1999 Lexus SC 400 Owners Manual - Page 297

IN CASE OF AN EMERGENCY JUMP STARTING PROCEDURE 1. If the booster battery is installed in another vehicle, make sure the vehicles are not touching. Turn off all unnecessary lights and accessories. 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.) 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. Connect the jumper cables in the exact order shown in the illustration: positive terminal ("+" mark)-to-positive terminal ("+" mark), and negative terminal ("-" mark)-to-engine or body ground. Note that you first connect the positive cable to the discharged battery and then to the booster battery. Next, connect the negative cable to the booster battery and then to a solid, stationary, unpainted metallic point (e.g. SC400: brake booster vacuum pipe bracket, SC300: cylinder head) away from the battery. Do not connect it to or near any part that moves when the engine is cranked. CAUTION When making the connections, to avoid serious injury, do not lean over the battery or accidentally let the jumper cables or clamps touch anything except the correct battery terminals or the ground. 279