Mazda RX-8 Workshop Manual page 3305

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2011 - RX-8 - Body and Accessories
NO.1 AF NOISE OR POP NOISE AT ALL SOURCES (RADIO, CD) [AUDIO]
1 AF noise or POP noise at all sources (Radio, CD)
Possible
09:Er20, 09:Er21
DTC
POSSIBLE
CAUSE
NOTE:
Low vehicle battery voltage.
Jammed radio signals from after market equipment.
Speaker malfunction (e.g., any foreign material, broken)
Improper speaker installation
Poor connection of audio unit connector, terminal damage
Poor connection of car-navigation unit connector, terminal damage
Poor connection of audio amplifier connector, terminal damage
Antenna malfunction (e.g., poor ground)
Audio unit malfunction
Car-navigation unit malfunction
Audio amplifier malfunction (with Bose
So-called AF noise is a snapping type noise that generally occurs during ON/OFF
switching operations of electrical equipment other than the audio unit/car-
navigation unit, or a continual rasping noise that occurs when electrical
equipment is operated. This is caused by noise interference in the power supply
wiring, signal wiring, speaker cable or audio unit/car-navigation unit. Therefore
noise can be heard regardless of radio wave conditions or the audio volume
position. The noise will start after one click from the minimum position of the
volume button but normally does not change even when volume is turned to a
higher position.
So-called POP noise is snapping or popping type noise that occurs during ON/OFF
switching operation of the audio unit/car-navigation unit, or when switching from
radio to CD. Even a normal audio unit/car-navigation unit sometimes emits a little
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