Circuit/System Description
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
The wheel speeds are detected by active wheel speed sensors and encoder rings. The encoder ring consists of permanent magnets. Each wheel speed sensor receives ignition voltage through the signal circuit from the electronic brake control module. As the wheel spins, the wheel speed sensor produces square wave signal on the signal circuit to the electronic brake control module. The electronic brake control module uses the frequency of the square wave signal to calculate the actual wheel speed.