if your referring to the anti theft light god help you lol!! this lil flashing red light always turns on when you turn off your car now if your referring to when you turn your car on it asks for the code then just punch it in but if you have to do this every time you turn your car off and start it again then you might have a problem in which i cant help you with good luck Hi I jave a 1990 325i and everytine I turn the car off, the radio code light comes on. Could anyone give me a little advice on fixing this?