Mazda 2010 Mazda3 4-Door Owner's Manual page 234

Interior Comfort
Climate Control System
qSunlight/Temperature Sensor
The fully automatic air conditioner
function measures inside and outside
temperatures, and sunlight. It then sets
temperatures inside the passenger
compartment accordingly.
CAUTION
Do not obstruct either sensor,
otherwise the automatic air
conditioner will not operate properly.
Sunlight sensor
Interior temperature sensor
6-16