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Because the one below is the reset switch. The satellite control you're talking about merely toggles between two different sets of TPMS
I guess they changed it for MY '08, because on my 07, the first "page" says "INITIAL" to initialize the monitors, then the next page is to toggle between the MAIN set of tires and the 2ND set. So, if the OP needs to reset, he should use the button next to the steering wheel--there is no button under the dash.
There's still an actual TPMS button bellow the dash on the IS, similar to the one of the GS posted above. These satellite controls allow you to toggle between two different sets of wheels with TPMS programmed
i have tried most of the suggestions written here but the thing won't go off
Tex is right, it may just be a faulty sensor in this case if the light won't go off.
finally the pressure sensor light is gone. took the car to a technician to wipe off the signal and he discovered the the sensor were not transmitting information to the system, the guy could not fix it but wipe off the warning light but before i got home the warning light came back up. at of frustration this mrning i decided to find the solution on my own, i click the setting button on the dash board and recalibrated the tyres, there after i use the satellite switch to navigate to initiallize the tyre, i held the button down till i heard a beep sound i put off the engine of the car, turn it to ignition mode repeated the initialization again and to my amazement the warning light went off. Yehaaaa