VIDEO: Tech Tip: How to fix the ECU lock and closed loop issue on a Toyota vehicle

In this video, ATEQ shows how some Toyota models have a “set” or “TPMS reset” button, which is located below the steering wheel or under the glovebox. When the button is pressed, the system tries to locate the sensor ID’s that are already stored. The “set button” can be used when performing a tire rotation that has different tire pressures in the front and rear, changing or adjusting the tire pressure, or changing tire size, or when tires are replaced. If the “set” button is pushed after new sensor IDs are introduced and before a relearn is performed, the ECU must be unlocked in order for the relearn procedure to work correctly. Some advanced TPMS scan tools have the capability to unlock the ECU. If your TPMS scan tool has the “unlock ECU” option, the relearn procedure can be properly performed. 

Information provided by ATEQ TPMS Tools