Mutual System Control
WARNING: This page is about a different car, the 2008 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
Due to cooperative control with hybrid vehicle control ECU, the skid control ECU controls the hydraulic brake to collect as much electrical energy as possible by making the best use of regenerative brake.
The skid control ECU also improves the stability of the vehicle, performing cooperative control with the power steering ECU to give steering torque assistance, corresponding to driving conditions. (w/ VSC)