Rear Wheel Speed Sensor
WARNING: This page is about a different car, the 2007 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
A wheel speed sensor is used at each wheel. The front sensors are mounted to the steering knuckles. Front tone wheels are internal to the front bearing. The rear sensors are mounted at the outboard end of the axle. Tone wheels are mounted to the outboard ends of the front and rear axle shafts. The gear type tone wheel serves as the trigger mechanism for each sensor.