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Audio System Symptom Troubleshooting - Audio system sound is weak or distorted (display is normal)

Audio system sound is weak or distorted (display is normal)
NOTE:
  • Check the vehicle battery condition first.
  • Check the connectors for poor connections or loose terminals.
  1. Turn the ignition switch to ON (II).
  1. Turn on the audio unit and check for sound in each mode (AM, FM, and CD).
Is there sound from the speakers, and is the sound quality normal in each mode?
YES -
Intermittent failure. The system is OK at this time. Check for loose connections at the audio unit and each speaker.■
NO -
Speakers all work, sound quality is poor.■