For Toyota Corolla Altis 2019 2020 Car TPMS Tire Pressure Monitoring Display System Auto Tire Pressure Monitor Security Alarm Please note: Your car must have a tire pressure sensor in order to use our product, otherwise the product cannot be used, thank you For Toyota Corolla Altis 2019-2021. Note: Please make sure it is fit your car before you purchase,if you are not sure,please ,thanks Question:if you don't know weather fit for your car, you can send us photos of your car dasboard photos, we can help you check it. (like below photos show) Entering calibration menu. 1. Leave the car in park mode , start it and select tire presure monitor menu. Stop the car pressing the startop button. Wait 5 seconds and then start the car normally ( press the brake + start button ). Wait until pressure menu is visible , then repeat step 1 3-5 times until instead of seeing tire pressures you see - - - displayed for each wheel. 2. One of the wheel positions will be highlighted in orange. Deflate the wheel until the pressure is read on the display ( tire pressure should be decreased with at least .2 bar ) . Be sure to wait several seconds to see wether the tire pressure is decreased on the display , sensors do not send pressure instantly. If nothing happens , you should deflate the wheel further. If you deflated enough , another wheel will be highlighted . Continue until all wheel pressures are displayed . Enjoy your calibrated display. If the structure of your car's rear row is like the picture below, then the product is installed in the circle on the picture About