Sensor-Rear Wheel Speed: Description
WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
One wheel speed sensor (3) is mounted to the rear of each rear knuckle. The wheel speed sensor, using a tone wheel attached to the rear axle half shaft as a trigger mechanism, communicates with the Antilock Brake Module, informing it of that wheel's speed.