2004 Mercedes SL-Class Owner's Manual - Page 201

Controls in detail Driving systems Distronic activated When Distronic is activated the DTR symbol and the set speed are seen in the left display. Cruise control lever The Distronic system is operated by means of the cruise control lever. The cruise control lever is the uppermost lever found on the left-hand side of the steering column. Activating Distronic You can activate Distronic if you are driving between 25 mph (40 km/h) and 110 mph (180 km/h) the ESP is activated ( page 78) When Distronic is activated the speedometer display will show a message such as DTR 60 mph. 1 Symbol for activated Distronic 2 Set speed If Distronic is deactivated, the speedometer display will show the message DTR --- mph. In the following cases you cannot activate Distronic: 1 Set current or higher speed 2 Set current or lower speed 3 Deactivate Distronic 4 Resume at last set speed up to two minutes after starting the engine when you brake if you have set the parking brake if the gear selector lever is in position P, R, or N. if the ESP is switched off 200