Car TPMS Tire Preure Monitoring Display System Monitor Security Alarm For Toyota Corolla Altis 2019 2020 2021 2022 2023 Please note: Your original car must have a tire preure 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 contact us,thanksQuestion: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 preing the startop button. Wait 5 seconds and then start the car normally ( pre the brake + start button ). Wait until preure menu is visible , then repeat step 1 3-5 times until instead of seeing tire preures you see - - - displayed for each wheel. 2. One of the wheel positions will be highlighted in orange. Deflate the wheel until the preure is read on the display ( tire preure should be decreased with at least .2 bar ) . Be sure to wait several seconds to see wether the tire preure is decreased on the display , sensors do not send preure instantly. If nothing happens , you should deflate the wheel further. If you deflated enough , another wheel will be highlighted . Continue until all wheel preures 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