The R32 version of the Nissan Skyline GT-R had an all wheel drive system called ATTESA-ETS. For the R33 the Vspec had ATTESA ETS Pro which included active lockup of the rear differential, or A-LSD.
This picture is of the light that was added to the dash of this R32 GT-R. In this case, not only did the car have the light, but it also had an actual active differential. Along with the active differential, R34 ABS, and an R34 ATTESA control unit was installed.
|R32 GT-R with A-LSD differential|