tire pressure won't show on menu
 

Have a 2003 sl500. When I go to submenu with the outline of the car and the 4 tire pressures it doesn't show pressure for any of the tires. It worked fine until I took off one tire to get a flat fixed. I have reset it mulitple time driven it 10-15 miles and still no tire pressures. What would make it stop working ? Any help would be appreciated