DESCRIPTION
The Tire Pressure Monitoring (TPM) system monitors air pressure in the four
road tires (excludes spare). Pressure in the spare tire is not monitored.
There are two tire pressure monitoring systems available, a base system and a
premium system. The base system does not specify how many tires are low or
where they are located. The premium system does so.
The Base TPM system consists of tire pressure monitoring sensors attached to
each road wheel through the valve stem mounting hole, a central receiver module
(WCM) and an indicator lamp.
The Premium TPM system consists of tire pressure monitoring sensors attached
to each road wheel through the valve stem mounting hole, a wireless control
module (WCM) three wheel sensor transponders located in three of the four
wheel wells, an electronic display, and an indicator lamp.
The receiver circuit for the TPM system is integrated into the WCM for non-
remote start vehicles. For factory installed remote start vehicles, the remote start
antenna is external to the WCM. The WCM can also include the Remote Keyless
Entry (RKE) receiver, Remote Start (if equipped), and the Sentry Key
Immobilizer (SKIM) receiver. All four receivers share a number of common
components. The WCM decodes the RF signals transmitted by each of the
vehicle's tire pressure sensors. The decoded information is used to determine if
"warning" or "fault" conditions exist within the TPM system.
Upon detection of a warning or fault condition, the WCM will send a request to
the module that controls the indicator lamp (and the text display if equipped with
the Premium system) via the vehicle bus system to illuminate or flash the
indicator lamp. Also, upon detection of a warning or fault condition, the
electronic display will send a request to sound the "chime".
The WCM will store all warning and fault conditions, placard pressure values
and low-pressure threshold values (lamp ON and OFF) in memory that can be
accessed through diagnostic communication. If new sensors are introduced to the
vehicle, the data stored for the sensor being replaced will be deleted.
The WCM will store all wheel sensor ID's and locations and faults in memory
that can be accessed through diagnostic communication. All other data values
2014 Jeep Patriot Limited
2014 SUSPENSION Tires & Wheels - Service Information - Compass & Patriot
Tuesday, July 19, 2016 10:01:58 AM
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