stem, Rear Seat UD5 - Parking Assist, Front & Rear Sensors UE1 - OnStar Communication System UEU - Sensor, Forward Collision Alert EFTA00824259 UFG - Sensor, Rear Cross Traffic Alert UG1 - Homelink Garage Door Opener UHX - Lane Keep Assist/Departure Warning UK3 - Radio Controls -Steering Wheel UKC - S