Chart 14: Radio Noise Entering Through Harness (Backway Noise)

Chart 14 Radio Noise Entering Through Harness (Backway Noise):

BACKWAY NOISE
Noise that enters the audio component through its wiring harness, most commonly detected in the power and ground circuits. (Noise that can be heard at minimum volume and not frontway or sideway noise.)

Some Causes:
^ Poor grounding of the radio or of unsuppressed electrical components.
^ Poorly routed wires.
^ Defective suppression of electrical components.

Solutions:
^ Suppression (capacitors, etc.) preferably can be installed at the noise source, then at the radio or both.
^ Switch pops are backway noise and best suppressed using capacitors.
^ Squeals and buzzes are best suppressed using filter or generator whine packages.

IMPORTANT:
Before proceeding:
^ Check for stored diagnostic trouble codes.
^ Service any known driveability problems.
^ Check for any technical service bulletins on this type of radio noise.