Mazda CX-7 2007 Workshop Manual page 1452

STEP
• Inspect antenna plug connection condition.
8
• Is connection okay?
• Turn ignition switch to LOCK position.
9
• Measure continuity between antenna feeder
axis and ground.
• Is there any continuity?
10 Compare reception with other audio unit on
same model (model/unit) under same problem
conditions.
• Is reception equivalent between customer's
unit and compared unit?
Note
• Due to following differences, you may
detect a difference in reception efficiency.
(Vehicle side factor)
— Antenna installation location, height,
feeder wiring routing, optional electrical
equipment
(Audio unit factor)
— Volume concern type: It decreases
change of volume when signals
become weak. (Noise is conspicuous)
— Noise decrease type: It decreases
volume when signals become weak, so
that noise is not conspicuous.
• Retighten ground fixation for antenna
11
installation part and antenna amplifier.
Retighten antenna rod.
• Is noise present, after retightening?
End Of Sie
NO.3 NOISE FROM RADIO (FM ONLY)[RADIO]
3 Noise from radio (FM only)/Possible DTC: 09:Er22
• Antenna rod not installed
• Jamming from aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc.)
• Noise from electrical system on vehicle (e.g. fuel pump)
• Battery malfunction
• Charging system malfunction
• Audio unit malfunction
• Antenna plug poor connection
POSSIBLE
• Antenna feeder malfunction
CAUSE
• Electronic jamming from outside, or inferior condition of broadcasting station radio wave
• Antenna installation loosened
Note
• FM broadcast has feature "sound quality is good" and "resistant to noise", but FM broadcast has particular
noises. Though audio unit is designed to reduce noise, there are times noise occurs due to conditions.
Diagnostic procedure
STEP
• Tune to local broadcasting station and check
1
reception condition.
• Is reception okay?
• Inspect antenna rod condition.
2
• Is antenna rod installed?
• Is aftermarket electronic equipment (two-way
3
radio, navigation system, mobile phone, etc.)
installed?
• Remove aftermarket electronic equipment.
4
• Turn audio unit ON and check reception
condition.
• Is reception improved?
09-03E–6
SYMPTOM TROUBLESHOOTING [RADIO]
INSPECTION
INSPECTION
Yes Go to the next step.
No Insert antenna plug securely.
Yes Replace antenna feeder.
No Go to the next step.
Yes The system is normal (It is caused by electronic jamming
from outside, or inferior broadcasting station signal
condition).
No Go to the next step.
Yes Replace audio unit.
No Troubleshooting completed.
Yes Tune to correct frequency of broadcasting station.
If not preset, preset it.
No Go to the next step.
Yes Go to the next step.
No Advise customer to install antenna rod when radio is used.
Yes Go to the next step.
No Go to the Step 5.
Yes The system is normal. (Explain to customers that
aftermarket electronic equipment is cause of noise)
No Go to the next step.
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