Wheel Speed Sensors and Rings
WARNING: This page is about a different car, the 2008 Suzuki Swift +, 2008 Pontiac Wave, and 2008 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
A wheel speed sensor is present at each wheel. The sensors transmit wheel speed information to the electronic brake control module (EBCM) by means of a small alternating current (AC) voltage. The signal is transmitted to the EBCM through interface that can cause false or noisy wheel speed sensor input to the EBCM.