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Your Corolla has daytime running lights (DRLs). A photocell determines whether it is day or night. Your DRLs turn on automatically in daytime without you operating the light control ("headlight") switch. Your DRLs are actually your headlights on low beam. At night, the photocell senses it is dark and disables the DRLs. When you set the light control ("headlight") switch to HEAD, the head relay closes and the headlights should turn on. Since they don't, I suggest opening the engine room junction block and checking the 40A MAIN fuse and the 10A LEFT HEAD (UPPER) and RIGHT HEAD (UPPER) fuses. In engine room relay block 5, check the 10A LH-LWR HEAD and RH-LWR HEAD fuses. Replace any blown fuses and the headlights should be working normally again
I bought a 2000 polo 1.4 yesterday after having an MOT. The warning lamp came on today but the car is running fine. Whether its the Lambda sensor or just the light itself is a common fault, I think garages turn off the lights to get it through the MOT then they come on again in a day or two!