NHTSA ID Number: 10238470
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 03/15/23
| APPLICABILITY: | 2018-22MY Legacy and Outback 2018-23MY Crosstrek 2017-23MY Impreza 2019-23MY Forester 2019-22MY Ascent |
| SUBJECT: | New Harman Audio Amplifiers |
INTRODUCTION:
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing the following customer concerns:
Symptom 1: No audio output is heard but, the volume level displayed changes when turning the knob
Symptom 2: Audio volume increases to maximum intermittently without turning the knob
Symptom 3: A buzzing, screeching or crackling-type sound is heard coming through the speakers
Symptom 4: Loss of audio output after turning the head unit off and back on again in a short amount of time
Symptom 5: Audio volume is temporarily louder than expected after ending a Bluetooth call while using navigation guidance
Symptom 6: No response from the volume control knob.
Symptom 7: The system unintentionally enters a reprogramming mode and stops audio function resulting in no audio output. This failure can be temporarily cleared by disconnecting and reconnecting the battery.
PART INFORMATION:
| Description | Exchange Part Number | Application |
| Power Amplifier Assembly | 86221AL01G | Legacy / Outback 2018-19MY |
| 86221AN01C | Legacy / Outback 2020-21MY | |
| 86221AN11B | Legacy / Outback 2022MY | |
| 86221FL00G | Impreza models with Cloth upholstery | |
| 86221FL01G | Impreza models with Leather upholstery | |
| 86221FL016 | Crosstrek | |
| 86221SJ004 | Forester models with Cloth upholstery | |
| 86221SJ014 | Forester models with Leather upholstery | |
| 86221XC01E | Ascent |
NOTE: When ordering the applicable exchange amplifiers from United Radio, the exchange units supplied will contain all the latest available enhancements to address the symptoms as listed on pg. 1 of this bulletin.
SERVICE PROCEDURE:
The causes of Symptoms 1, 2, 4, 5, 6 and 7 are software concerns where in some cases, the amplifier status is not judged properly by the head unit. As a result, volume output is either muted (no output) or at the maximum. Please refer to Appendix section for troubleshooting reference with โNo Soundโ concerns.
The cause of Symptom 3 is a hardware concern within the amplifier circuitry which also requires the unit be replaced with an exchange unit. Follow the procedure below to confirm this condition BEFORE ordering an exchange amplifier.
1. Enter the vehicle and turn the ignition ON.
2. Turn the audio unit on and listen for any unusual sounds from any of the speakers.
3. Pull the hood release lever.
4. Open the Driverโs window fully to retain access to the inside of the vehicle.
5. Turn the ignition OFF.
6. Exit the vehicle and close all the doors.
7. Wait at least 2 minutes before proceeding further.
8. Open the hood and remove the PDI (backup power) fuse.
9. Turn the ignition back on and listen again for any unusual sound from any of the speakers.
10. If the unusual sounds heard originally can no longer be verified, replace the amplifier with an exchange unit. If unusual sounds persist while the fuse is removed, there is another cause which will require further diagnosis.
After confirming the symptom(s) as outlined in the Introduction above exists, order the applicable replacement amplifier following the Audio Exchange Program instructions. Install the exchange unit following the current Service Manual procedure.
REMINDER: The exchange units supplied will contain all the latest available enhancements to address the symptoms as listed on pg. 1 of this bulletin. All exchange amplifiers have the new software and circuitry installed.
ADDITIONAL INFORMATION:
REMINDER: Customer satisfaction and retention starts with performing quality repairs.
After the customer concern has been confirmed, the service procedure for replacing the power amplifier assembly remains unchanged. Always refer to the applicable Service Manual and review the full requirements of the repair being performed. The Service Manual procedures contain information critical to performing an effective repair the first time and every time.
Appendix
โNo Audioโ Troubleshooting – Sound does not come out from the speaker(s)
Please Note: Please check the following three points regardless of the results of the defect diagnosis.
1) If โNo Soundโ is recovered during diagnosis, please specify the condition. (e.g., Remove power, ACC OFFโON, etc.)
2) Please check the part number of the AMP, and if the part number is old, replace it with the latest part number.
3) Please make sure you can hear any beep. (On the head unit go to SettingsโSoundโBeep sounds, turn on BEEP feature )
4) If this is a repeat occurrence for โNo Soundโ (a previous visit fixed โNo Soundโ during diagnosis or with a replacement part), please report via QMR
32 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
SUBARU | ASCENT | 2019-2022 |
| SUBARU | CROSSTREK | 2018-2023 |
| SUBARU | FORESTER | 2019-2023 |
| SUBARU | IMPREZA | 2017-2023 |
| SUBARU | LEGACY | 2018-2022 |
| SUBARU | OUTBACK | 2018-2022 |
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 06/29/23
MC-10238470-0001.pdf 329.392KB
NHTSA ID Number: 10233886
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 03/15/23
NHTSA ID Number: 10226863
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while address in customer concerns.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 11/17/22
MC-10226863-0001.pdf 359.368KB
NHTSA ID Number: 10209913
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 03/02/22
MC-10209913-0001.pdf 341.376KB
NHTSA ID Number: 10205924
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 12/15/21
MC-10205924-0001.pdf 307.354KB
NHTSA ID Number: 10201802
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 09/20/21
MC-10201802-0001.pdf 318.582KB
NHTSA ID Number: 10207185
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 01/13/21
MC-10207185-0001.pdf 319.228KB
NHTSA ID Number: 10191586
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new audio unit amplifier units with revised internal logic designed to optimize efficiency.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 04/09/21
MC-10191586-0001.pdf 318.309KB
NHTSA ID Number: 10188168
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 02/05/21
MC-10188168-0001.pdf 313.511KB
NHTSA ID Number: 10182249
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 10/30/20
MC-10182249-0001.pdf 312.944KB
NHTSA ID Number: 10180730
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimized efficiency.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 09/22/20
MC-10180730-0001.pdf 284.377KB
NHTSA ID Number: 10164389
Manufacturer Communication Number: 15-240-19R
Summary
“This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing the following customer concerns:
Symptom 1: No audio output is heard but, the volume level displayed changes when turning the knob
Symptom 2: Audio volume increases to maximum intermittently without turning the knob
Symptom 3: A buzzing, screeching or crackling-type sound is heard coming through the speakers
Symptom 4: Loss of audio output after turning the head unit off and back on again in a short amount of time
Symptom 5: Audio volume is temporarily louder than expected after ending a Bluetooth call while
using navigation guidance
Symptom 6: No response from the volume control knob.”
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 08/22/19
MC-10164389-0001.pdf 284.594KB
NHTSA ID Number: 10177815
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 07/08/20
MC-10177815-0001.pdf 284.935KB
NHTSA ID Number: 10173195
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 03/31/20
MC-10173195-0001.pdf 285.148KB
NHTSA ID Number: 10165501
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing the following customer concerns:
Symptom 1: No audio output is heard but, the volume level displayed changes when turning the knob
Symptom 2: Audio volume increases to maximum intermittently without turning the knob
Symptom 3: A buzzing, screeching or crackling-type sound is heard coming through the speakers
Symptom 4: Loss of audio output after turning the head unit off and back on again in a short amount of time
Symptom 5: Audio volume is temporarily louder than expected after ending a Bluetooth call while using navigation guidance
Symptom 6: No response from the volume control knob.
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 09/11/19
NHTSA ID Number: 10161817
Manufacturer Communication Number: 15-217-18R
Summary
IMPORTANT: This Service Bulletin has been as been replaced by TSB 15-240-19R entitled “New Harman Audio Amplifiers”. Please refer to this new bulletin for the latest information regarding this condition.
1 Associated Document
Manufacturer Communications
NUMBER: 15-217-18R
DATE: 02/19/18
REVISED: 05/08/19
MC-10161817-9999.pdf 166.059KB
NHTSA ID Number: 10161816
Manufacturer Communication Number: 15-240-19R
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing the following customer concerns:
Symptom 1: No audio output is heard but, the volume level displayed changes when turning the knob
Symptom 2: Audio volume increases to maximum intermittently without turning the knob
Symptom 3: A buzzing, screeching or crackling-type sound is heard coming through the speakers
Symptom 4: Loss of audio output after turning the head unit off and back on again in a short amount of time
Symptom 5: Audio volume is temporarily louder than expected after ending a Bluetooth call while using navigation guidance
Symptom 6: No response from the volume control knob.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19R
DATE: 04/18/19
REVISED: 05/08/19
MC-10161816-9999.pdf 279.861KB
NHTSA ID Number: 10160213
Manufacturer Communication Number: 15-240-19
Summary
This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing the following customer concerns:
- Loss of audio output after turning the head unit off and back on again in a short amount of time
- Audio volume is temporarily louder than expected after ending a Bluetooth call while using navigation guidance
- No response from the volume control knob.
1 Associated Document
Manufacturer Communications
NUMBER: 15-240-19
DATE: 04/18/19
MC-10160213-9999.pdf 269.198KB
- Class D MOSFET Monoblock Power Amplifier
- Peak Power at 1 Ohm: 1,600 Watts | RMS Power at 1 Ohm: 1,200 Watts
- Frequency Response: 20Hz - 250Hz, On-board Bass EQ Switch with +6 or +12dB boost at 45Hz
- Featuring 4-Way Protection Circuitry and 4 Gauge Power & Ground Input Terminals for Maximum Current Flow. Damping Factor - 150<
- Stable at 1 ohm | Remote Subwoofer Level Control Included
- 1400 WATT POWER: The Pyle Dual Channel Car Amplifier is perfect for your vehicle's sound system. Gives you up to 1400W bridgeable output. Features switchable bass boost, variable gain control, configurable electronic crossover network
- GOLD-PLATED RCA PORTS: The RCA ports are gold-plated for eliminating signal loss. A subsonic filter allows low-end interference to be cut so your speakers will always deliver the highest quality audio. Features switchable bass boost, low level inputs
- MOSFET PULSE: The MOSFET pulse width modulation power supply allows for a clean, distortion-free signal to your compact speakers providing you with crisp and clear audio for an outstanding music experience. Also features anti-thump turn on
- THERMAL PROTECTION: To keep both your car and the stereo amp safe, this model is equipped w/ thermal, overload and short circuit protection. Has been specially designed from the bottom up to provide safe and high quality sound in a sturdy form factor
- SLIM SIZE DESIGN: This box amp's small size makes installation a breeze - you'll have no trouble finding a spot for this little yet powerful device. Additional features include LED indicators, RCA outputs, soft turn-on circuit, remote turn on/off
- Power - 100 Max x 2 @ 2 Ohms, 50 Max x 2 @ 4 Ohms
- Full Range - With a Full Range amplifier you not only have the option to run your speakers, but also your subwoofers
- Low & High Level Inputs - A low level (RCA) input is measured in voltages. A high level (+/- wire) input is measured in wattages. Both essentially carry signal from your receiver to your amplifier to your speakers
- Variable Input Gain Control - The gain control is not for adjusting volume. It simply adjusts the amount of signal that is coming from your receiver and going to your amplifier
- Class A/B Topology - Class โAโ amplifiers have enormous amount of current flowing through its output transistors with no audio signal. Class โBโ amplifiers have no current flowing through its outputs with no audio signal
- 4 Channel, strong power dynamic voice restores high degree of sound.
- Aluminium alloy drawing process, slim design, easy to install.
- Great heat dissipation performance, safe and stable.
- Energetic, strong power, easy to promote sub woofer. Nondestructive amplifier installation, 360ยฐround sound.
- Provides you a wonderful in-car entertainment.
- ใYour Daily Commute De-StresserใTransform your daily drive from a stressful chore into your favorite part of the day. This amplifier delivers thunderous, clean power (170W RMS x 4 @ 2ฮฉ, <1.5% THD) with dual bridged channels outputting 340W. Easily powers demanding speakers and subwoofers for an immersive. Feel the bass in your chest and hear every detail for an immersive, high-fidelity audio experience.
- ใStudio-Quality SoundใEngineered with Class AB circuitry and a >90dB signal-to-noise ratio, this amp eliminates distortion and background fuzz. Whether itโs the punch of hip-hop or the subtle layers of jazz, you get rich, accurate sound reproduction that makes every song feel like a live performance.
- ใBuilt for Durability & Safe OperationใThe sturdy aluminum housing promotes optimal heat dissipation, while dual 25A fuses and integrated protection circuitry guard against short-circuit, overload, and thermal issuesโkeeping your system running reliably. So you can enjoy the beat without worrying about overheating or shutdowns.
- ใStraightforward Installation in Most VehiclesใDesigned with universal compatibility and clearly marked connectionsโincluding power, ground, remote, and RCA inputsโfor a tool-free setup process that works with nearly all car audio systems.
- ใProtection Mode Noteใ Automatic protection may activate due to input wiring issues or voltage instability (e.g., if the remote wire is not connected to the head unit, or if voltage fluctuates when opening the car door). To resolve, disconnect the power and reconnect the three main wiresโprotection should release automatically. If the issue persists, replace the input wiring.
Last update on 2026-06-12 / Affiliate links / Images from Amazon Product Advertising API
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SEOCONTENT-START
Bulletin Number: 15-240-19R; Revised: 06/29/23 Page 1 of 5 SERVICE BULLETIN ATTENTION: GENERAL MANAGER q PARTS MANAGER q CLAIMS PERSONNEL q SERVICE MANAGER q IMPORTANT – All Service Personnel Should Read and Initial in the boxes provided, right. ยฉ2019 Subaru of America, Inc. All rights reserved. Continued… NUMBER: 15-240-19R DATE: 04/18/19 REVISED: 06/29/23 APPLICABILITY: 2018-22MY Legacy and Outback 2018-23MY Crosstrek 2017-23MY Impreza 2019-23MY Forester 2019-22MY Ascent SUBJECT: New Harman Audio Amplifiers CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS. Subaru Service Bulletins are intended for use by professional technicians ONLY. They are written to inform those technicians of conditions that may occur in some vehicles, or to provide information that could assist in the proper servicing of the vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do the job correctly and safely. If a condition is described, DO NOT assume that this Service Bulletin applies to your vehicle, or that your vehicle will have that condition. Subaru of America, Inc. is ISO 14001 Compliant ISO 14001 is the international standard for excellence in Environmental Management Systems. Please recycle or dispose of automotive products in a manner that is friendly to our environment and in accordance with all local, state and federal laws and regulations. INTRODUCTION: This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing the following customer concerns: Symptom 1: No audio output is heard but, the volume level displayed changes when turning the knob Symptom 2: Audio volume increases to maximum intermittently without turning the knob Symptom 3: A buzzing, screeching or crackling-type sound is heard coming through the speakers Symptom 4: Loss of audio output after turning the head unit off and back on again in a short amount of time Symptom 5: Audio volume is temporarily louder than expected after ending a Bluetooth call while using navigation guidance Symptom 6: No response from the volume control knob. Symptom 7: The system unintentionally enters a reprogramming mode and stops audio function resulting in no audio output. This failure can be temporarily cleared by disconnecting and reconnecting the battery. Bulletin Number: 15-240-19R; Revised: 06/29/23 Page 2 of 5 Continued… PART INFORMATION: Description Exchange Part Number Application Power Amplifier Assembly 86221AL01G Legacy / Outback 2018-19MY 86221AN01C Legacy / Outback 2020-21MY 86221AN11B Legacy / Outback 2022MY 86221FL00G Impreza models with Cloth upholstery 86221FL01G Impreza models with Leather upholstery 86221FL016 Crosstrek 86221SJ004 Forester models with Cloth upholstery 86221SJ014 Forester models with Leather upholstery 86221XC01E Ascent NOTE: When ordering the applicable exchange amplifiers from United Radio, the exchange units supplied will contain all the latest available enhancements to address the symptoms as listed on pg. 1 of this bulletin. SERVICE PROCEDURE: The causes of Symptoms 1, 2, 4, 5, 6 and 7 are software concerns where in some cases, the amplifier status is not judged properly by the head unit. As a result, volume output is either muted (no output) or at the maximum. Please refer to Appendix section for troubleshooting reference with โNo Soundโ concerns. The cause of Symptom 3 is a hardware concern within the amplifier circuitry which also requires the unit be replaced with an exchange unit. Follow the procedure below to confirm this condition BEFORE ordering an exchange amplifier. 1. Enter the vehicle and turn the ignition ON. 2. Turn the audio unit on and listen for any unusual sounds from any of the speakers. 3. Pull the hood release lever. 4. Open the Driverโs window fully to retain access to the inside of the vehicle. 5. Turn the ignition OFF. 6. Exit the vehicle and close all the doors. 7. Wait at least 2 minutes before proceeding further. 8. Open the hood and remove the PDI (backup power) fuse. 9. Turn the ignition back on and listen again for any unusual sound from any of the speakers. 10. If the unusual sounds heard originally can no longer be verified, replace the amplifier with an exchange unit. If unusual sounds persist while the fuse is removed, there is another cause which will require further diagnosis. After confirming the symptom(s) as outlined in the Introduction above exists, order the applicable replacement amplifier following the Audio Exchange Program instructions. Install the exchange unit following the current Service Manual procedure. REMINDER: The exchange units supplied will contain all the latest available enhancements to address the symptoms as listed on pg. 1 of this bulletin. All exchange amplifiers have the new software and circuitry installed. Bulletin Number: 15-240-19R; Revised: 06/29/23 Page 3 of 5 ADDITIONAL INFORMATION: REMINDER: Customer satisfaction and retention starts with performing quality repairs. After the customer concern has been confirmed, the service procedure for replacing the power amplifier assembly remains unchanged. Always refer to the applicable Service Manual and review the full requirements of the repair being performed. The Service Manual procedures contain information critical to performing an effective repair the first time and every time. WARRANTY / CLAIM INFORMATION: For vehicles within the Basic New Car Limited Warranty period or covered by an active Subaru Added Security Gold plan, this repair may be submitted using the following claim information: Labor Description Labor Operation # Applicability Fail Code Labor Time HK POWER AMPLIFIER EXCHANGE B850-815 Ascent Legacy & Outback Crosstrek Impreza Forester ZSE-43 0.3 AUDIO SYSTEM TESTING AND DIAGNOSIS C031-001 All 0.3 NOTES: โข HK Exchange Units require the Exchange Number be shown as Misc. Detail. โข Power amplifier exchange replacements require the entry of an exchange part number on the claim. An โEXโ added to the end of the part number being installed will identify it as an exchanged part. (EXAMPLE: 86221AL01DEX) IMPORTANT REMINDERS: โข SOA strongly discourages the printing and/or local storage of service information as previously released information and electronic publications may be updated at any time. โข Always check for any open recalls or campaigns anytime a vehicle is in for servicing. โข Always refer to STIS for the latest service information before performing any repairs. Continued… Bulletin Number: 15-240-19R; Revised: 06/29/23 Page 4 of 5 Appendix โNo Audioโ Troubleshooting – Sound does not come out from the speaker(s) Please Note: Please check the following three points regardless of the results of the defect diagnosis. 1) If โNo Soundโ is recovered during diagnosis, please specify the condition. (e.g., Remove power, ACC OFFโON, etc.) 2) Please check the part number of the AMP, and if the part number is old, replace it with the latest part number. 3) Please make sure you can hear any beep. (On the head unit go to SettingsโSoundโBeep sounds, turn on BEEP feature ) 4) If this is a repeat occurrence for โNo Soundโ (a previous visit fixed โNo Soundโ during diagnosis or with a replacement part), please report via QMR 1. Check Audio/Volume Perform the instructed procedures 1. Check Audio/Volume (Visual Inspection) a. Turn ignition ON b. Check if the volume widget is shown on the head unit while rotating volume knob Is the Volume widget shown when rotating the Volume knob; YES: Go to 2. NO: Diagnose for Head Unit (Reference โRadio Malfunctionโ troubleshooting flow chart) Perform the instructed procedures 4. Check mute mode a. Turn the ignition switch OFF โ ON b. Read the DTC of [Infortainment] using the Subaru Select Monitor Is DTC B2244 displayed? (Current malfunction) YES: Perform the diagnosis for the displayed DTC B2244 NO: Go to 5. 2. Check mute mode Perform the instructed procedures 2. Check mute mode Check if mute mode is turned on when the mute button is pressed. Is the Volume widget shown when rotating the Volume knob; YES: If there is still no sound after Unmute, proceed to 3. NO: Diagnose the head unit (refer to the troubleshooting flowchart under โRadio Malfunctionโ) Perform the instructed procedures 3. Check DTC (model with Telematics) Read the DTC of [Telematics] using the Subaru Select Monitor. Are any of these DTCโs set as current? B2A0E (mute line circuit) B2A05 (left speaker/audio circuit) / B2A06 (right speaker/audio circuit) YES: Perform the diagnosis for the current displayed DTCs. NO: Go to 4. 3. Check DTC (model with Telematics) 4. Check DTC YES YES NO NO YES NO YES NO Continued… Bulletin Number: 15-240-19R; Revised: 06/29/23 Page 5 of 5 Perform the instructed procedures 5. Check the mode in which no sound comes out Check if sound comes out in each mode such as CD, radio, etc. Does it have no sound in all modes? YES: Go to 6. NO: Please perform fault diagnosis for each mode with no sound. CD: DISC error or HU error. (If the CD DECK is a separate unit, check the CD DECK as well.) Radio: Antenna error, radio wave environment factor, or HU error. Bluetooth Audio: Pairing is not completed or HU error. USB: USB device error or HU error. HF: Pairing is incomplete or HU error. VR( Native): HU error. In case of HU error, please go to HU diagnosis of each source. Perform the instructed procedures 6. Check diagnostic mode Perform {Audio Check} on the {Line Diag} screen. Does it have no sound in all speakers? YES: Go to 7. NO: Model with power amplifier: Check the harnesses between the unit and power amplifier; and between power amplifier and speaker for open circuit or short circuit. If no fault is found, replace the speaker. Model without power amplifier: Check the harness between the head unit and speaker for open circuit or short circuit. If no fault is found, replace the speaker. 5. Check the mode in which no sound comes out 6. Check diagnostic mode Perform the instructed procedures 7. Check wiring harness a. For models with an amplifier, check for poor contact in the amplifier b. Without an amp, check for poor contact in the connector of the head unit and the connector of each speaker. Is the check result OK? YES: Go to 8. NO: Repair or replace the affected harness 7. Check connectors Perform the instructed procedures 8. Check amplifier Refer to the TSB and check to see that the amp is the latest part number. โ see TSB 15-240-19R Is the amplifier latest part number? NO: Replace amplifier with an exchange to get one with the latest software. YES: Unplug both connectors from amp to remove power, then plug both back in to reset amp. Either: a) The โno audioโ issue is resolved: Issue is based in amplifier software. – because the amp is the latest part number, replacement will not correct it. Amp must be reset with a power cycle. b) There is still โno audioโ: The issue is likely hardware-related, either amp or head unit. – replace amp first; if issue persists, replace head unit. 8. Replace Amplifier (or Head Unit) NO NO YES YES NO YES NO
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