I cannot understand how Volvo selling $40K to $60K plus cars can get away with the most rudimentary tire monitor system I ever saw. Even cars like Honda Civics and others in its price point display instantly the actual tire pressure in psi.
Using just a green indicator if the tire pressure is within acceptable standard was appropriate in the 80s. To make matters worse, you cannot check the status until the car is driven for a few minutes. Who thinks of such things?
Also, if their pressure accuracy tolerance is a standard 10%, that means that a tire can be at 30 psi, while another one is at 36 psi and we would simply see all green...Terrible!