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ASR is Accelleration Slip Regulation.
It is the direct opposite of ABS. On ASR, wheel speed sensors monitor drive wheel revs and pulse lock the brake of the spinning wheel so the drive shifts to the opposite wheel. ASR systems will have individual rear wheel sensors.
It is not a limited slip differential type system,where drive power is controlled with clutches in the differential itself.
ABS uses the same sensors , except the controls are reversed where the locked wheel is released to prevent wheel skid when braking.
These both work off the brake system only. The throttle is also regulated when the slip is detected by the ASR module to restrict drive wheel power.

You can tell a chassis w/asr b/c it will have a Yellow ASR triangle indicator lamp on the dash [ center of speedo]. This will light w/key ON position.