2007 Lexus GS 450h Owners Manual - Page 491

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 12 volt battery is discharged. You can call your Lexus dealer, Roadside Assistance or Lexus Customer Service. 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 Open the trunk using the mechanical key. (→P. 474) 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. Negative (-) battery terminal on your vehicle. STEP 3 Start the engine of the second vehicle. Increase the engine speed slightly and maintain at that level for approximately 5 minutes to recharge the 12 volt battery of your vehicle. STEP 4 Open and close any of the doors with the power switch "OFF". 476