1. Ensure that the car is in the "ON" or "ACC" position.
2. Check the fuse box for a blown fuse labeled "RADIO" or "AUDIO". If the fuse is blown, replace it with a new fuse of the same amperage.
Step 2: Check Radio Wiring
1. Turn off the car and disconnect the battery.
2. Remove the radio from the dashboard.
3. Inspect the wiring harness for any loose, damaged, or disconnected wires.
4. Reconnect the battery and turn on the car.
Step 3: Check CD Changer
1. If the radio is still not displaying the CD player, it is possible that the CD changer itself is faulty.
2. Disconnect the CD changer from the radio and try using a different CD player.
3. If the other CD player works, then the CD changer is likely faulty and will need to be replaced.
Step 4: Reset Radio
1. If none of the above steps work, it may be necessary to reset the radio.
2. Disconnect the battery and wait for a few minutes.
3. Reconnect the battery and turn on the car.
4. Try using the CD player again.
If the CD player is still not working after following these steps, it is likely that there is a more serious problem with the radio or CD changer that will require professional repair.