Registering new TPMS sensors on most Japanese vehicles requires writing the ID numbers directly to the ECU through the diagnostic port (OBD-learning).

On some Honda vehicles (including Acuras) and Toyotas (incl Lexus & Scion), the TPMS warning light will stay on or blink even after the OBD-relearn has been completed. For some models with highline TPMS, the dash won’t show tire pressures right away, after registering the new sensors.

In those cases, technicians can either test the sensors again using a TPMS tool, or drive the vehicle for a few minutes.
Once the TPMS module hears the newly-registered IDs, the warning light should clear.