How to Jump Start a Acura RLX

1. Turn off power to electric devices such as audio and lights, switch off the engine, then open the hood.
2. Open the fuse box cover on the positive + terminal.
3. Connect the first jumper cable to your vehicle's battery + terminal, then its other end to the booster battery + terminal.
4. Connect the second jumper cable to the booster battery - terminal.
5. Connect the other end of the second cable to the engine hanger as shown, and nowhere else.
6. If using another vehicle, start its engine and raise its rpm slightly, then try starting your engine.
7. Once running, remove cables in order: your ground, booster - terminal, your battery + terminal, booster + terminal.

• Use only a 12-volt booster battery; with a battery charger, select a charging voltage lower than 15-volts.
• If the engine turns over slowly, check that the jumper cables have good metal-to-metal contact.
• After the engine starts, have your vehicle inspected by a nearby service station or a dealer.

Source: 2020 Acura RLX owner's manual, PDF pages 510, 511, 512. 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.