Dodge Grand Caravan Owner's Manual page 483

480 STARTING AND OPERATING
4. Using tire chains on the vehicle.
5. Using wheels/tires not equipped with TPMS sensors.
The EVIC will also display a "SERVICE TPM SYSTEM"
message for a minimum of five seconds when a system
fault possibly related to an incorrect sensor location fault
is present. In this case, the "SERVICE TPM SYSTEM"
message is then followed by a graphic display with
pressure values still shown. This indicates that the pres-
sure values are still being received from the TPM sensors
but they may not be in the correct vehicle position. The
system still needs to be serviced as long as the "SERVICE
TPM SYSTEM" message exists.
Vehicles With Compact Spare
1. The compact spare tire (if equipped) does not have a
TPMS. Therefore, the TPMS will not monitor the pressure
in the compact spare tire.
2. If you install the compact spare tire in place of a road
tire that has a pressure below the low-pressure warning
limit, upon the next ignition switch cycle, the "Tire
Pressure Monitoring Telltale Light" will remain on, the
"LOW TIRE PRESSURE" message will be displayed, a
chime will sound, and the EVIC will still display a
flashing pressure value in the graphic display.
3. After driving the vehicle for up to 20 minutes above
15 mph (24 km/h), the "Tire Pressure Monitoring Telltale
Light" will flash on and off for 75 seconds and then
remain on solid. In addition, the EVIC will display a
"SERVICE TPM SYSTEM" message for a minimum of
five seconds and then display dashes (- -) in place of the
pressure value.