1998 Chevy Camaro

I was driving my moms 1998 chevy camaro today. When I started it up I noticed that the security light was on. It is a yellow light. I shyt the car off and it came on again. I drove it and it doesnt go away. I figured her key was bad. So I put my dads key in it and started it it still came up and the light never goes away. I put my scanner on it and it didnt pull up any codes. Why is this on and what can I do to correct it. Thanks.