2007 Mercedes GL-Class Owner's Manual - Page 209
2007 Mercedes GL-Class Manual
Page 209 highlights
Controls in detail Differential locks* AUTO mode The AUTO mode is adequate for most driving situations since the center differential is locked and released as required. Center and rear axle differential locks Warning! The differential locks should only be engaged manually if traction is insufficient in AUTO mode. The differential locks can be engaged in the sequence 3, 4 ( page 207) up to a speed of 19 mph (30 km/h). Engaging differential locks: for off-road driving for driving through water when driving on deep snow and icy or fouled surfaces G i At speeds up to 19 mph (30 km/h), it is possible to manually lock the differential locks for driving on rough terrain. Start the engine ( page 42). The center differential locks is in AUTO mode. The indicator lamp on the adjustment ring 1 above symbol U 2 is on. Never drive on a paved surface with the center and rear axle differential locks manually engaged. Ability to steer the vehicle is greatly reduced when the differential locks are manually engaged, increasing the risk of an accident. For safety reasons, the locks are automatically released at a vehicle speed above 31 mph (50 km/h). Nevertheless, you should only manually lock the differential if absolutely necessary because engaged locks will restrict the vehicle drive train while cornering and cause the vehicle to chatter. This could cause you to lose control of the vehicle and cause an accident. ! The differential locks must not be engaged manually when towing the vehicle or spinning the wheels. 208