Sensor, Wheel Speed, Front: Description
WARNING: This page is about a different car, the 2020 Chrysler 300 and 2019 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
 Courtesy of CHRYSLER GROUP, LLC
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One Wheel Speed Sensor (WSS) is mounted to each knuckle. The WSS, using a tone wheel and bearing as a trigger mechanism, communicates with the Anti-lock Brake Module (ABM), informing it of that wheel's speed.
The head of the front WSS mounts to the inside of the knuckle.