2009 Mercedes CLS-Class Owner's Manual - Page 327

Practical hints Jump starting ! Jump starting should only be performed using the jump-start terminals located in the engine compartment. Avoid repeated and lengthy starting attempts. Do not attempt to start the engine using a battery quick-charge unit. If the engine does not run after several unsuccessful starting attempts, have it checked at the nearest authorized Mercedes-Benz Center. Excessive unburned fuel generated by repeated failed starting attempts may damage the catalytic converter and may present a fire risk. Make sure the jumper cables do not have loose or missing insulation. Make sure the cable clamps do not touch any other metal part while the other end is still attached to a battery. If the battery is discharged, the engine can be started with jumper cables and the battery of another vehicle. Observe the following: RJump starting should only be performed when the engine and catalytic converter are cold. RDo not start the engine if the battery is frozen. Let the battery thaw out first. ROnly jump start from batteries with the same voltage rating (12 V). Jump starting with a more powerful battery could damage the vehicle's electrical system, which will not be covered by the Mercedes-Benz Limited Warranty. use jumper cables with sufficient cross-section and insulated terminal clamps. make sure the jumper cables are not on or near pulleys, fans or other parts that move when an engine is started or running. 1 Positive terminal of discharged battery 2 Negative terminal of discharged battery 3 Positive terminal of charged battery 4 Negative terminal of charged battery ROnly RAlways G Warning! Keep flames or sparks away from battery. Do not smoke. Observe all safety instructions and precautions when handling automotive batteries. The battery is located in the trunk underneath the luggage box (Y page 254). X Make sure the two vehicles do not touch. X X X X ! Never invert the terminal connections! X Connect positive terminals 1 and 3 of the batteries with a jumper cable. Clamp the cable to positive terminal 3 of the charged battery first. Start engine of the vehicle with the charged battery and run at idle speed. Connect negative terminals 2 and 4 of the batteries with a jumper cable. Clamp the cable to negative terminal 4 of the charged battery first. X X Turn off all electrical consumers. Apply the parking brake. Make sure the automatic transmission is in park position P. Open the trunk. Z 325