2003 Mercedes SL-Class Owner's Manual - Page 320

Practical hints Batteries Disconnecting the battery for electrical consumers Unhook the luggage cover in the trunk. Remove the trunk floor. The battery for electrical consumers is located in the right hand area of the trunk ( page 289). Use the 10 mm open-end wrench from the vehicle tool kit to disconnect the battery negative lead. Remove the cover from the positive terminal. Disconnect the battery positive lead. Disconnecting the starter battery Use the 10 mm open-end wrench from the vehicle tool kit to disconnect the battery negative lead. Remove the cover from the positive terminal. Disconnect the battery positive lead. Warning! G Warning! With a disconnected battery G The brake system requires electrical power to operate. A malfunction in the vehicle's power supply or electrical system may impair brake system operation and switch it into its limp-home (emergency operation) mode. The same applies if battery is disconnected. To brake, the driver must then apply significantly greater brake pedal pressure and depress the pedal much further to obtain the expected braking effect. If necessary, apply full pressure to the brake pedal. Brakes are only applied to the front wheels. Stopping distance is increased! Adjust your driving style accordingly. SBC brake system ( page 72). you will no longer be able to turn the key in the starter switch and pressing the KEYLESS-GO* start/stop button (if so equipped) on the selector lever will have no effect the selector lever will remain locked in position P Disconnecting the batteries ! To avoid damage to electrical components, always disconnect the battery for electrical consumers (in trunk) first. This applies even if you only wish to charge the starter battery. Otherwise the electronics of the vehicle can be damaged. 320