Interesting. That is not what i am seeing. That is not what is in my owners manual or diesel supplement. I do have the low tire light do a functionality test along with other warning lights on startup. Why have a non functioning lamp test itself. Also, i know we talk about the 3500 having a TPIS but nowhere in my owners manual is that acronym described or talked about. I believe a 3500 will throw a tire light when it gets very low. It just does not care what your pressures are until it gets dangerous. I may need to just air down to 20 in the front and go for a ride.
you might want to look in the owners manual and not the Diesel supplement....from the owners manual:
"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.
"