2004 Subaru Legacy review

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For AT models
This light flashes if the vehicle is driven with tires of different diameters fitted on its wheels or with the air pressure excessively low in any of its tires. ...

Vanity mirror with light
CAUTION Keep the vanity mirror cover closed while the car is being driven to avoid being blinded by glare. To use the vanity mirror, swing down the sun visor and open the vanity mirror cover. ...

Low tire pressure warning light (U.S.-spec. models)
When the ignition switch is turned to the “ON” position, the low tire pressure warning light will illuminate for approximately 2 seconds to check that the tire pressure monitoring system (TPMS) ...