NO. 1 AF NOISE OR POP NOISE AT ALL SOURCES (RADIO, CD) [AUDIO]
| 1 | AF noise or POP noise at all sources (Radio, CD)/Possible DTC: 09: Er20, 09: Er21 |
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| Troubleshooting hints 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 Poor connection of audio amplifier connector, terminal damage Antenna malfunction (e.g., poor ground) Audio unit malfunction Audio amplifier malfunction (Bose®) NOTE: So-called AF noise is a snapping type noise that generally occurs during ON/OFF switching operations of electrical equipment other than the audio unit, or a continual rasping noise that occurs when electrical equipment is operated. This is caused by noise interference in the power supply wiring, signal wiring, speaker cable or audio unit. Therefore noise can be heard regardless of radio wave conditions or the audio volume position. The noise will start after one click from the minimum position of the volume button but normally does not change even when volume is turned to a higher position. So-called POP noise is snapping or popping type noise that occurs during ON/OFF switching operation of the audio unit, or when switching from radio to CD. Even a normal audio unit sometimes emits a little noise depending on the conditions. |
| NOTE |
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| So-called AF noise is a snapping type noise that generally occurs during ON/OFF switching operations of electrical equipment other than the audio unit, or a continual rasping noise that occurs when electrical equipment is operated. This is caused by noise interference in the power supply wiring, signal wiring, speaker cable or audio unit. Therefore noise can be heard regardless of radio wave conditions or the audio volume position. The noise will start after one click from the minimum position of the volume button but normally does not change even when volume is turned to a higher position. So-called POP noise is snapping or popping type noise that occurs during ON/OFF switching operation of the audio unit, or when switching from radio to CD. Even a normal audio unit sometimes emits a little noise depending on the conditions. |
AF NOISE OR POP NOISE AT ALL SOURCES - POSSIBLE CAUSE
| STEP | INSPECTION | ACTION |
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| 1 | Inspect the vehicle battery voltage. Is the vehicle battery voltage normal? Specification: Ignition switch ON: 11.5 V or more Idle: 12.5 V or more | Yes | Go to the next step. |
| No | Charge the battery, then go to the next step. |
| 2 | Turn the audio unit power to ON. Is there any noise? | Yes | Go to the next step. |
| No | The system is normal. Explain to the customer that the vehicle battery voltage was low. |
| 3 | Is any of the following after-market equipment installed? (Inspect especially near the antenna.) Radar Remote engine starter Anti-theft device Other | Yes | Go to the next step. |
| No | Go to Step 5. |
| 4 | Remove the after-market equipment. Turn the audio unit power to ON. Is there any noise? | Yes | Go to the next step. |
| No | The system is normal. The after-market electrical devices might make a noise. |
| 5 | Is there the noise from all the speakers? | Yes | Go to Step 7. |
| No | Go to the next step. |
| 6 | Inspect the suspect speaker. Is the speaker normal? | Yes | Go to the next step. |
| No | If there is any foreign material to 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. |
| 7 | Attempt to duplicate the symptom on the other vehicle. Is the noise better than the customers vehicle? | Yes | Go to the next step. |
| No | The system is normal. Explain the noise generation mechanism to the customer. NOTE: The noise may be heard depends on the operating speed of the audio power and/or mode switch. |
| 8 | Turn the ignition switch to the LOCK position. Remove the audio unit. Inspect the connection of the audio unit connector (24-pin) (for sound signal line.) Is the connector connected securely? | Yes | Go to the next step. |
| No | If poor connection of audio unit connector: Security connect the audio connector. If the audio unit side connector is wrong: Replace the audio unit. If the wiling 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. |
| 9 | Is there any noise? | Yes | Go to the next step. |
| No | The system is normal. |
| 10 | Inspect the ground condition of the antenna. Is the ground condition normal? | Yes | Replace the audio unit. Go to the next step. |
| No | Repair or replace the ground. Go to the next step. |
| 11 | Is there any noise? | Yes | Without BOSE®: Replace the audio unit. (See CENTER PANEL UNIT REMOVAL/INSTALLATION .) (See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY .) With BOSE®: If noise occurs from the speaker of a specific channel, or the volume is minimized and the noise occurs: Replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION .) If the noise occurs from the speaker of two or more channels or the volume is minimized and the noise does not occurs: Replace the audio unit. (See CENTER PANEL UNIT REMOVAL/INSTALLATION .) (See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY .) |
| No | The system is normal. |
| NOTE |
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| The noise may be heard depends on the operating speed of the audio power and/or mode switch. |
AF NOISE OR POP NOISE AT ALL SOURCES - DIAGNOSTIC PROCEDURE
