2018-2019 Honda Odyssey LX Active Noise Cancellation Module: Diagnosis and Replacement

Symptoms of a Failing Active Noise Cancellation Module

The most common symptom of a problem with the Active Noise Cancellation system is a persistent and annoying sound coming from the speakers. This can occur even when the audio system is turned off.

• Booming, Humming, or Droning Noise: A low-frequency booming or humming sound that comes through the speakers is a primary indicator of a fault within the ANC system. This could be caused by a failing module or a problem with one of the ANC microphones.
• Erratic Buzzing with Aftermarket Subwoofer: If you have installed an aftermarket subwoofer, a faulty or active ANC module can create a feedback loop. The module detects the subwoofer's bass as noise it needs to cancel, resulting in a strange, escalating buzzing sound.

Diagnosing the Problem

If you suspect the ANC module is causing unwanted noise, the easiest diagnostic test is to temporarily disable it. Since the module is a standalone unit, simply unplugging it will stop it from functioning.

1. Locate the ANC module, which is found behind the glove box.
2. Disconnect the electrical connector from the module.
3. Drive the vehicle to see if the booming or humming noise is gone.

If the noise disappears, the ANC module or one of its microphones is almost certainly the cause. If the noise remains, the problem lies elsewhere in the audio system.

Known Issues, TSBs, and Recalls

There are no active recalls for the Active Noise Cancellation module (part number 39200-THR-A01) on the 2018-2019 Honda Odyssey LX.

However, Honda has issued Technical Service Bulletins (TSBs) for similar systems on other models that provide useful context:

• Honda TSB 21-053: Issued for the Accord Hybrid, this bulletin addresses a booming or humming noise caused by outdated software in the ANC unit, with the prescribed fix being to replace the module.
• Honda TSB for Accord/Insight: This bulletin notes that booming or rumbling sounds can be caused by damaged insulating foam on the ANC microphones in the headliner. Before replacing the module, it may be worth visually inspecting the microphone covers in the headliner for any obvious damage.

Buying a Used 2018-2019 Odyssey ANC Module

A used OEM module is a reliable and cost-effective solution. Since new aftermarket versions are not commonly available, a recycled part from a reputable seller is often the best choice.

What to Check Before You Buy:

• Verify the Part Number: The number printed on your original module must be 39200-THR-A01. The alternate number 39200THRA011 may also be used. Always match this number exactly.
• Inspect the Connectors: Check the pins in the electrical connector port on the used module. They should be clean, straight, and free of any green or white corrosion.
• Look for Physical Damage: Ensure the plastic casing is not cracked or broken. While unlikely, this could indicate internal damage from an impact.

Programming and Installation

The Active Noise Cancellation module on the 2018-2019 Odyssey LX is considered a plug-and-play part. No special programming or dealer visit is required for it to function after installation. The system will operate correctly as soon as it is plugged in.

Replacement Overview

The module is located behind the glove box on the passenger side of the dashboard. Replacement is straightforward and can be performed by a DIY mechanic with basic tools.

1. Empty the glove box.
2. Release the glove box stops to let it hang down fully, providing access to the area behind it.
3. Remove any trim panels necessary to get a clear view of the module.
4. The ANC module is a small silver or gray box. Disconnect the single electrical connector.
5. Unbolt or unclip the module from its mounting bracket.
6. Install the replacement module and reconnect the electrical harness.
7. Test for proper function before reassembling the glove box and trim.

Cost Comparison

Frequently Asked Questions (FAQ)