2008 Lexus RX 400h Owners Manual - Page 416

5-2. Steps to take in an emergency If the 12-volt battery is discharged The following procedures may be used to start the hybrid system if the vehicle's battery is discharged. You can call your Lexus dealer, or qualified repair shop. If you have a set of jumper (or booster) cables and a second vehicle with a 12-volt battery, you can jump start your Lexus following the steps below. STEP 1 STEP 2 Remove the engine compartment cover. (→P. 317) Connecting the jumper cables. If required, remove all vent plugs from the booster battery. Lay a cloth over the open vents on the booster battery. (This helps reduce the explosion hazard, personal injuries and burns.) Positive (+) battery terminal on your vehicle Positive (+) battery terminal on the second vehicle Negative (-) battery terminal on the second vehicle Connect the jumper cable to ground on your vehicle as shown in the illustration. STEP 3 Start the hybrid system of the second vehicle. Increase the gasoline engine speed slightly and maintain at that level for approximately 5 minutes to recharge the battery of your vehicle. STEP 4 Maintain the gasoline engine speed on the second vehicle and start the vehicle's hybrid system. 5 When trouble arises 421