RAM 2500 2020 Owner's Manual page 173

Operation:
The horn will chirp once when the selected

pressure is reached to let the user know
when to stop inflating or deflating the tire.
The horn will chirp three times if the tire is

over inflated or over deflated and will
continue to chirp every five seconds if the
user continues to inflate or deflate the tire.
The horn will chirp once again when enough

air is added or removed to reach proper
selected pressure level.
Tire Pressure Information System (TPIS)
3500 Series Trucks
Your vehicle may be equipped with a Tire
Pressure Information System (TPIS).
The Tire Pressure Information System (TPIS)
uses wireless technology with wheel rim
mounted electronic sensors to transmit 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 the tires on your vehicle
monthly and to maintain the proper pressure.
The TPIS consists of the following components:
Receiver module

Four TPM sensors (Single Rear Wheel (SRW)

applications)
Six TPM sensors (Dual Rear Wheel (DRW)

applications)
Pressure display in the instrument cluster

The TPIS system will display all four (Single Rear
Wheel (SRW) applications) or six (Dual Rear
Wheel (DRW) applications) tire pressure values
in the instrument cluster display.
If a system fault is detected, the instrument
cluster will display a "SERVICE TPM SYSTEM"
message for a minimum of five seconds and
then display dashes (- -) in place of the pressure
value to indicate which sensor is not being
received.
If the ignition switch is cycled, this sequence will
repeat, providing the system fault still exists. If
the system fault no longer exists, the "SERVICE
TPM SYSTEM" message will no longer be
displayed, and a pressure value will display in
place of the dashes. A system fault can occur
due to any of the following:
Signal interference due to electronic devices

or driving next to facilities emitting the same
radio frequencies as the TPM sensors.
Installing aftermarket window tinting that

contains materials that may block radio wave
signals.
Accumulation of snow or ice around the

wheels or wheel housings.
Using tire chains on the vehicle.

Using wheels/tires not equipped with TPM

sensors.
SAFETY 171
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