Had new tires installed. Ever since " service tire system" message has been on.

What is your question?

Before the new tire install I got periodic messages of low tire pressure one tire at a time as needed. Mostly with lower temp changes. Always remedied with proper tire inflation. I should add that " service tire system" message remains even with proper inflation pressure. Can this system be damaged during a tire change ? Where should I start to fix this problem. I'm pretty sure my Pacifica was built June 03.