It's actually called Tire Fill Alert in the 1500 owners manual: Don't understand the change in terminology
Tire Fill Alert
This feature notifies the user when the placard tire pressure is attained while inflating or deflating the tire. The customer may choose to disable or enable the Tire Fill Alert feature through use of the customer settings in the radio.
NOTE:
• Only one tire can be filled at a time when using the Tire Fill Alert system.
• The Tire Fill Alert feature cannot be entered if an existing TPM system fault is set to “active” or if the system is in deactivation mode (if equipped).
The system will be activated when there is over 1.5 psi (10 kPa) of change in tire pressure.
The ignition must be in the RUN mode, with the transmission in PARK (P).
NOTE: It is not required to have the engine running to enter Tire Fill Alert mode.
The hazard lamps will come on to confirm the vehicle is in
Tire Fill Alert mode.
When Tire Fill Alert Mode is entered, the tire pressure display screen will be displayed in the instrument cluster.
Operation:
• The horn will chirp to let the user know when to stop filling the tire, when it reaches recommended pressure.