I don't know how it does it.

From the Owners Manual;
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ABLS is a form of traction control using
sensors from the Anti-lock Brake System
(ABS) to transfer power from a slipping drive
wheel to a wheel with more traction. The
ABLS system applies braking to the slipping
wheel, which helps redirect power to another
wheel.

On 4WD models the ABLS system operates
in both 4H and 4LO modes. On 2WD vehicles,
the ABLS system operates on the
drive axle only.

The ABLS system is always ON unless the
system detects brake pad overheating. If
high brake pad temperature is detected, it
will turn OFF, but normal brake function will
continue. ABLS will function even when the
VDC system (if so equipped) is turned OFF.
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