2012 Jeep Grand Cherokee Owner Manual - Page 511

STARTING AND OPERATING 509 The EVIC will also display a ЉSERVICE TPM SYSTEMЉ message for a minimum of five seconds when a system fault is detected possibly related to an incorrect sensor location fault. In this case, the ЉSERVICE TPM SYSTEMЉ message is then followed by a graphic display, with pressure values still shown. This indicates the pressure values are still being received from the TPM Sensors but they may not be located in the correct vehicle position. 1. Jamming due to electronic devices or driving next to However, the system still needs to be serviced as long as facilities emitting the same Radio Frequencies as the TPM the ЉSERVICE TPM SYSTEMЉ message exists. sensors. NOTE: There is no tire pressure monitoring sensor in 2. Installing some form of aftermarket window tinting the spare tire. The TPMS will not be able to monitor the that affects radio wave signals. tire pressure. If you install the spare tire in place of a road 3. Lots of snow or ice around the wheels or wheel tire that has a pressure below the low-pressure warning housings. limit, upon the next ignition switch cycle, the Tire Pressure Monitoring Telltale Light will remain ON, a chime 4. Using tire chains on the vehicle. will sound, and the EVIC will still display a "flashing" 5. Using wheels/tires not equipped with TPM sensors. pressure value in the graphic display. After driving the vehicle for up to 20 minutes above 15 mph (24 km/h), the If the ignition switch is cycled, this sequence will repeat, providing the system fault still exists. If the system fault no longer exists, the Tire Pressure Monitoring Telltale Light will no longer flash, the ЉSERVICE TPM SYSTEMЉ message will not be present, and a pressure value will be displayed instead of dashes. A system fault can occur by any of the following: 5