2003 Mercedes C-Class Owner's Manual - Page 310

Practical hints Towing the vehicle ! When towing the vehicle with all wheels on the ground, please note the following: With the automatic central locking activated and the key in starter switch position 2, the vehicle doors lock if the left front wheel as well as the right rear wheel are turning at vehicle speeds of approx. 9 mph (15 km/h) or more. Switch off the tow-away alarm ( page 80). To prevent the vehicle doors from locking, deactivate the automatic central locking ( page 129). Towing of the vehicle should only be done using the properly installed towing eye bolt. Never attach tow cable, tow rope or tow rod to vehicle chassis, frame or suspension parts. Warning! G i If the battery is disconnected or discharged the key will not turn in the starter switch. See notes on the battery ( page 240) or on jump starting ( page 306). the selector lever will remain locked in position P. See notes on manual unlocking of gear selector lever ( page 288). With the engine not running, there is no power assistance for the braking and steering systems. In this case, it is important to keep in mind that a considerably higher degree of effort is necessary to brake and steer the vehicle. Adapt your driving accordingly. 310