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Honda Accord Hybrid Harmonic Drone/Noise Suppression

124

Comments

  • jbo3jbo3 Posts: 5
    The growling noise is sometimes referred to as a harmonic drone. I have a 2005 HAH and I had the same trouble. The hybrid engine makes the noise when it shut down 3 of the cylinders. The noise originates from the exhaust headers. When 3 cylinders shut down, the headers become untuned and the noise is generated. The engineers at Honda are aware of the problem and countered the noise issue with an Active Noise Cancellation (ANC) system. The ANC works using the audio system in the car by creating a 50 Hz sound exactly 180 degrees out of phase with the header sound effectively cancelling out the untuned header noise. The noise is still there but you won't hear it.

    Most dealerships are unaware of the issue or the fix. Your ANC is probably turned off. The fix is to reset the ANC to the on setting. To do this press and hold the on switch on the radio and press and hold the tuning switch at the same time. Look in the heads up display for ANC Then while the two switches are held down, press the scan button. You should see ANC ON or ANC OFF. By pressing the scan button repeatedly the display will toggle between ANC on and off.

    This procedure fixed my harmonic drone but if you turn on the ANC and the sound doesn't stop, your ANC may need to be replaced. That'll cost you because the stereo speakers and the ANC are matched. Good luck.
  • That is exactly what it was-although it couldn't be fixed with the radio thing. I had to have it all replaced-ANC and speakers. The dealer wanted almost $800 to do it, so I had a private garage fix it for $500. It completely solved the problem-although I think Honda should have paid for it and not me.
  • That is exactly what it was-although it couldn't be fixed with the radio thing. I had to have it all replaced-ANC and speakers. The dealer wanted almost $800 to do it, so I had a private garage fix it for $500. It completely solved the problem-although I think Honda should have paid for it and not me.
  • That is exactly what it was-although it couldn't be fixed with the radio thing. I had to have it all replaced-ANC and speakers. The dealer wanted almost $800 to do it, so I had a private garage fix it for $500. It completely solved the problem-although I think Honda should have paid for it and not me.
  • I had this problem. Thank heavens for this website!!!! I took the car to Honda, told them what the problem was, had the service page with me. They test-drove it; insisted on doing an engine test ($50); test-drove it again. Somewhere in there, the mechanic, maybe just to shut me up, disconnected the ANC kit and the problem was over. They wanted to charge me $170, I guess for the time they spent test-driving it. I refused to pay anything but the $50,since I TOLD THEM what the problem was when I brought the car in.
  • Wow... I'm brand new on this forum and joined first and foremost to solve my 2005 HAH ANC issue. jbo3... are you doing this ANC on/off thing on a factory stereo with or without Nav? I tried it on my non-navigation radio and I can't seem to get access to the ANC screen you speak of. I started with car on, radio off, then multiple variations thereof :). Any suggestions? I'm dying to get this fixed as the car I once loved driving has now turned into a torture chamber.

    Many many thanks!
  • Dear lbrown53:

    I have 1 2005 Honda Accord Hybrid with this same problem. The dealership wants $100. to diagnose. Even though I already told him what the problem was. Can you lead me to the service page so that I can take with me also? I searched google for the Honda service page and your reply was what came up. I really believe Honda should pay for these problems, but......when your ANC kit was disconnected did it disable your radio or anything else? Do you know where the ANC kit connection is located? Any help you can give me is appreciated.

    Thank you
    scwand51
  • Hi -- What a nerve, asking $100 to diagnose the problem when you are telling them what it is!!! If you read back through all the emails on this, you'll find the number of the service bulletin. I know the part is #06390-sdr-307 "noise kit" . I just had mine disconnected, and that solved it. You (as the main driver) will probably still notice something at 1500 rpms, but you can live with it. The radio works fine.... I guess they aren't connected. It's pretty crummy that Honda won't do a recall on this, as every single Honda '05 hybrid must have this problem! Are you by any chance in the Charleston, SC area? If you are, I have not been happy with one of the dealers; the other was better but not by much, really.
  • I have the same problem everyone is complaining about and I'm out of warranty. I'm not trying to pay $500 to fix this faulty part. The service Bulletin about this problem that was put out in March 2006 states that repair performed after warranty expiration may be eligible for goodwill consideration by the District Pars and Service Manager or your Zone office. That would equate to just me paying for the labor and not the part. Probably like $100 - $200.

    I tried doing the reset option that jbo3 mentioned but it didn't work for me. I have the Nav system and didn't see any type of display when I pushed down the power button and tuner buttons at the same time. jbo3 are you playing us?!!

    I'm thinking of ordering the part and doing it myself. There's a dude that made a YouTube video showing how to do it. He claimed to get the part for $262. Its more than I want to or think I should pay but its better than $500.

    art 1
    http://www.youtube.com/watch?v=w6IKK-C1-QQ

    Part 2
    http://www.youtube.com/watch?v=T8ouA_fcIRY&NR=1

    Part 3
    http://www.youtube.com/watch?v=KZHM2...eature=related
  • jbo3jbo3 Posts: 5
    This is a reprint of the correct way to reset your (ANC) Active Noise Cancellation systemon a Honda Accord with and without a navigation system. My apologies pro posting the incorrect procedure the first time. #97.

    Harmonic drone accord hybrid by rhj88

    Sep 17, 2005 (5:14 pm)
    If your harmonic drone sound is most apparent between 1500 and 1700 RPM try this.
    1. Accord Hybrids with Navigations system: Turn the ignition switch to ACC (1) or ON (II)
    2. Turn the Audio Unit off. (Radio on and Off button, push to off)
    3. While holding down the upper part of both the "CH/DISK" and "SEEK/SKIP" buttons simultaneously, press the VOL/Pwr knob.
    This will place it in Diagnostic mode...DIAG will appear in the upper window above the Nav unit.
    Now while the engine is stopped and while in DIAG mode, turn the ANC ON and OFF by pressing the SCAN Button, you may have to push SCAN button ON and Off a couple times... While in the OFF mode, This will be displayed in the upper window above the Nav unit..... a low frequency hum (50HZ should be heard. While this low frequency tone is sounding turn the engine on and the sound should go away. IF it does your ANC is working and now is reset to the on position automatically. Now drive your car and see if the low frequency drone is gone!

    If you do not have the NAV unit follow this procedure.
    1. Turn the ignition switch to ACC (1) or ON (11)
    2. Turn the audio unit ON.
    3. While holding down both the "Preset1" and "Preset6" buttons simultaneously, press the AUDIO PWR knob.
    4. "DIAG" will appear on the audio unit display to indicate you have entered the self-diagnostic mode.

    NOW, while in Diag mode turn the ANC ON to OFF by pressing the #1 button, A LOW
    frequency hum (50HZ) should sound for up to a minute. While this low frequency HUM is Sounding turn the engine on and the HUM should GO AWAY. Now drive your car and see if the low frequency drone has gone away!

    There have been numerous cases where the ANC appears to toggle off all on its own.
    My car started this drone after only 250 miles since new and with NO luck with the dealership I purchased the shop manuals which describes the above diagnostic procedure. It worked for me. Do not change the order of events. Do exactly as printed.
  • jbo3jbo3 Posts: 5
    See number 106. Sorry about the incorrect procedure. I was working from memory and it's not as sharp as it used to be. Jbo3
  • jbo3jbo3 Posts: 5
    Thanks rhi88. It worked for me. I reposted it on #106. I hope it helps others.
  • Thanks for posting this! The ANC on my 2005 Accord Hybrid worked fine until recently. I recognized the problem just from having read my owner's manual about how the system works when the engine goes into 3-cylinder mode, but came to this site for validation and ideas for what to do about it. I'll try turning off the ANC system and see if that helps before spending a lot of money to fix it, but all the info on this page should help my mechanic (I don't use the dealership) if I decide to get it replaced.
  • soocitysuesoocitysue Posts: 16
    I am SO ANGRY that Honda denies this problem and doesn't do a recall on it. Honda is such a great company, with a great reputation that the administration has tried its best to destroy. They should jump at the chance to fix these. At the very least, they should disconnect the thing. That's what I had done, but I can tell you, you will know every time your car idles at 1500 rpms... which is all the time. It is still annoying.

    There is a procedure you can try; did you find that in these postings? Good luck! And I'm glad my info helped someone.
  • ghchawaiighchawaii Posts: 1
    edited February 2012
    This seems to work very well, but it's only short term because the device seems to reset and turn back on when the engine goes off. It's easy enough to do over and over, but the buzz for the 60-90 sec can drive you nuts.

    I found a more permanent fix. The link is http://www.justanswer.com/honda/1bymn-causes-motorboat-noise-2005-honda-accord-h- - - ybrid.html. I think this fix is basically doing a permanent grounding from the dome light to the chasis which is the dealers' test procedure.

    It took me a couple hours, mostly to figure out what I was looking at. I can summarize it here and it should only take about 30 min. Start by getting to the fuse box at the driver's left leg. In order to see, there is a flexible black plastic piece that has to be removed; the end by the engine side is easy. The end at the dash requires that the lower driver's side dash be loosened. To loosen the dash, there is a single Philips screw on the left and a clip on the right that goes into a metal bracket. The clip has to be squeezed then pushed through the bracket. The rest of the dash piece can be pulled away. Once the dash is loose, the flexible black piece can be popped. There are 3 white plastic clips that I pushed with a flat screw driver and pushed down.

    Right above the fuse box are several wire harnesses and pin block connectors. There is a large brown and a large white pin block connector; these have to be unmounted by slipping a flat screw driver into the tab and pulling the whole block down. After these are off the mount, push them upward to see well.
    The very top pin connector is a "8 pin"... It's actually a 10 pin connector, but two are not used. The far left top wire (1) is green and red; THAT IS THE ONE YOU WANT. To be sure you are on the right wire, count from the green-red; there are two open slots, then 2 more on the top row. The next row goes orange, yellow, black, yellow, yellow. The black is the 6th wire and is a ground.
    Back to the all important green and red wire. Cut that wire free then ground the wire some place to the chasis. I first "tapped" into the wire and grounded it; the noise went away, but the dome light stays on with the switch in the "door" position. After I cut it loose, the dome light works correctly and the noise is still gone.

    It cost me about $10 at Radio Shack for wire and a connector to splice in. Sure is a lot better than $400 to the dealer
  • leftmid7leftmid7 Posts: 1
    If your harmonic drone sound is most apparent between 1500 and 1700 RPM try this.
    1. Accord Hybrids with Navigations system: Turn the ignition switch to ACC (1) or ON (II)
    2. Turn the Audio Unit off. (Radio on and Off button, push to off)
    3. While holding down the upper part of both the "CH/DISK" and "SEEK/SKIP" buttons simultaneously, press the VOL/Pwr knob.
    This will place it in Diagnostic mode...DIAG will appear in the upper window above the Nav unit.
    Now while the engine is stopped and while in DIAG mode, turn the ANC ON and OFF by pressing the SCAN Button, you may have to push SCAN button ON and Off a couple times... While in the OFF mode, This will be displayed in the upper window above the Nav unit..... a low frequency hum (50HZ should be heard. While this low frequency tone is sounding turn the engine on and the sound should go away. IF it does your ANC is working and now is reset to the on position automatically. Now drive your car and see if the low frequency drone is gone!

    If you do not have the NAV unit follow this procedure.
    1. Turn the ignition switch to ACC (1) or ON (11)
    2. Turn the audio unit ON.
    3. While holding down both the "Preset1" and "Preset6" buttons simultaneously, press the AUDIO PWR knob.
    4. "DIAG" will appear on the audio unit display to indicate you have entered the self-diagnostic mode.

    NOW, while in Diag mode turn the ANC ON to OFF by pressing the #1 button, A LOW
    frequency hum (50HZ) should sound for up to a minute. While this low frequency HUM is Sounding turn the engine on and the HUM should GO AWAY. Now drive your car and see if the low frequency drone has gone away!

    There have been numerous cases where the ANC appears to toggle off all on its own.
  • Last week I had a new ANC system installed in my 2005 Hybrid Accord. The car runs much quieter now BUT I get this unbearable ear popping/pressure feeling every time I turn on the engine. I feel like I'm under 20 feet of water. There is no noise to hear. It's just an intensely uncomfortable feeling. The weird thing is that not everyone can feel it. The Honda mechanics couldn't feel it so they didn't know what to fix.
    Anyone have any ideas?
  • Last week I had a new ANC system installed in my 2005 Hybrid Accord. The car runs much quieter now BUT I get this unbearable ear popping/pressure feeling every time I turn on the engine. I feel like I'm under 20 feet of water. There is no noise to hear. It's just an intensely uncomfortable feeling. The weird thing is that not everyone can feel it. The Honda mechanics couldn't feel it so they didn't know what to fix.
    Any ideas?
  • ric9999ric9999 Posts: 1
    richking52, u still hear noise after replacing ANC??

    Can you shower some details on replacing ANC like cost , what were all replaced etc... thanks
  • Thank you so much for this post! The drone went away! I took off the panel that holds the tcs button which required me to remove one philips screw at the bottom left and grounded the green/red wire up high on a bolt that had another ground. It's out of the way and looks original. I didn't have to remove any of the connectors on the fuse block but just unplugged the gray 8-pin connector on top of the fuse block and cut and splice a longer wire in. Saved a bunch of money! Cost to repair: $0 (had existing connectors)
  • gankhuyaggankhuyag Posts: 2
    if u have 2005, V6 Hybrid Accord, which is making some noise sounds like a booming or humming noise with some vibration, when decelerating or easing off on gas. Goes away when braking or accelerating again? Find 8 pin gray connector which is located behind of yellow connector, and cut the green/red wire. Then ground it to bolt securing hood release.

    here is the link you can fix your problem.

    http://www.youtube.com/watch?v=lnzQ7My--nk
  • If I follow the instruction for eliminating the Drone noise mentioned in #112 of 121 Re: Harmonic Drone Noise FIX [moosyw] by leftmid7 . will I be shutting off the Hybrid function of the car which could affect the gas mileage.
    Thanks for any help you can give me in this matter.
  • I've noticed that my gas mileage has decreased around the time the Harmonic Drone noise started. Could this be the cause or could it be something else. Any help someone could give me would be very much appreciated.
    Thanks!
  • ovie3ovie3 Posts: 2
    Hope this is not too late,sorry but dont have same problem with my 2005 hybrid accord,am yet to change my ANC unit am still experiencing the humming and vibrations in my car through the speakers whether the stereo is on or off. could you please send me the details of where you had your ANC unit changed or where i get to buy the unit itself?also did u change your speakers? your reply will be so well appreciated.thanks
  • ovie3ovie3 Posts: 2
    could you please give me a step by step procedure on how to do this operation? i have the same problem and am still thinking of replacing the anc unit.i know this has been long hope to get your reply soonest.
  • I don't have the specific directions. I just took the car to the Honda Dealer in Kingman Arizona and they had the official procedure. It was covered under my Honda Care Policy. What they did was replace the ANC unit and both front door speakers. Once they did that I never heard the droning noise again, and I have put 50,000 miles on it since then. It did not effect the sound quality of the audio system. I absolutely love this car.
  • Hello there, I attempted this repair yesterday but it seemed to fail. Can you please clarify exactly which wire it is, my middle light remained on when i grounded the wire when it was on door open that is. But the sound still reamined, did I do something wrong?
  • One mechanic tried to make that work for an hour without success; another one had it work in 5 minutes. When I took it to Honda service, they kept suggesting all kinds of other things, and I finally said, just disconnect it, please. That's all I know.
  • giri1giri1 Posts: 1
    Hi could you please let me know exaclty which wire we need cut. I see two green/red wires in the 8 pin grey connector.
  • My car makes a noise like cymbals or a tamberine when driving at slow speeds (under 40 mph). It also happens when driving to the right. It does not happen when I drive to the left. I tested it by driving in circles both ways.
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