2008 Jeep Commander Owner Manual - Page 328

328 STARTING AND OPERATING 10 minutes above 15 mph (24 km/h) will turn OFF the "Tire Pressure Monitoring Telltale Light" as long as none of the road tires are below the low pressure warning threshold. NOTE: If your vehicle is not equipped with a matching full size spare wheel and tire assembly, it does not have a tire pressure monitoring sensor in the spare tire. The TPMS will not be able to monitor the tire pressure. If you install the spare tire in place of a road tire that has a pressure below the low-pressure warning limit, upon the next ignition key cycle, a chime will sound and the "Tire Pressure Monitoring Telltale Light" will turn ON. After driving the vehicle for up to 10 minutes above 15 mph (25 km/h), the "Tire Pressure Monitoring Telltale Light" will flash on and off for 75 seconds and then remain on solid. For each subsequent ignition key cycle, a chime will sound and the "Tire Pressure Monitoring Telltale Light" will flash on and off for 75 seconds and then remain on solid. Once you repair or replace the original road tire, and reinstall it on the vehicle in place of the spare tire, the TPMS will update automatically and the "Tire Pressure Monitoring Telltale Light" will turn OFF, as long as no tire pressure is below the low-pressure warning limit in any of the four active road tires. The vehicle may need to be driven for up to 10 minutes above 15 mph (24 km/h) in order for the TPMS to receive this information. Premium System - If Equipped The Tire Pressure Monitor System (TPMS) uses wireless technology with wheel rim mounted electronic sensors to monitor tire pressure levels. Sensors, mounted to each wheel as part of the valve stem, transmit tire pressure readings to the Receiver Module. NOTE: It is particularly important, for you to check the tire pressure in all of your tires regularly and to maintain the proper pressure.