NOTE: Shorted wiring does not always result in a total loss of sound from the
speaker. If diagnosis indicated condition is associated with speaker or wiring,
refer to Section 15-00.
Experience has shown that rattles and buzzes are caused more often by
loose speakers or speaker mountings, speaker grilles or trim panels than by
damaged or worn speakers. Check for tightness of mountings and trim pieces.
Distortion can be caused by the speaker, radio chassis or wiring. If the
fault is in the radio chassis, both speakers on the same side of the vehicle
will exhibit poor quality. Distortion caused by damaged wiring is most often
accompanied by lower than normal sound output.
Buzzes, rattles, or distorted or weak sound from package tray speakers
are often caused by bent package tray sheet metal around the speaker opening,
or missing or loose attaching hardware or speaker covers. Bent sheet metal
should be straightened and the speaker re-installed. Loose attaching hardware
should be finger-tight plus approximately one full turn. Be careful not to
overtighten hardware as this may bend or deform speaker basket causing buzzes
or distorted sound.
If cause of distortion is not bent rear window tray sheet metal or loose
or missing retaining hardware, refer to speaker diagnosis for one or more
speakers distorted or inoperative.