AF NOISE OR POP NOISE AT ALL SOURCES (RADIO, CD) [ENTIRE AUDIO SYSTEM]
id0903e2100500
Possible DTC |
AF noise or POP noise on all sources (Radio, CD) |
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---|---|---|
Using the M-MDS |
U3000:09 |
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Without using M-MDS (On-board diagnostic test mode) |
09:Er21 |
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Possible cause
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• Electronic jamming from outside, or inferior condition of broadcasting station radio wave
• Defective CD (e.g., cracked, badly bent, rough edges, scratch, dirty CD, condensation)
• Vibration while vehicle is driven
• Low vehicle battery voltage.
• Jammed radio signals from after market equipment.
• Speaker malfunction (e.g., any foreign material, broken)
• Improper speaker installation
• Poor connection of audio unit connector, terminal damage
• Antenna malfunction (e.g., poor ground)
• Audio unit malfunction
• Poor connection of audio amplifier connector, terminal damage (with Bose®)
• Audio amplifier malfunction (with Bose®)
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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---|---|---|---|
1
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• Does the noise occur only while in radio mode?
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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 Step 3.
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2
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• Can the location where the noise occurs be specified?
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Yes
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The system is normal. Explain to the customer that the noise is caused by radio wave disturbances or broadcast wave conditions from the outside.
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No
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Go to Step 6.
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3
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• Does the noise occur only while in CD mode?
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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 Step 6.
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4
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• Can the disc in which the noise occurs be specified?
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Yes
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The system is normal. Explain to the customer that the cause is a disc that is damaged or dirty on the playback side, or warped.
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No
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Go to the next step.
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5
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• Drive the vehicle and verify the malfunction symptom.
• Does noise occur while driving on an unlevel road or under other driving conditions (sudden curve, quick operation)?
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Yes
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The system is normal. Explain to the customer that the cause is vibration while the vehicle is driven.
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No
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Go to the next step.
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6
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• Inspect the vehicle battery voltage.
• Is the vehicle battery voltage normal?
Specification:
Switch the ignition to ON.: 11.5 V or more
Idle: 12.5 V 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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Charge the battery, then go to the next step.
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7
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• Is any of the following after-market equipment installed? (Inspect especially near the 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 Step 9.
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8
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• Remove the after-market equipment.
• Turn the audio system to ON.
• Is there any noise?
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Yes
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Go to the next step.
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No
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The system is normal. The after-market electrical devices might make a noise.
|
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9
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• Is there the noise from all speakers?
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Yes
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Go to Step 11.
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No
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Go to the next step.
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10
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• Inspect the suspect speaker.
• Is the speaker normal?
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Yes
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Go to the next step.
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No
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If there is any foreign material on the speaker:
• Remove the foreign material from the speaker.
If the speaker is malfunctioning:
• Replace the speaker.
If the speaker is not installed properly:
• Install the speaker properly.
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11
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• Attempt to duplicate the symptom on the other vehicle.
• Is the noise better than the customer’s vehicle?
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Yes
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Go to the next step.
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No
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The system is normal. Explain the noise generation mechanism to the customer.
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12
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• Switch the ignition to off.
• Remove the audio unit.
• Inspect the connection of the audio unit connector (24-pin) (for sound signal line).
• Is the connector connected securely?
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Yes
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Go to the next step.
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No
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If poor connection of audio unit connector:
• Securely connect the audio unit connector.
If the audio unit side connector is wrong:
• Replace the audio unit.
If the wiring harness-side connector is wrong:
• Repair or replace the pins and/or the connector.
After treating either the above-mentioned, then go to the next step.
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13
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• Inspect the ground condition of the antenna.
• Is the ground condition normal?
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Yes
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Go to the next step.
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No
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Repair or replace the ground. Go to the next step.
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14
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• Is there any noise?
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Yes
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• If noise occurs from the speaker of a specific channel, or the volume is minimized and the noise occurs:
• If noise occurs from the speaker of two or more channels or the volume is minimized and the noise dose not occurs.
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No
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The system is normal.
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