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Toyota 2006 Prior: Older TPMS systems are passive types and aren't really a sensor but the ABS ecu measures the difference in wheel speed between an axle and thats how it knows when is at a different PSI than the other which is why for some systems the cars learn them on their own however not as great because if tires lose pressure at the same pace you can have them 10PSI low and the system still says they are even. Normally this system has a reset or re-initialize button.
2007+: Note some will have a re-initialize button and some may even have a button for a second set of tires and sensors. Newer systems as used in most vehicles since 2007 when Federal said they wanted sensors in the wheel that actively convey information is the way to go and they do broadcast signals every 30-60 seconds and the ABS or TPMS ECU pick up the signal and require the sensors be registered to the ecu itself. So even if your in a parking lot next to another Toyota it wont even accept the information other then from the registered sensors.
Not sure how helpful that is but if I get a chance at work tomorrow ill do some research and see if in fact the system has different parameters for the FRS or not.
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