Rav4's have a very sensitive TPMS ecu. Did the light flash before going solid? If did you are having a problem with the sensors being read either from a bad sensor or ecu. You didn't use fix a flat did you? Also the gauge you are using could be defective. Take the car to a dealer or any shop and have them fill up the tires. If it doesn't go out bring it to the dealer. I haven't seen a reset switch on any rav4 and the spare is almost always the cluprit. But since you said you checked all 5 id assume you are good to go.
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