Mazda RX-8 Workshop Manual page 3350

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2011 - RX-8 - Body and Accessories
NO.4 NOISE FROM RADIO (FM ONLY) [RADIO]
4 Noise from radio (FM only)/Possible DTC: 09:Er22
POSSIBLE
CAUSE
NOTE:
Diagnostic procedure
STEP
1 Tune to local broadcasting station and
check reception condition.
Is reception okay?
Antenna rod not installed
Jamming from aftermarket electronic equipment (two-way radio, navigation
system, mobile phone, etc.)
Battery malfunction
Noise from electrical system on vehicle (e.g. fuel pump)
Charging system malfunction
Electronic jamming from outside, or inferior condition of broadcasting station
radio wave
Antenna plug poor connection
Antenna feeder malfunction
Antenna installation loosened
Audio unit/car-navigation unit malfunction
FM broadcast has feature "sound quality is good" and "resistant to noise", but
FM broadcast has particular noises. Though audio unit/car-navigation unit is
designed to reduce noise, there are times noise occurs due to conditions.
INSPECTION
YesTune to correct frequency of broadcasting
station.
If not preset, preset it.
ACTION