How do you reset main light on 2012 sienna?

To reset the main light on a 2012 Toyota Sienna, first, ensure the vehicle is in the "On" position without starting the engine. Then, press and hold the trip meter reset button located on the dashboard until the light resets. If the light persists, it may indicate a more significant issue that requires a diagnostic check. Always consult the owner's manual for specific instructions related to your model.