1998 Lexus LS 400 Owners Manual - Page 281

IN CASE OF AN EMERGENCY 2. If required, remove all the 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.) If the booster battery is an extended maintenance interval battery, it is not necessary to remove the vent plugs. 3. If the engine in the vehicle with the booster battery is not running, start it and let it run for about 5 minutes. During jump starting, run the engine at about 2000 rpm with the accelerator pedal lightly depressed. 4. Locate positive (+) and negative (-) terminals of each battery. Connect the jumper cables in the exact order ( 1 2 3 4 ) shown in the illustration. 1 2 3 4 Connect a positive (red) jumper cable clamp to the positive (+) terminal of the discharged battery. Connect the clamp at the other end of the positive (red) cable to the positive (+) terminal of the booster battery. Connect a negative (black) cable clamp to the negative (-) terminal of the booster battery. Connect the clamp at the other end of the negative (black) cable to a solid, stationary, unpainted metallic point (e.g. engine hanger) away from the battery. Do not connect it to or near any part that moves when the engine is cranked. 281