Audio System Sound is Weak or Distorted (Display is Normal)

Audio system sound is weak or distorted (display is normal)

1. Check for sound in each mode (AM, FM, XM, and disc).

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 navigation unit, audio unit, amplifier, and each speaker.

NO - Speakers all work, sound quality is poor.

- If the sound quality is poor only with the XM radio, or the XM radio does not function, go to poor or no sound with XM radio.
- If the sound quality is poor only with AM or FM radio, go to poor AM or FM radio reception or interference.
- If sound is poor in all modes, go to sound quality diagnosis.