ESP, function: EDL:

The electronic differential lock (EDL) is an aid when driving away from a standstill. An electronically controlled brake application on the spinning driven wheel provides a torque reaction point for the differential. This enables the wheel with better traction to make use of the engine power. The EDL is effective in both forward and reverse directions.

On vehicles with all wheel drive, EDL acts on all four wheels; a mechanical differential lock is not required.

In conjunction with ESP, the EDL is active at all speeds.