Mazda CX 7. Manual — part 364
SYMPTOM TROUBLESHOOTING [RADIO]
09-03E–7
09-03E
End Of Sie
5
• Measure battery voltage.
• Is battery voltage okay?
Standard
With ignition switch ON: 11.5 V or more
At idling: 12.5 V or more
Note
• Inspect that battery cables are connected
to terminals securely.
Yes
Go to the next step.
No
Charge battery. Inspect charging system, and repair or
replace if necessary.
6
• Is noise occurring only when vehicle
electrical system (e.g. fuel pump) operates?
Note
• Identify subject electrical component by
disconnecting fuse, turning switch ON &
OFF, or disconnecting & connecting
connector.
• It will be easy when simulation function on
M-MDS is used.
Yes
Go to the next step.
No
Go to the Step 8.
7
• Inspect power supply, ground condition, and
noise prevention capacitor for electrical
component.
• Is noise present after inspection?
Note
• Inspect following:
— Power supply to electrical component
for voltage drop (compare with battery
voltage)
— Resistance between ground of
electrical component and body.
(Should be close to 0 ohm)
— Installation condition of noise
prevention capacitor for fuel pump etc.
Yes
Go to the next step.
No
Troubleshooting completed.
8
• Inspect antenna plug connection condition.
• Is connection okay?
Yes
Go to the next step.
No
Insert antenna plug securely.
9
• Turn ignition switch to LOCK position.
• Measure continuity between antenna feeder
axis and ground.
• Is there any continuity?
Yes
Replace antenna feeder.
No
Go to the next step.
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?
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.
11
• Retighten ground fixation for antenna
installation part and antenna amplifier.
Retighten antenna rod.
• Is noise present, after retightening?
Note
• When antenna is not grounded perfectly,
FM particular noise is likely to be
conspicuous.
Yes
Replace audio unit.
No
Troubleshooting completed.
STEP
INSPECTION
ACTION
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SYMPTOM TROUBLESHOOTING [RADIO]
09-03E–8
NO.4 CANNOT TUNE (SEEK DOES NOT STOP)[RADIO]
id0903e3804600
Diagnostic procedure
End Of Sie
4
Cannot tune (SEEK does not stop)/Possible DTC: 09:Er20, 09:Er22
POSSIBLE
CAUSE
• Center panel malfunction
• Antenna plug poor connection
• Antenna feeder malfunction
• Audio unit malfunction
• Electronic jamming from outside, or inferior condition of broadcasting station radio wave
• Antenna rod not installed
STEP
INSPECTION
ACTION
1
• Inspect if feel of SEEK button is normal when
button is pushed and released.
• Is it okay?
Yes
Go to the next step.
No
Perform confirmation step 1: audio panel switch
confirmation. Replace center panel if necessary.
2
• Inspect indication of LCD.
• Is frequency indication increased or
decreased when SEEK button is pushed?
Yes
Go to the next step.
No
Perform confirmation step 1: audio panel switch
confirmation. Replace center panel if necessary.
3
• Manually tune to local broadcasting station
and check reception condition.
• Is reception okay?
Yes
Go to the Step 6.
No
Go to the next step.
4
• Inspect antenna plug connection condition.
• Is connection okay?
Yes
Go to the next step.
No
Insert antenna plug securely.
5
• Turn ignition switch to LOCK position.
• Measure continuity between antenna feeder
axis and ground.
• Is there any continuity?
Yes
Replace antenna feeder.
No
Go to the next step.
6
• Check if number of broadcasting stations
changes depending on time and place.
• Does it change?
Yes
The system is normal. (Explain to customer that SEEK
sometimes does not stop depending on signal reception
condition.)
Note
• Signals tend to reach longer distances at night. It is
conspicuous in AM signals, several audio functions
may stop due to foreign broadcasting station or noise.
Though the audio system restrains sensitivity of
SEEK and SCAN functions at night, the audio system
may select other than desired broadcasting station
when signals are considerably strong.This function is
linked to the parking light. When the parking light or
headlight is turned on, SEEK and SCAN may not
function for weak signals.
No
Replace audio unit.
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SYMPTOM TROUBLESHOOTING [RADIO]
09-03E–9
09-03E
NO.5 CANNOT PRESET (PRESET FUNCTION DOES NOT OPERATE)[RADIO]
id0903e3804700
Diagnostic procedure
End Of Sie
NO.6 RECEPTION FREQUENCY OF RADIO SLIPS[RADIO]
id0903e3804800
Diagnostic procedure
End Of Sie
5
Cannot preset (preset function does not operate)/Possible DTC: 21:Er19
POSSIBLE
CAUSE
• Audio unit malfunction
• Center panel malfunction
STEP
INSPECTION
ACTION
1
• Tune to desired station and push channel
preset button 1 for about 2 seconds to store
it.
• Repeat above for other stations using
channel preset buttons 2 to 5.
• Push channel preset button 1 to 6 one by
one.
• Are stored stations present?
Yes
Go to the next step.
No
Go to the Step 3.
2
• Turn ignition switch to LOCK and then to
ACC.
• Check if preset stations are stored by
pushing preset buttons.
• Are stations stored?
Yes
The system is normal. (Explain preset procedure to
customer using Owner’s Manual)
No
Replace audio unit.
3
• Remove center panel from audio unit, and
reinstall center panel to audio unit.
• Turn audio power switch ON.
• Press the POWER button and
simultaneously press the CLOCK button for
approx. 1s.
• Push all buttons and check if buzzer sounds.
• Are all buttons okay?
Yes
Replace audio unit.
No
Replace center panel.
6
Reception frequency of radio slip/Possible DTC: 09:Er22
POSSIBLE
CAUSE
• Audio unit malfunction
• Electronic jamming from outside, or inferior condition of broadcasting station radio wave
STEP
INSPECTION
ACTION
1
• Push SEEK button and check if desired
broadcasting station is tuned.
• Is it okay?
Yes
Go to the Step 3.
No
Go to the next step.
2
• Check if other broadcasting station is
received at certain place when indication of
reception frequency stays.
• Is other station received?
Note
• When you receive weak signal from one
broadcasting station and come close to
broadcasting antenna which emits strong
signal, broadcasting with strong signal is
sometimes received.
Yes
Go to the next step.
No
Replace audio unit.
3
• 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?
Yes
Troubleshooting completed (Audio unit is normal).
No
Replace audio unit.
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SYMPTOM TROUBLESHOOTING [RADIO]
09-03E–10
REFERENCE[RADIO]
id0903e3830000
1. Multipath Noise
• Signals from an FM transmitter are a high
frequency and similar to beams of light because
they do not bend around corners, but they do
reflect. Since FM signals can be reflected by
obstructions, it is possible to receive both the
direct signal and the reflected signal at the same
time. This causes a slight delay in reception and
may be heard as a broken sound or a distortion.
2. Flutter/Skip Noise
• Signals become weak in valleys between
mountains, tall building, and other obstacles.
When the vehicle passes through such an area,
the reception conditions may change suddenly,
resulting in annoying noise.
3. Stereo and Monaural Receptions
• As signals become weak, noise may appear more in stereo reception. Comparing to stereo reception, noise in
monaural receptions is relatively less striking.
Measures in Audio System
Separation control
• Utilizing the characteristic of monaural reception that noise is relatively less striking than stereo reception, the
audio system automatically changes the reception from stereo to monaural and lessens annoying noise when
signals become weak or a multipath phenomenon occurs.
High tone control
• When signals become weak or a multipath phenomenon occurs, the audio system restrains volume level in
high frequency band and lessens annoying noise.
Effect Setting of Separation Control and High Tone Control
• The separation and high tone controls influence sound quality, Therefore they are specifically tuned for
individual model. (Comparison of characteristic must be done on the same models)
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Noise restraint setting
High tone setting
Wider effective range
Less effective range
Noise is less conspicuous
Noise is conspicuous
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