battery + terminal and the other end to the booster battery + terminal.
4. Clamp the second jumper cable to the booster battery - terminal.
5. Attach the other end of the second cable to the engine hanger, and nowhere else.
6. Start the assisting vehicle's engine and raise its rpm slightly, then try starting your engine.
7. After starting, remove the cables in reverse: your ground first, booster - terminal, your battery + terminal, then booster + terminal.

• Use only a 12-volt booster battery; a battery charger should be set below 15 volts.
• If the engine turns over slowly, check that the cables make good metal-to-metal contact.
• Have the vehicle inspected by a service station or dealer after the engine starts.

Source: 2020 Acura RLX Sport Hybrid owner's manual, PDF pages 564, 565, 566. 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.