Mazda CX-7 2007 Workshop Manual page 1450

STEP
• Push PRESET buttons and check preset
5
conditions.
• Has preset been stored?
• Is aftermarket electronic equipment (two-way
6
radio, navigation system, mobile phone, etc.)
installed?
Note
• TV antenna located closely to audio
antenna can be cause of noise. Relocate
TV antenna.
• Remove aftermarket electronic equipment.
7
• Turn audio unit ON and check reception
condition.
• Is reception improved?
• Refer to confirmation step 3, and inspect
8
antenna system.
• Is a whirring sound present?
• Inspect antenna plug connection condition.
9
• Is connection okay?
• Turn ignition switch to LOCK position.
10
• Measure continuity between antenna feeder
axis and ground.
• Is there any continuity?
• Compare reception with other audio unit on
11
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 feel
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.
End Of Sie
09-03E–4
SYMPTOM TROUBLESHOOTING [RADIO]
INSPECTION
Yes The system is normal.
No Preset broadcasting stations.
Yes Go to the next step.
No Go to the Step 8.
Yes The system is normal.
(Explain to customers that aftermarket electronic equipment
is cause of noise)
No Go to the next step.
Yes Replace audio unit.
No Go to the next step.
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 Replace audio unit.
ACTION