Why is the tire pressure monitoring not displaying on the Envision?

[LaAnderson]

If the tire pressure monitoring is not displaying on the Envision, it may be due to a dead battery in the tire pressure sensor. Below are the methods of tire pressure monitoring: 1. Direct Tire Pressure Monitoring: Direct tire pressure monitoring devices use pressure sensors installed in each tire to directly measure the tire's air pressure. The pressure information is transmitted wirelessly from inside the tire to a central receiver module, which then displays the tire pressure data for each tire. When the tire pressure is too low or there is a leak, the system will automatically issue an alert. 2. Indirect Tire Pressure Monitoring: The working principle of indirect tire pressure monitoring is that when the pressure in a tire decreases, the weight of the vehicle will cause the rolling radius of that wheel to become smaller, resulting in a faster rotation speed compared to the other wheels. By comparing the differences in rotation speeds between tires, the system monitors the tire pressure. Indirect tire pressure alert systems essentially rely on calculating the rolling radius of the tires to monitor air pressure.