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Discussion Starter #1
Hello, I live in Brazil and I recently bought a Q3 model 2016, and I’m having a sound system noise issue. I asked on the dealer and they told me that it’s something normal on all Audi Q3 and A4 models.
When you have just switched off the ignition and the sound system is off or on the minimum volume, it’s possible to hear a constant “ziiiiiiiiiiiiiiiiiiii” coming from the loudspeakers. It’s specially audible on the twitter located up on the passengers door. It looks like a static interference. It’s no so loud, but clearly audible and a bit boring. And since I never heard this kind of interference in any other car I had before, I thought that there might be something wrong with that. The sound/noise lasts for about 2 minutes, and only stops when the car cuts all the power off after being disabled for this 2 minutes. If I switch the sound system on and off again, the noise starts over.


Has anyone noticed this yet? Thanks
 

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Hey there and welcome to the forum - hope we can answer this for you - I'll go check my own car and get back to you - but normally our cars in the US - if the stereo is on when we shut off the car, the radio stays on until the door is opened - this usually means that most folks are leaving the car and don't get the chance to hear this noise you're referring to -
 

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Update : my car is totally quiet on power off. I have a 2015 Prestige w/Bose and I tried the following :

Power off the car - turn down/then off - the radio - NO noise whatsoever (and I can hear very well) - I actually used a stethoscope...
Power off the car - wait for radio power down, about 10 minutes - NO noise ...
Open door - power off the car - this allows for the radio to be powered down immediately - also NO noise ...

Note : even with a power off the car, and immediate exit, there remain some systems (e.g. cooling fan depending on heat, evaporative control, etc.) that remain active for about 10 minutes - so it's possible that a few of these systems could be creating some cross-talk that gets to the smaller magnet driven speakers (like tweeters) - but frankly this would surprise me given Audi's pretty sophisticated CAN-Bus and wiring architecture and shielding. Perhaps the speaker wires are just not that important for this shielding and/or the S/N ratio is so much better with the power on.
 
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Update : my car is totally quiet on power off. I have a 2015 Prestige w/Bose and I tried the following :

Power off the car - turn down/then off - the radio - NO noise whatsoever (and I can hear very well) - I actually used a stethoscope...
Power off the car - wait for radio power down, about 10 minutes - NO noise ...
Open door - power off the car - this allows for the radio to be powered down immediately - also NO noise ...

Note : even with a power off the car, and immediate exit, there remain some systems (e.g. cooling fan depending on heat, evaporative control, etc.) that remain active for about 10 minutes - so it's possible that a few of these systems could be creating some cross-talk that gets to the smaller magnet driven speakers (like tweeters) - but frankly this would surprise me given Audi's pretty sophisticated CAN-Bus and wiring architecture and shielding. Perhaps the speaker wires are just not that important for this shielding and/or the S/N ratio is so much better with the power on.
That is great feedback and might help into factoring in what might warrant a check up at the dealer just to see if there's any way to eliminate that sound.
 

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Discussion Starter #5
Hi!


Thanks for the reply. My sound system is the non-bose Audi multimídia interface / radio concert.



Power off the car - turn down/then off - the radio - Noise for 2 minutes.

Open door - power off the car - this allows for the radio to be powered down immediately - noise for 2 minutes also.


With the engine on, volume down or off the radio, the noise is also there.


I think I´ll go to the dealer and ask to see that noise on another Q3 like mine.
 

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I know I'm replying this 5 months after the last message in the thread was entered; but am curious what the prognosis was.

I'll give my 2 cents anyways ...

In an after-market situation particularly when an amplifier is added to a system, that buzz sound would be reminiscent of a bad ground.

If this were me and it were an after-market situation, I'd go back to every power source and ensure the wiring sleeves are not cut or exposing ground (remember once ground is open, it will find its quickest way to ground and if that means it must go to a dirty ground, it will). I'd also ensure that ground is actually a clean source -- that means pure metal to metal -- no paint in between the wire and the bolt -- no plastic sleeve, etc.

With it staying on for 2 minutes after everything is supposedly off, it sounds like not everything is truly off.

I would suggest having them also ensure there is no drain on the battery (outside of what is considered "normal"). To measure that every vehicle has a fuse for the radio, I'd unplug that and then measure first as a baseline. Then plug that back in and try it again. I'm unsure how the MMI and all the other components tie into the radio -- if there's supposed to be a nominal drain (for whatever reason) or if there are separate fuses for different components. You could also if I recall bose or non-bose, there's a connector to the sub -- take that off -- which could be an issue.

In any case, what was the prognosis?
 
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