My stereo stopped working?

Question

This is a stock Chrysler Infinity stereo in a 95 Jeep Grand Cherokee. It was working fine until I changed the battery in the vehicle. After I changed it, the stereo would play, but I could not change any stations or adjust the volume, or even turn it off. So I turned off the vehicle and restarted it, the stereo does not play or display the time. But all the buttons light up when I turn on my headlights. Is there some sort of security thing that effects the stereo when the battery is changed?

Answer 1

I'm not sure about '95 Chrysler products, but many manufactuters require you to input a specific security code after disconnecting power to the unit as a security feature against theft.