1. Blown Fuse: Check the fuse box for a blown fuse related to the radio. If you find a blown fuse, replace it with a new fuse of the same amperage rating.
2. Loose Wiring: Check the wiring connections behind the radio to ensure that they are secure and not loose. Sometimes, a loose connection can prevent the power from reaching the radio.
3. Faulty Radio: If the fuse and wiring are intact, the issue could lie within the radio itself. In this case, it may be necessary to have the radio repaired or replaced.
4. Aftermarket Stereo Installation: If you have an aftermarket stereo installed in your Daewoo Leganza, make sure it is properly connected and compatible with the vehicle's electrical system. Consult the installation manual or seek assistance from a professional if needed.
5. Software Issues: In rare cases, software-related issues can cause the radio to malfunction. If your vehicle has a newer infotainment system, check for any available software updates that may resolve the problem.
If you are unable to identify or fix the issue yourself, I recommend taking your Daewoo Leganza to a qualified mechanic or auto electrician for a diagnosis and repair.