TPMS Function

NOTE: When directed to train any TPMS sensors, use only the sensor training procedure outlined in this service information. Do not use the TPMS reset procedure outlined in the Owner's Literature as this procedure does not program new sensors to the module.

The TPMS uses 4 valve stem mounted sensors to monitor tire pressure. These sensors transmit tire pressure data to the RTM . Each individual sensor contains its own battery and transmits tire pressure data to the RTM . The RTM is a radio receiver that collects the tire pressure data and sends the information along the MS-CAN to the GWM which then sends the information to the BCM along the HS-CAN . All TPMS functions are controlled by the BCM . The TPMS sensors are trained (calibrated) to the BCM , which records the unique identifier for each sensor. The BCM records the location of each TPMS sensor based on the training (calibration) order and compares the tire pressure data sent by the sensors with a programmed tire pressure. This programmed pressure is specified on the VC label. If the tire pressure deviates from the programmed tire pressure the BCM , using the MS-CAN , signals the IPC to illuminate the TPMS warning indicator and display a message in the message center. The programmed tire pressure cannot be changed.

The diagnostic scan tool is useful in diagnosing TPMS concerns and may be used to verify the accuracy of the tire pressure data transmitted by the TPMS sensors. This is accomplished by comparing the BCM tire pressure PID data to the actual tire pressure using a digital tire pressure gauge.

It is not necessary to train the sensors after a tire rotation on vehicles with the same front and rear tire pressures however, the BCM cannot recognize the sensor identifiers have been moved to different positions and retains the original position information for each sensor.