The system is activated automatically when the vehicle is moving at speeds from 40 to 80 km/h.
The operation of the ETS is monitored simultaneously with the state of the anti-skid system (ESP) - the driver is warned of a dangerous decrease in the coefficient of adhesion of the tires to the road surface by activation of the lamp in the flashing special indicator lamp 4-ETS/ESP (see Section Instrument cluster, gauges and control lamps and indicator lights).
If a fault is detected in the traction control system, the 4-ETS indicator lamp is activated (see Section Instrument cluster, gauges and control lamps and indicator lights).
When LOW RANGE mode is activated for off-road driving, the 4-ETS system is put into a special operating mode that provides increased reliability of traction control.
Maximum efficiency of ASR in winter is achieved by using M+S class tires (for driving on mud and snow).
Attention! Using tires of different sizes on the drive axle leads to a noticeable decrease in the effectiveness of the anti-slip system!
Note: When the brakes are under high load, the 4-ETS system is automatically switched off briefly to prevent the brakes from overheating. This switching off is accompanied by the activation of the indicator lamp.
If the anti-lock braking system (ABS) fails, the traction control system is also disabled.
Original source of information: mercedesman.ru