1998 Lexus GS 400 Owners Manual - Page 324

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.) 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. GS400: security horn tightening bolt, GS300: oil level gauge bracket) away from the battery. Do not connect it to or near any part that moves when the engine is cranked. 40G019 "GS300 5 Discharged battery 6 Booster battery 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. 311