Trailer Sway Control

Trailer sway control is a unique function of the RSC®  system that uses information from the steering wheel rotation sensor and the yaw information from the RCM  to determine if a trailer sway event is taking place. Trailer sway is the undesirable yaw force a trailer can apply to the towing vehicle. If the ABS module determines that trailer sway event is taking place, the ABS module modulates brake pressure to the appropriate brake caliper(s) by opening and closing the appropriate solenoid valves inside the HCU  while the hydraulic pump motor is activated. At the same time, the ABS module sends a message over the HS-CAN  bus that a trailer sway event is taking place. When the IC  receives this message, it flashes the sliding-car icon and display TRAILER SWAY, REDUCE SPEED in the message center. If the event is severe enough, the ABS module sends a message to the PCM over the HS-CAN  bus to assist with vehicle stability. When the PCM receives this message, it adjusts engine timing and decrease fuel injector pulses. Once the trailer sway has been corrected, the ABS module returns the solenoid valves in the HCU  to their normal position, deactivates the hydraulic pump motor and sends another message over the HS-CAN  bus indicating that the event has ended. The PCM returns engine timing and fuel injectors to normal operation and the IC  extinguishes the sliding-car icon.

The trailer sway control system activates when the vehicle speed exceeds 64 km/h (40 mph). The system can be disabled during any key cycle. Refer to the Owner's Literature for information on disabling the system. The system is re-enabled when the ignition cycled from RUN to OFF and back to RUN.