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STEP
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INSPECTION
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ACTION
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1
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• Turn the audio unit ON.
• Is the LCD indicated correctly?
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Yes
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Go to the Step 3.
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No
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Go to the next step.
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2
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• Measure voltage at +B and ACC terminals.
• Is voltage okay?
Specification
• With ignition switch ON: 11.5V or more
At idling: 12.5V or more
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Yes
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Go to the next step.
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No
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Follow diagnostic procedure for symptom No. 2 (Entire audio system).
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3
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• Set volume to 10 to 15.
• Is buzzing sound or voice confirmed?
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Yes
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Go to the next step.
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No
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Follow diagnostic procedure for symptom No. 3 (Entire audio system) or No. 4 (Entire audio system).
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4
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• Tune to local broadcasting station and check reception condition.
• Is reception okay?
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Yes
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Go to the next step.
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No
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Go to the Step 6.
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5
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• Push preset buttons and check preset conditions.
• Has preset been stored?
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Yes
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The system is normal.
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No
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Preset broadcasting stations.
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6
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• Is aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc.) installed?
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Note
TV antenna located closely to audio antenna can be cause of noise. Relocate TV antenna.
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Yes
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Go to the next step.
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No
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Go to the Step 8.
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7
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• Remove aftermarket electronic equipment.
• Turn audio unit ON and check reception condition.
• Is reception improved?
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Yes
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The system is normal.
(Explain to customers that aftermarket electronic equipment is cause of noise)
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No
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Go to the next step.
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8
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• Refer to confirmation step 3, and inspect antenna system.
• Is whirring sound present?
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Yes
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Replace audio unit.
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No
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Go to the next step.
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9
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• Inspect antenna plug connection condition.
• Is connection okay?
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Yes
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Go to the next step.
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No
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Insert antenna plug securely.
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10
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• Turn ignition switch to LOCK position.
• Measure continuity between antenna feeder axis and ground.
• Is there any continuity?
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Yes
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Replace antenna feeder.
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No
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Go to the next step.
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11
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• Compare reception with other audio unit on same model (model/unit) under same problem conditions.
• Is reception equivalent between customers unit and compared unit?
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Note
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• Due to following differences, you may feel difference in reception efficiency
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(Vehicle side factor)
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• Antenna installation location, height, feeder wiring routing, optional electrical equipment
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(Audio unit factor)
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• Volume concern type: It decreases change of volume when signals become weak.
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(Noise is easy to be conspicuous)
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• Noise decrease type: It decreases volume when signals become weak, so that noise is not conspicuous.
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Yes
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The system is normal.
(It is caused by electronic jamming from outside, or inferior broadcasting station signal condition.)
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No
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Replace audio unit.
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