Poor AM or FM radio reception or interference
NOTE:
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Check the vehicle battery condition first.
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Check the connectors for poor connections or loose terminals.
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Check the radio reception in an open area.
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Compare it to a known-good vehicle of the same model, year, and trim level whenever possible.
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If necessary, have the customer demonstrate the symptom.
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Poor reception/interference can be caused by the following:
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The radio station is far away.
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Atmospheric conditions are unfavorable.
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Tall buildings, mountains, or high-voltage power lines are nearby.
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Non-standard antenna element.
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Check if the radio reception/interference is the same as the known-good vehicle in several locations.
Is the reception/interference the same?
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YES
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NO
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Multipath interference or weak station. Operation is normal.■
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Check the reception/interference while the engine is running, and compare it to the known-good vehicle.
Is there noise (static or whine) only with the engine running?
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YES
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Check the antenna and radio grounds. If OK, check the charging system, fuel injection system (fuel pump), HVAC (blower motor), and the ignition system.■
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NO
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Make sure turn the ignition switch to LOCK (0).
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Check the AM/FM antenna element for cracks, or other damage. Make sure that the AM/FM antenna element isn't loose.
NOTE: Do not use any tools to tighten the AM/FM antenna element.
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Disconnect AM/FM antenna 3P connector.
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Turn the ignition switch to ON (II).
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Turn on the audio unit.
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Measure the voltage between the AM/FM antenna 3P connector No. 3 terminal and body ground.
Is there battery voltage?
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Turn the ignition switch to LOCK (0).
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Turn the ignition switch to ON (II).
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Turn on the audio unit.
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