Repairing a radio on a Ford Focus involves checking the fuses and wiring with a spark tester to find the source of the conductivity failure. Solving radio problems can be as easy as replacing a component of the audio system or as tedious as finding a shortened wire in the interior harness.
Before troubleshooting the audio system the fuses should be checked. A blown fuse will not allow the electricity to enter any of the required audio components. Once checked, follow these instructions to successfully troubleshoot a Ford Focus radio system.
- Turn the key to the "on" position
- Turn on the radio
- Access the faulty speaker
- Check the rest of the wiring
Turn the car on and try to access the radio. If it does not turn on, check the harness for the unit with a voltage tester. Replace if necessary. If the unit works, move on to the next step.
Turn on the radio and use the knobs to control the volume inside the car. Press the fade switches to help narrow down which speaker is not working.
Once the malfunctioning speaker is found, check the wiring using a multimeter. Replace the speaker if necessary.
If the problem persists, use a multimeter to check the voltage on the wiring. Sourcing out an opened or shortened wire can take time. Use the multimeter to find the dead wire and replace it.