2019-2021 Subaru Ascent Harman Kardon Amplifier: No Sound Problems and Replacement Guide

Known Issues and Symptoms of Failure

The most common symptom of a failing audio amplifier in the 2019-2021 Subaru Ascent is a sudden and complete loss of all audio. This includes sound from the radio, Bluetooth, Apple CarPlay/Android Auto, and navigation voice prompts. The infotainment screen will often continue to operate normally, showing song titles and navigation maps, but no sound will come from any of the speakers.

• Complete loss of audio: The most prevalent issue where all sound ceases, though the head unit appears to be working.
• Intermittent audio: Sound may cut in and out randomly.
• Popping or cracking noises: Loud, unpleasant sounds from the speakers, which can occur even when the audio system is at a low volume.
• Distorted sound: Audio may sound garbled or fuzzy from one or more speakers.
• No response from volume control: In some cases, the system may get stuck at one volume level or not respond to the volume knob at all.

Many owners report that these issues can sometimes be temporarily resolved by rebooting the system. This can be done by disconnecting the car's battery for a few minutes, pulling the specific audio fuse in the under-hood fuse box, or simply unplugging the amplifier itself, which is located under the front passenger seat. If these resets only provide a temporary fix or do not work at all, it often points to a permanent hardware failure within the amplifier.

Related Technical Service Bulletins (TSBs)

Subaru has issued service bulletins related to the Harman Kardon audio systems that can help diagnose issues. While not a recall, a TSB provides dealers with official procedures for addressing known problems.

• TSB 15-240-19R: This bulletin announces the availability of new Harman audio amplifiers with revised internal logic to address several symptoms, including no audio output or getting stuck in a reprogramming mode. This indicates Subaru is aware of hardware issues and has released updated parts.
• TSB 15-231-18R: Provides detailed troubleshooting steps for various audio-related concerns, including no sound. It guides technicians to check connections and swap the amplifier first when diagnosing a total loss of audio.

Diagnosing a Faulty Amplifier

If you are experiencing a total loss of sound, follow these steps to narrow down the cause:

1. Check Fuses: Before assuming the amplifier has failed, check the audio-related fuses. There is a fuse for the audio system in the fuse box located under the hood. Consult your owner's manual for the exact location and rating.
2. Reboot the System: Try a hard reset. You can do this by holding the radio's power/volume knob down 🎬 Watch this quick video on resetting your Subaru Ascent radio for 10-20 seconds until the Starlink screen reboots. If that doesn't work, disconnect the negative terminal of your car's battery for about 15 minutes. This forces all electronic modules, including the amplifier, to restart. If sound returns, the issue may be a software glitch in the head unit or amplifier. If the problem reoccurs frequently, the amplifier is likely failing.
3. Check Amplifier Connections: The amplifier is located under the front passenger seat. Ensure the electrical connectors are fully seated and show no signs of corrosion or damage. Spills on the floor can sometimes lead to water intrusion and damage the unit. Unplugging and replugging the connectors can also serve as a targeted reset.
4. Listen for Any Sound: Turn the volume up high and listen carefully for any faint hissing, popping, or buzzing from the speakers. Any sound at all, even if it's just noise, indicates the amplifier is receiving power but is failing internally. Complete silence is more ambiguous and could mean a power failure, a connection issue, or a dead amplifier.

Buying a Used Audio Amplifier

Purchasing a used OEM amplifier is a cost-effective way to restore your sound system. Because this is a complex electronic module, there are several critical factors to consider.

• Verify the Part Number: The most important step is to match the part number. The OEM part numbers for this amplifier have been superseded over time, with newer versions offering improved reliability. The known part numbers are 86221XC01A, 86221XC01B, 86221XC01C, 86221XC01D, and 86221XC01E. It is highly recommended to purchase the latest version available, 86221XC01E, as it replaces all previous versions and contains the most recent hardware and software updates.
• Physical Inspection: When buying a used part, inspect it for signs of damage. Look for corrosion on the aluminum casing or inside the connector pins, which indicates water damage. Check for dents or cracks from a vehicle collision. Avoid any units with broken mounting tabs or tampered-with seals.
• Source and Warranty: Buy from a reputable auto recycler that offers a warranty. A warranty provides protection in case the used part is also faulty.
• Factor in Programming Costs: A used amplifier will not work by simply plugging it in. It must be programmed by a Subaru dealer to sync with your vehicle's VIN. This is a necessary anti-theft and configuration measure. You must factor the cost of this dealer service into the total price of the repair.

Programming and Installation

Physically replacing the amplifier is a straightforward job, but the final programming step is essential.

Replacement Steps

1. Disconnect the Battery: Disconnect the negative terminal from your vehicle's 12V battery to prevent electrical damage.
2. Access the Amplifier: The amplifier is located under the front passenger seat. You will likely need to unbolt the seat from the floor and carefully tilt it backward to gain access.
3. Remove the Old Unit: Disconnect the electrical harnesses from the amplifier. Then, unbolt the amplifier from its mounting bracket.
🎬 See how to access and remove the amplifier under the seat
4. Install the New Unit: Bolt the replacement amplifier into place and securely reconnect the electrical harnesses.
5. Reassemble and Reconnect: Bolt the passenger seat back into place and reconnect the battery.

Required Dealer Programming

Cost Comparison

The cost of replacing the Harman Kardon amplifier can vary significantly depending on the source of the part.

Frequently Asked Questions