quattro IV EDL

[TM]

To put it most crudely, the current Quattro IV
EDL system is basically traction control- uses the
ABS system to brake a spinning wheel individually.
The "electronic differential lock" is somewhat of
a misnomer, as it would lead you to believe that it
may have computer-controlled diff locks, like the
Porsche 959 and 964C4.

Erik is correct.

Taka