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

NOTE: Check the vehicle battery condition first.

Turn the ignition switch ON (II).
Turn on the audio unit and check for sound in each mode (AM, FM, XM, 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 connection at the audio unit, amplifier, and each speaker.

NO - Speakers all work, sound quality is poor.
- If sound is poor only with XM radio, or the XM radio does not function, go to POOR OR NO SOUND WITH XM RADIO .
- If the sound is poor only with AM or FM, go to POOR AM OR FM RADIO RECEPTION OR INTERFERENCE .
- If sound is poor in all modes, go to SOUND QUALITY DIAGNOSIS .