Audio System Sound Is Weak Or Distorted (Display Is Normal)

NOTE:

Check the vehicle battery condition first (see BATTERY TEST ).
Check the connectors for poor connections or loose terminals.

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 connections at the audio-navigation unit, the audio unit, the stereo 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 (see POOR OR NO SOUND WITH XM RADIO (AUDIO-NAVIGATION UNIT DOES DISPLAY XM CHANNELS) (WITH NAVIGATION) ).
- If the sound quality is poor only with AM or FM radio, go to poor AM or FM radio reception or interference (see POOR AM OR FM RADIO RECEPTION OR INTERFERENCE (WITH NAVIGATION) , POOR AM OR FM RADIO RECEPTION OR INTERFERENCE (WITHOUT NAVIGATION WITH XM) , POOR AM OR FM RADIO RECEPTION OR INTERFERENCE (WITHOUT XM) ).
- If the sound is poor in all modes, go to SOUND QUALITY DIAGNOSIS ).