Dash warning lights are there to inform the driver of vehicle conditions and operations.
Blue, white, and green colored lights tell you that something is on or functioning, examples:Blue headlight - high beams are on
Blue thermostat (Beetle) - coolant temperature is low, goes out when warm
Flashing green left and/or right pointing arrow - left turn, right turn or flashers
White arrow pointing at person in seat - indicates where the air blowing
Yellow solid lights are telling the driver something needs to be taken care of:
Fuel pump - fuel is low time to stop at a fueling station
EPC light - needs to be taken in, but normally the vehicle can operate for a short amount of time
Engine or check engine - same as above
Brake pad warning - time to replace front or rear brakes
Glow plug light (diesel) - glow plugs are warming up
Yellow flashing lights, something needs attention now:
Engine or check engine - pull over as soon as safe, have vehicle towed into shop
Thermostat - may need coolant, if coolant full have towed into shop (caution - coolant under pressure do not open coolant bottle when vehicle is hot)
Glow plug light (diesel) - have vehicle towed in
Traction control light/ESP - Vehicle may have lost traction, light will go out once traction is restored.
Red warning/indicator lights, something needs to be done before driving:
Brake light - release the brake before driving
Thermostat - overheat condition, do not drive. Tow to shop if not resolved.
Flashing red light urgent/emergency:
Brake light - do not drive, brakes failure possible
These are just some examples. There are too many to go through them all but we hope this gives you an idea.