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Old 01-01-2010, 05:19 AM   #1 (permalink)
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Default High pitched tone under hood when car is off

This just started yesterday. Got home after a day of driving, pulled into garage, turned car off and we could hear a high pitched tone coming from the front of the car. Sounds like a whistle. Opened the hood, didnt seen anything. Noticed the sound was loudest when I put my ear down in front of the grill by the subaru emblem on the front of the car. Any ideas what this is? I have seen posts suggesting vacuum hose, but those posters said their car was running. We don't hear this when the car is running,, but maybe because the sound of the engine is too loud. The only way to stop the tone last night after it went on for a couple hours, was to disconnect the battery. Figured it would only run down the battery if left on. Any help is appreciated. It's an 05 Forester. Thanks.

Last edited by cardmaker; 01-01-2010 at 05:21 AM. Reason: forgot make of car
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Old 01-01-2010, 06:47 AM   #2 (permalink)
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First welcome to the Forum, we hope you stick around and enjoy the shared knowledge we have learned and hope you participate at some point.
Lot's of good reading if you use the Search* function.

The sound you are most likely hearing is the keyless buzzer (chirp) that makes a sound when you lock/unlock the doors with the remote, unless that function has been turned off.

Over time corrosion takes it's toll on the part and you'll hear a high pitched tone or whistle as you describe from the front of the car. The buzzer is located on the radiator support behind the front grill. Not sure if you'll be able to reach it without taking the grille out. You'll see a wiring harness going to the part (hard to describe), the buzzer/ chirper (enclosed unit) can either be disconnected or taken off and clean the terminals before reinstalling. According to my Subaru mechanic this happen a lot especially in the colder months, so moisture and corrosion may be the culprit.
* I knew this had been covered before but when I went to use the Search, I kept getting a message that I hadn't enough words in the search (even though I had more than required). Even the site has issues sometimes.

That hopefully will solve your mystery whistle.

If you do decide to participate on the forum you can add your vehicle info to your Signature. Just go into your User CP,Edit Signature and add vehicle info such as year/model/transmission. That way it will show up every time you post.
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Last edited by good dog; 01-01-2010 at 06:54 AM.
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Old 01-01-2010, 08:38 AM   #3 (permalink)
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Hissing (or squeeling, whistling) noise from new Forester

hello! (and help!)
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Old 01-01-2010, 08:52 AM   #4 (permalink)
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http://www.scoobymods.com/high_pitch...nt-t10447.html
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Old 01-01-2010, 09:35 AM   #5 (permalink)
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lol had this happen to me yesterday. Its the chirper for the keyless entry that beeps when you lock/unlock. Its right on the center radiator support behind the vertical pillar in the grill. A little round plastic deal with a plug on it. Undo the plug and put some dielectric grease in there to keep it water tight.
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Old 01-02-2010, 09:11 AM   #6 (permalink)
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Hmmmmm....this sounds like a very high pitched sound that I used to hear from my '03 after the engine was shut off....I also had to hold my head right at the grill to hear it and thought it was just my getting older and listening to too many Hendrix/Journey/Slade albums at full tilt........

Never found out what it is/was but it sounded more like a pressurized hose somewhere near the radiator releasing the PSI as the engine cooled back off......

I don't hear it these days but I'm 5 years older and just haven't heard it anymore......"help, help, I've fallen and I can't get up!".........ha ha ha.......

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Old 01-02-2010, 10:27 AM   #7 (permalink)
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Is that noise? I've been wondering about it for the past year and a half. LOL!
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Old 01-02-2010, 10:45 AM   #8 (permalink)
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Quote:
Originally Posted by toysbyus View Post
Hmmmmm....this sounds like a very high pitched sound that I used to hear from my '03 after the engine was shut off....I also had to hold my head right at the grill to hear it and thought it was just my getting older and listening to too many Hendrix/Journey/Slade albums at full tilt........

Never found out what it is/was but it sounded more like a pressurized hose somewhere near the radiator releasing the PSI as the engine cooled back off......

I don't hear it these days but I'm 5 years older and just haven't heard it anymore......"help, help, I've fallen and I can't get up!".........ha ha ha.......

Steve
Yep thats exactly the sound. I have mine unplugged now until i get some dielectric grease.
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Old 01-02-2010, 11:08 AM   #9 (permalink)
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To clarify: the sound was almost like the whine that a mosquito makes when it buzzes around your head, so faint and high pitched........it was NOT the key chirp emitter, no way.

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Old 01-02-2010, 03:55 PM   #10 (permalink)
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Check your drive by wire servo on the throttle body.
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Old 01-02-2010, 04:02 PM   #11 (permalink)
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As others said, It's likely the piezo chirper for your alarm. Odds are, the noise will go away when outside temps come up. Unplug the little bugger and if the noise disappears then you've found the culprit. Then put in the dielectric grease as suggested.
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Old 01-03-2010, 08:30 AM   #12 (permalink)
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Success! It was the chirper. My husband took it out, dried it and sealed it and put it back in. The noise is gone. Thanks for the post with the photos, made it much easier. Now, the only problem is, the bottom clip that the grill slides on to broke. It looks like 'the buckhorn site on a rifle' which is how my husband describes it. It slides up on the grill. Anyone know of a cheap place to get one rather than a dealer?? Thanks for all your help.
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Old 02-04-2011, 09:16 PM   #13 (permalink)
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Had the same problem today on my 2004 Forester. It's been cold and icy, and today it got warmer and wetter. I couldn't figure out how to unplug the Piezo, but when I wiggled it the pitch changed. I used a hair dryer to dry it out and it stopped ringing. Hopefully the sound doesn't come back, thanks for saving me a trip to mechanic, I hope.
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Old 12-15-2013, 07:36 AM   #14 (permalink)
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Very happy to find this thread, it was bugging the hell out of me while shoveling.
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Old 12-15-2013, 08:00 AM   #15 (permalink)
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Just fell onto this thread again after 3 years….is THAT what the sound is? No wonder my noise seems to have faded away over the years………a hose releasing pressure would have kept going and possibly gotten worse…..

Of course, I AM 3-4 years older now so perhaps the sound is still there but my hearing hasn't gotten sharper???
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