For the 2009 model year, Jeep made its first real changes to the JK series by adding several new safety features as well as some cosmetic upgrades. First, the company put in Hill Start Assist (HSA) to help prevent rollback on graded surfaces, and then incorporated Trailer Sway Control (TSC) that monitored vehicle movement while towing, relative to its intended path. If the Wrangler began to sway outside set parameters, its computer would activate the Electronic Stability Program (ESP). A new center dome lamp with directional lighting, drop in center console bin, and cargo nets for additional storage rounded out interior changes.