Mazda CX-7 2007 Workshop Manual page 1449

CONFIRMATION STEP 2: ANTENNA SYSTEM SYMPTOM (EXAMPLE)[RADIO]
Possible cause
• Antenna feeder axis, open circuit
• Antenna feeder plug not attached
• Antenna feeder axis (+) to ground (-), open circuit
• Antenna feeder and antenna, poor ground
• Antenna feeder, jack and plug poor connection
End Of Sie
CONFIRMATION STEP 3: ANTENNA SYSTEM SIMPLE INSPECTION[RADIO]
• Because the antenna system is equipped with a capacitor, the continuity cannot be checked. Therefore
proceed with the following simple inspection.
1. Turn the AM radio on.
2. Tune to the frequency that there is no broadcast and you will hear a buzzing sound.
3. Turn a fluorescent light on and shake it around the antenna rod (around 10—20 mm)
Note
• Use a fluorescent light type for the
inspection. Accurate diagnostic cannot be
done with a different type of light.
4. If a whirring sound from the speaker
synchronized to the work light movement is
confirmed, the antenna system is normal.
End Of Sie
NO.1 NO RADIO RECEPTION (AM/FM)/NO OR LOW VOLUME[RADIO]
1 No radio reception (AM/FM)/no or low volume/Possible DTC: 09:Er20, 09:Er22
• Jamming from aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc.)
• 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 rod is not installed
Diagnostic procedure
STEP
• Turn the audio unit ON.
1
• Is the LCD indicated correctly?
• Measure voltage at B+ and ACC terminals.
2
• Is voltage okay?
Specification
With ignition switch ON: 11.5 V or more
At idling: 12.5 V or more
• Set volume to 10 to 15.
3
• Is buzzing sound or voice confirmed?
• Tune to local broadcasting station and check
4
reception condition.
• Is reception okay?
SYMPTOM TROUBLESHOOTING [RADIO]
AM reception condition
NG: No reception
NG: No reception
YES: Reception possible
(Noise may occur)
NG: No reception
(Depending on connection
conditions)
INSPECTION
YES: Reception possible.
(Sensitivity decreases, but reception is
possible under strong electric field.)
NG: No reception
YES: Reception possible
(Sensitivity decreases, but reception is
possible under strong electric field.)
YES: Reception possible
(Depending on connection conditions)
Yes Go to the Step 3.
No Go to the next step.
Yes Go to the next step.
No Follow diagnostic procedure for symptom No. 2 (Entire
audio system).
Yes Go to the next step.
No Follow diagnostic procedure for symptom No. 3 (Entire
audio system) or No. 4 (Entire audio system).
Yes Go to the next step.
No Go to the Step 6.
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FM reception condition
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ACTION
09-03E–3
09-03E