2007 Chrysler Aspen Owner's Manual - Page 264

264 STARTING AND OPERATING When additional traction is required, the transfer case 4WD LOCK position can be used to lock the front and rear driveshafts together and force the front and rear wheels to rotate at the same speed. This is accomplished by rotating the 4WD Control Switch to the 4WD LOCK position - see Shifting Procedure section for specific shifting instructions. The 4WD LOCK position is designed for loose, slippery road surfaces only. Driving in the 4WD LOCK position on dry hard surfaced roads may cause increased tire wear and damage to the driveline components. Transfer Case Position Indicator Lights Transfer case position indicator lights are located on the instrument cluster, and indicate the current and desired transfer case selection. If there are no indicator lights on or flashing the transfer case position is Four-Wheel Drive (4WD). The "SVC 4WD" warning light monitors the electric shift 4WD system. If this light remains on after engine start up or illuminates during driving, it means that the 4WD system is not functioning properly and that service is required. WARNING! Always engage the parking brake when powering down the vehicle if the Service 4WD light is illuminated. Not engaging the parking brake may allow the vehicle to roll which may cause personal injury. NOTE: Do not attempt to make a shift while only the front or rear wheels are spinning. The NV 144 transfer case is not equipped with a synchronizer and therefore the front and rear driveshaft speeds must be equal for the