Durango 2WD V8-5.7L (2008)
Tire Pressure Monitor Receiver / Transponder: Description and Operation
Operation - Premium System
OPERATION - PREMIUM SYSTEM
On vehicles equipped with the premium TPM system, the Wireless Control Module (WCM), commonly referred to as the Sentry Key Remote Entry
Module (SKREEM), uses transponders (trigger modules) located in three of the four wheel wells on the vehicle to provide it with the location of the tire
pressure sensors on the vehicle. Like the base system, the WCM receives RF signals from all four rotating wheel speed sensors. When the WCM needs to
know which sensor is located at a particular location on the vehicle, it directs the transponder at that location to send out a low frequency signal to excite
the nearby sensor. The WCM then receives that excited signal and knows where that sensor is located. This auto-locating process only happens in the
first 10 minutes of any WCM cycle while traveling at speeds above 20 mph (32 km/h) (Each WCM cycle ends when the vehicle has been shut off for a
time period of approximately 15 minutes or longer). Once the WCM has performed this to the three locations that have transponders (left front, right
front, and left rear wheel wells), it uses the process-of-elimination theory to know that the fourth sensor ID signal is coming from the left rear tire sensor.
