ABS With Traction Control, Electronic Stability Control (ESC) and Roll Stability Control (RSC®): Notes

The ABS with traction control, Electronic Stability Control (ESC) and Roll Stability Control (RSC®) consists of the following components:

• ABS module - attached to the Hydraulic Control Unit (HCU), but can be serviced separately.
• Active brake booster - located in the engine compartment on the LH side of the vehicle. Similar to a standard vacuum brake booster but with additional sensors and a solenoid. For removal and installation of the active brake booster, refer to HYDRAULIC BRAKE ACTUATION article.
• Front wheel speed sensors - one sensor is located in each front wheel knuckle. The sensors are serviced separately from the knuckle.
• Front wheel speed sensor tone rings - one tone ring is located in each wheel bearing and wheel hub assembly and is serviced with the wheel bearing and wheel hub. Refer to Wheel Bearing and Wheel Hub in FRONT SUSPENSION - REAR WHEEL DRIVE (RWD) article or FRONT SUSPENSION - FOUR WHEEL DRIVE (4WD) article.
• HCU - which contains several valves (inlet, outlet, isolation and dump), the hydraulic pump motor and is mounted behind the battery and battery tray.
• Rear wheel speed sensors - one sensor is located in each rear wheel knuckle, the sensors are serviced separately from the knuckle.
• Rear wheel speed sensor tone rings - one tone ring is located in each wheel bearing and wheel hub assembly and is serviced with the wheel bearing and wheel hub. Refer to Wheel Bearing and Wheel Hub in REAR SUSPENSION article.
• Stability control sensor cluster - located under the center portion of the instrument panel and contains several sensors (yaw rate, roll rate, lateral accelerometer and longitudinal accelerometer).
• Steering wheel rotation sensor - located at the end of the steering column on the LH side of the column, the slotted wheel is serviced with the steering column.
• Stability/traction control switch - part of the power liftgate/traction control/hazard center stack switch assembly located in the instrument panel finish panel. The switch assembly is serviced separately from the finish panel.