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Stereo problems on cold morning

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Old 01-23-2014, 05:50 AM   #1
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Default Stereo problems on cold morning

Thanks for looking,

Went out to the garage yesterday morning on an usually cold day for our area (approximately 2 degrees out) and when I started the car the stereo starting making odd screeching sounds. I immediately shut off the stereo, however I continued to hear odd sounds for the drive in. This included popping/static/screeching and would come and go despite the stereo being off the entire time.

Later in the day the temperatures rose to approximately 25 degrees at which point the stereo worked fine. Is this normal? I'm assuming it was the factory amplifier acting up but haven't experienced this before, even in my other vehicles at the same temperature.

Matt
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Old 01-23-2014, 07:53 AM   #2
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sounds normal. I too make a few sounds when its cold out
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Old 01-23-2014, 08:55 AM   #3
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You may want to do a search this forum and quattroworld. I remember a long time (couple of years) ago somebody had this issue, but I don't remember the resolution.
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Old 01-23-2014, 10:38 AM   #4
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Thanks, I've attempted to search the forum for any related threads and so far have been unsuccessful.
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Old 01-23-2014, 11:58 AM   #5
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Default me too....

Quote:
Originally Posted by SeacoastA8 View Post
Thanks for looking,

Went out to the garage yesterday morning on an usually cold day for our area (approximately 2 degrees out) and when I started the car the stereo starting making odd screeching sounds. I immediately shut off the stereo, however I continued to hear odd sounds for the drive in. This included popping/static/screeching and would come and go despite the stereo being off the entire time.

Later in the day the temperatures rose to approximately 25 degrees at which point the stereo worked fine. Is this normal? I'm assuming it was the factory amplifier acting up but haven't experienced this before, even in my other vehicles at the same temperature.

Matt
When it got to 3 degrees F here a few weeks ago I had the same experience with my 2004 Bose system. Very erie as the screechung circled around the Suround system. Shutting off the system kept thing quiet in my car though. And when it got warmer that day everything was fine and it has not happened again even with the current cold snap.

So I am not concerned about it.
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Old 01-23-2014, 12:07 PM   #6
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Quote:
Originally Posted by SeacoastA8 View Post
Thanks for looking,

Went out to the garage yesterday morning on an usually cold day for our area (approximately 2 degrees out) and when I started the car the stereo starting making odd screeching sounds. I immediately shut off the stereo, however I continued to hear odd sounds for the drive in. This included popping/static/screeching and would come and go despite the stereo being off the entire time.

Later in the day the temperatures rose to approximately 25 degrees at which point the stereo worked fine. Is this normal? I'm assuming it was the factory amplifier acting up but haven't experienced this before, even in my other vehicles at the same temperature.

Matt

1st thing I would try under those circumstances would be to do the MMI reset. Then a VCDS scan as a followup measure for peace of mind.
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Old 01-23-2014, 12:39 PM   #7
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I have a feeling that it's fairly normal, and that phenomenon is originating in the amplifier. Things like mosfets, transistors, and capacitors all behave differently in the cold. Especially if there are electrolytic capacitors, the electrolyte could freeze, altering the behavior. In my old ford, the gauges would sweep all the way back and forth continuously until it got above 25 degrees inside. It seems electronics don't like the very cold.
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Old 01-24-2014, 07:18 AM   #8
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I was just about to create a new post when I say this one. My speakers don't work at all until it warms up to at least 10 degrees out. It's getting annoying. At least I can hear the roar of the W12 better.
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Old 01-24-2014, 08:59 AM   #9
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It was zero out this morning headed to work and once again the stereo was completely silent minus the occasional hissing/popping sound. At lunchtime it was 10 degrees and it works fine. Still seems so strange to have this issue with the Audi. Our other cars (with amplifiers) are all working perfectly.
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Old 01-24-2014, 09:12 AM   #10
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Quote:
Originally Posted by SeacoastA8 View Post
Still seems so strange to have this issue with the Audi. Our other cars (with amplifiers) are all working perfectly.
I suspect temperature induced changes in the fibre optic connections may also be causing (or adding to) all these reports lately.
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Old 01-24-2014, 09:47 AM   #11
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Default For those w/ a 2004-6, or a 2007...TSB's that are pretty on point

as a preliminary note, many of you don't post a year with your description/complaint, and/or it's not in your signature. It helps if you do and want help, since the issues and fixes vary by year. As you will see in a minute, you should consult the TSB's when these come up as a source--Audi produced Technical Service Bulletins, which the shop tech's use similar to what I describe here. With the passage of time and later owners, various of the older ones are getting lost knowledge wise. And to anticipate, no I can't post them directly, and I don't even know how to. They are part of Bentley. Sometimes by Googling the numbers you can find a version of them on the web somewhere from prior experience. See below. These may help, but I didn't try to read all of them in the stereo area. From experience when I have an issue and vaguely remember I might have heard it before, I start going through TSB's and hope I might find one or more that fit.

For 2004-2006's with Bose (which should be all of them; B&0 was 2007 IIRC) and a Bose 4000 amplifier, a TSB describes symptoms as no audio from all sources as long as vehicle is cold--"customer may experience the following conditions after entering his vehicle in very cold weather conditions (-12C, 5F)". Goes on to say if you disconnect amplifier or drive a few minutes of warm up, it returns to normal. Also says MMI menu remains displayed. Can also lead to a screeching sound as another symptom, and may store DTC 01044 in module 47 --sound system. It says the underlying issue is internal voltage stabilization for the processor. The Bose 6000 amplifier (i.e. a rev.) fixed it. But it also says a software update is available. There are update CD's apparently, which depend on your amp part # and software version. TSB 91 08 112, aka 2016657/2. Here's a link I found to it searching the second #: http://uberlame.com/a6_tsb/Stereo/BO...0condition.pdf

For 2007's there is a second/different TSB that may read on this. Issue originates in the CD player--2007 is when they intro'ed the MP3 capable ones IIRC, and I guess the early ones had issues. TSB description is popping sound and sound dropouts in all audio sources. TSB 91 08 105, aka 2014972/3. It also says no fault codes are stored, and it specifically says "It may happen more often in cold conditions." The test is to bypass the CD player optically. If it works, then it's a component issue inside and needs a new player per the TSB. Here's a web version of it I found: http://workshop-manuals.com/audi/a8l...56/page_16797/
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helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.

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Old 01-24-2014, 04:27 PM   #12
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Thank you very much for the extremely informative post. Mine is in fact an '06 and that describes the conditions precisely. On a side note I've updated my signature to reflect the model year.
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Old 01-24-2014, 04:27 PM
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