NO. 1 AF NOISE OR POP NOISE ON ALL SOURCES (RADIO, CD, CASSETTE TAPE)
| 1 | AF noise or POP noise on all sources (Radio, CD, Cassette tape)/Possible DTC: 09:Er20, 09:Er21 |
|---|---|
| Troubleshooting hints Low vehicle battery voltage. Jammed radio signals from after market equipment. Speaker malfunction (e.g., any foreign material, broken) Improper speaker installation Audio unit malfunction Audio amplifier malfunction (with BOSE) Poor connection of audio unit connector, terminal damage Antenna malfunction (e.g., poor ground) Open or short circuit in wiring harness between audio amplifier and ground (with BOSE) Woofer malfunction (with BOSE) Poor connection of woofer connector, terminal damage (with BOSE) NOTE: AF noise is "Petit Petit" noise that generally occurs with switch ON/OFF operations of electrical equipment other than the audio unit, or "Gee" continual noise that occurs when electrical equipment is operated. This is caused by noise entrance to the power supply wiring, signal wiring, speaker cable or head of cassette deck etc. Therefore noise can be heard regardless of radio wave condition or audio volume position. The noise will start after one click from the minimum position of volume button but normally does not change even when volume is turned to higher position. POP noise is "Putsun", "Poco" or "Putsun" noise that occurs with switch ON/OFF operation of the audio unit, or with switching Radio to CD. Even normal audio unit sometimes emit small noise depending on conditions. | |
| NOTE |
|---|
| AF noise is "Petit Petit" noise that generally occurs with switch ON/OFF operations of electrical equipment other than the audio unit, or "Gee" continual noise that occurs when electrical equipment is operated. This is caused by noise entrance to the power supply wiring, signal wiring, speaker cable or head of cassette deck etc. Therefore noise can be heard regardless of radio wave condition or audio volume position. The noise will start after one click from the minimum position of volume button but normally does not change even when volume is turned to higher position. POP noise is "Putsun", "Poco" or "Putsun" noise that occurs with switch ON/OFF operation of the audio unit, or with switching Radio to CD. Even normal audio unit sometimes emit small noise depending on conditions. |
TROUBLESHOOTING HINTS - AF NOISE OR POP NOISE ON ALL SOURCES (RADIO, CD, CASSETTE TAPE)
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 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 system 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 aftermarket equipment installed? (Inspect especially near the antenna). Radar Remote engine starter Anti-theft device Other | Yes | Go to the next step. |
| No | Go to the Step 5. | ||
| 4 | Remove the aftermarket equipment. Turn the audio system on. Is there any noise? | Yes | Go to the next step. |
| No | The system is normal. The aftermarket electrical devices might make a noise. | ||
| 5 | Is there the noise from all speakers? | Yes | Go to the 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 on the speaker: Remove the foreign material from the speaker. If the speaker is malfunctioning: Replace the speaker. (See FRONT DOOR SPEAKER REMOVAL/INSTALLATION. ) (See REAR DOOR SPEAKER REMOVAL/INSTALLATION. ) (See WOOFER REMOVAL/INSTALLATION [SPORT SEDAN]. ) (See WOOFER REMOVAL/INSTALLATION [5-DOOR, SPORT WAGON]. ) (See TWEETER REMOVAL/INSTALLATION. ) 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 customer's vehicle? | Yes | Go to the next step, (with BOSE) Go to Step 11. (without BOSE) |
| 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 audio power and/or mode switch. | ||
| 8 | Is there any noise from the woofer? | Yes | Go to the next step. |
| No | Go to Step 11. | ||
| 9 | Turn the ignition switch to the LOCK position. Remove the woofer. Inspect the connection of the woofer connector (6-pin) terminal A (B+), B (GND), G (WOOF IN+) and H (WOOF IN-). Is the connector connected securely? | Yes | Replace the woofer. (See WOOFER REMOVAL/INSTALLATION [SPORT SEDAN]. ) (See WOOFER REMOVAL/INSTALLATION [5-DOOR, SPORT WAGON]. ) |
| No | Repair or replace the terminal or connector. Go to the next step. | ||
| 10 | Is there any noise? | Yes | Replace the woofer. (See WOOFER REMOVAL/INSTALLATION [SPORT SEDAN]. ) (See WOOFER REMOVAL/INSTALLATION [5-DOOR, SPORT WAGON]. ) |
| No | The system is normal. | ||
| 11 | 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 Step 13. (with BOSE) Go to Step 14. (without BOSE) |
| No | Repair or replace the terminal or connector. Go to the next step. | ||
| 12 | Is there any noise? | Yes | Go to the next step, (with BOSE) Go to Step 14. (without BOSE) |
| No | The system is normal. | ||
| 13 | Turn the ignition switch to the LOCK position. Disconnect the audio amplifier connector. Inspect between the audio amplifier wiring harness-side connector (26-pin) terminal V and ground. Is there continuity? | Yes | Go to Step 15. |
| No | Repair or replace the terminal or connector. Go to the next step. | ||
| 14 | Is there any noise? | Yes | Go to the next step. |
| No | The system is normal. | ||
| 15 | Inspect the ground condition of the manual antenna. Is the ground condition normal? | Yes | Replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION. ) |
| No | Repair or replace the ground: Go to the next step. | ||
| 16 | Is there any noise? | Yes | Replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION. ) |
| No | The system is normal. | ||
| NOTE |
|---|
| The noise may be heard depends on the operating speed of audio power and/or mode switch. |
DIAGNOSTIC PROCEDURE
NO. 2 NOISE FROM RADIO (AM ONLY)
| 2 | Noise from radio (AM only)/Possible DTC: 09:Er22 |
|---|---|
| POSSIBLE CAUSE | Antenna rod not installed Jamming from aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc.] Noise from electrical system on vehicle (e.g. fuel pump) Battery malfunction Charging system malfunction Audio unit malfunction Antenna plug poor connection Antenna feeder malfunction Electronic jamming from outside, or inferior condition of broadcasting station radio wave Antenna installation loosened |
POSSIBLE CAUSE (NOISE FROM RADIO - AM ONLY)
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | Tune to local broadcasting station and check reception condition. Is reception okay? | Yes | Tune to correct frequency of broadcasting station. If not preset, preset it. |
| No | Go to the next step. | ||
| 2 | Inspect antenna rod condition. Is antenna rod installed? | Yes | Go to the next step. |
| No | Advise customer to install antenna rod when radio is used. | ||
| 3 | Is aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc). installed? NOTE: TV antenna located closely to audio antenna can be cause of noise. Relocate TV antenna. | Yes | Go to the next step. |
| No | Go to Step 5. | ||
| 4 | Remove aftermarket electronic equipment. Turn audio unit on and check reception condition. Is reception improved? | Yes | The system is normal. (Explain to customers that aftermarket electronic equipment is cause of noise) |
| No | Go to the next step. | ||
| 5 | Measure battery voltage. Is battery voltage okay? Standard With ignition switch ON: 11.5 V or more At idling: 12.5 V or more NOTE: Inspect that battery cables are connected to terminals securely. | Yes | Go to the next step. |
| No | Charge battery. Inspect charging system, and repair or replace if necessary. | ||
| 6 | Is noise occurring only when vehicle electrical system (e.g. fuel pump) operates? NOTE: Identify subject electrical component by disconnecting fuse, turning switch ON & OFF, or disconnecting & connecting connector. It will be easy when simulation function on M-MDS is used. | Yes | Go to the next step. |
| No | Go to Step 8. | ||
| 7 | Inspect power supply, ground condition, and noise prevention capacitor for electrical component. Is noise present after inspection? NOTE: Inspect following: Power supply to electrical component for voltage drop (compare with battery voltage) Resistance between ground of electrical component and body. (Should be close to 0 ohm) Installation condition of noise prevention capacitor for fuel pump etc. | Yes | Go to the next step. |
| No | Troubleshooting completed. NOTE: The audio unit supplies 12 V battery power to the antenna amplifier for the AM radio reception in the radio mode. The audio unit cannot receive the AM signals without the 12 V battery power to the antenna amplifier. If the AM signals become strong, the audio unit may receive the signal with noises. | ||
| 8 | Inspect antenna plug connection condition. Is connection okay? | Yes | Go to the next step. |
| No | Insert antenna plug securely. | ||
| 9 | Turn the ignition switch to the LOCK position. Measure continuity between antenna feeder axis and ground. Is there any continuity? | Yes | Replace antenna feeder. (See ANTENNA FEEDER LOCATION [SPORT SEDAN]. ) (See ANTENNA FEEDER LOCATION [5-DOOR]. ) (See ANTENNA FEEDER LOCATION [SPORT WAGON]. ) |
| No | Go to the next step. | ||
| 10 | Compare reception with other audio unit on 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 easy to be conspicuous) Noise decrease type: It decreases volume when signals become weak, so that noise is not conspicuous. | Yes | The system is normal (It is caused by electronic jamming from outside, or inferior broadcasting station signal condition). |
| No | Go to the next step. | ||
| 11 | Retighten ground for antenna and antenna amplifier. Retighten antenna rod. Is noise present, after retightening? | Yes | Replace audio unit. (See CENTER PANEL UNIT REMOVAL/INSTALLATION. ) (See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY. ) (See AUDIO UNIT DISASSEMBLY/ASSEMBLY. ) |
| No | Troubleshooting completed. | ||
| NOTE |
|---|
| TV antenna located closely to audio antenna can be cause of noise. Relocate TV antenna. |
| NOTE |
|---|
| Inspect that battery cables are connected to terminals securely. |
| NOTE |
|---|
| Identify subject electrical component by disconnecting fuse, turning switch ON & OFF, or disconnecting & connecting connector. It will be easy when simulation function on M-MDS is used. |
| NOTE |
|---|
| Inspect following: Power supply to electrical component for voltage drop (compare with battery voltage) Resistance between ground of electrical component and body. (Should be close to 0 ohm) Installation condition of noise prevention capacitor for fuel pump etc. |
| NOTE |
|---|
| The audio unit supplies 12 V battery power to the antenna amplifier for the AM radio reception in the radio mode. The audio unit cannot receive the AM signals without the 12 V battery power to the antenna amplifier. If the AM signals become strong, the audio unit may receive the signal with noises. |
| 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 easy to be conspicuous) Noise decrease type: It decreases volume when signals become weak, so that noise is not conspicuous. |
DIAGNOSTIC PROCEDURE
NO. 3 NOISE FROM RADIO (FM ONLY)
| 3 | Noise from radio (FM only)/Possible DTC: 09:Er22 |
|---|---|
| POSSIBLE CAUSE | Antenna rod not installed Jamming from aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc). Noise from electrical system on vehicle (e.g. fuel pump) Battery malfunction Charging system malfunction Audio unit malfunction Antenna plug poor connection Antenna feeder malfunction Electronic jamming from outside, or inferior condition of broadcasting station radio wave Antenna installation loosened NOTE: FM broadcast has feature "sound quality is good" and "resistant to noise", but FM broadcast has particular noises. Though audio unit is designed to reduce noise, there are times noise occurs due to conditions. |
| NOTE |
|---|
| FM broadcast has feature "sound quality is good" and "resistant to noise", but FM broadcast has particular noises. Though audio unit is designed to reduce noise, there are times noise occurs due to conditions. |
POSSIBLE CAUSE (NOISE FROM RADIO - FM ONLY)
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | Tune to local broadcasting station and check reception condition. Is reception okay? | Yes | Tune to correct frequency of broadcasting station. If not preset, preset it. |
| No | Go to the next step. | ||
| 2 | Inspect antenna rod condition. Is antenna rod installed? | Yes | Go to the next step. |
| No | Advise customer to install antenna rod when radio is used. | ||
| 3 | Is aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc). installed? | Yes | Go to the next step. |
| No | Go to Step 5. | ||
| 4 | Remove aftermarket electronic equipment. Turn audio unit ON and check reception condition. Is reception improved? | Yes | The system is normal. (Explain to customers that aftermarket electronic equipment is cause of noise) |
| No | Go to the next step. | ||
| 5 | Measure battery voltage. Is battery voltage okay? Standard With ignition switch ON: 11.5 V or more At idling: 12.5 V or more NOTE: Inspect that battery cables are connected to terminals securely. | Yes | Go to the next step. |
| No | Charge battery. Inspect charging system, and repair or replace if necessary. | ||
| 6 | Is noise occurring only when vehicle electrical system (e.g. fuel pump) operates? NOTE: Identify subject electrical component by disconnecting fuse, turning switch ON & OFF, or disconnecting & connecting connector. It will be easy when simulation function on M-MDS is used. | Yes | Go to the next step. |
| No | Go to Step 8. | ||
| 7 | Inspect power supply, ground condition, and noise prevention capacitor for electrical component. Is noise present after inspection? NOTE: Inspect following: Power supply to electrical component for voltage drop (compare with battery voltage) Resistance between ground of electrical component and body. (Should be close to 0 ohm) Installation condition of noise prevention capacitor for fuel pump etc. | Yes | Go to the next step. |
| No | Troubleshooting completed. | ||
| 8 | Inspect antenna plug connection condition. Is connection okay? | Yes | Go to the next step. |
| No | Insert antenna plug securely. | ||
| 9 | Turn ignition switch to LOCK position. Measure continuity between antenna feeder axis and ground. Is there any continuity? | Yes | Replace antenna feeder. (See ANTENNA FEEDER LOCATION [SPORT SEDAN]. ) (See ANTENNA FEEDER LOCATION [5-DOOR]. ) (See ANTENNA FEEDER LOCATION [SPORT WAGON]. ) |
| No | Go to the next step. | ||
| 10 | Compare reception with other audio unit on same model (model/unit) under same problem conditions. Is reception equivalent between customer's unit and compared unit? | Yes | The system is normal (It is caused by electronic jamming from outside, or inferior broadcasting station signal condition). |
| No | Go to the next step. | ||
| 11 | Retighten ground fixation for antenna installation part and antenna amplifier. Retighten antenna rod. Is noise present, after retightening? NOTE: When antenna is not grounded properly, FM noise is likely to be noticed. | Yes | Replace audio unit. (See CENTER PANEL UNIT REMOVAL/INSTALLATION. ) (See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY. ) (See AUDIO UNIT DISASSEMBLY/ASSEMBLY. ) |
| No | Troubleshooting completed. | ||
| NOTE |
|---|
| Inspect that battery cables are connected to terminals securely. |
| NOTE |
|---|
| Identify subject electrical component by disconnecting fuse, turning switch ON & OFF, or disconnecting & connecting connector. It will be easy when simulation function on M-MDS is used. |
| NOTE |
|---|
| Inspect following: Power supply to electrical component for voltage drop (compare with battery voltage) Resistance between ground of electrical component and body. (Should be close to 0 ohm) Installation condition of noise prevention capacitor for fuel pump etc. |
| NOTE |
|---|
| When antenna is not grounded properly, FM noise is likely to be noticed. |
DIAGNOSTIC PROCEDURE