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post #1 of 7 (permalink) Old 11-03-2011, 01:36 PM Thread Starter
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Q7 Battery Drain Problem

Hi there

I am new to these forums but a long term Audi owner (Allroad, A4 Cab and now Q7). Hoping to get some guidance so any help or advice very much appreciated.

We have an 11/06 ('07 model year) Q7. It is fitted with every single option available and hence why we still own it after almost 5 years. It has been, and is, a superb vehicle but starting to give problems. The latest issue is one of inconsistent battery drain problems.

We first noticed this issue when one morning the electric tailgate would unlock but not lift. We found we could only operate it when the car was started which immediately led us to suspect a battery issue. Indeed, on checking the battery meter it was at just 10%. This was after an overnight sat on the drive. In addition to the systems shutting down (tailgate, keyless, etc) occasionally we have noticed when the battery has drained that when you use the audio system you just get a massive booming from the sub and cannot listen. We have to turn the whole audio system off, wait a good hour or more and then turn back on and everything is OK. It has done this 2 or 3 times since the battery drain issue started, but not every time the battery has drained.

We continued with this problem, on and off, for about 3 weeks before the car was taken to our local franchised Audi dealer for battery checks. They came back and said under load the battery was not holding charge and so recommended we have a new battery fitted.

I declined, as the battery drain problem was intermittent and would go for 3 or 4 days with no drain and then in a matter of hours it would drain to 10% with many of the vehicles systems shut down (protection mode I guess). I started testing things myself by both checking the vehicle visually after switching off and leaving for a couple of hours and also by starting to pull fuses one by one. After a couple of weeks the best I could determine was the DSP amp causing the battery drain. Whenever I pulled the 30amp fuse (in the boot area) serving the DSP amp the battery was never drained by the following morning. So, off to the dealer it went again with this info.

After 2 days they surprisingly said the DSP amp was faulty. To be more precise, a control unit within the DSP amp was faulty and it would cost £1,000 to replace the amp. Ouch!

Whilst the dealer had interrogated the battery manager history they told me "it's all code and will take one of our technicians about 3 hours to decipher it" and therefore they determined the DSP as faulty by simply measuring the current drain on the battery with the DSP fuse inserted and then removed. Basically, with the fuse inserted the current draw was 5.16A but just 0.03A with it removed. I do not know how long the vehicle was left between tests etc.

So, to my questions.

1. How can I interpret the printouts they have given me, which include test outputs and battery history?
2. How can I be sure that it is indeed the DSP amp that is at fault?
3. Is there any way of getting the DSP amp control unit fixed rather than having to replace with new?
4. Who can offer a service to fix this at lower cost than a franchised dealer?
5. Any other help?

Many thanks

Neil

PS. I have a scan of the full printout (c. 25 pages) if anyone can help.

Last edited by wattsn; 11-03-2011 at 01:40 PM.
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post #2 of 7 (permalink) Old 11-08-2011, 12:01 AM
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I'm curious what you find out. I have a 2007 Q7 Built in early 2006 and it has had the same problem now for about a year. We had major problems with the motor and they finally replaced the entire long block with a new one but since then we have had battery issues.

Same thing. It will be at 100% for a few days and then all of a sudden it goes to 10% within minutes it seems. I had it at the dealer last Friday and they said they updated the software to make the Advance Key go to sleep when I'm not around but it doesn't seem to have helped.

let me know what you find out.
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post #3 of 7 (permalink) Old 11-19-2011, 07:45 AM
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That sounds very familiar

I think I recognize this issue. I just went through a similar issue with my Q7 2007. Delivered in December 2006 with all possible options. I started to get problems with the sound throught the MMI and subsequently noticed issues with the battery. In the end the battery completely died and would not survive an overnight stay in the drivelane. I brought the car to my dealer and they analyzed the battery activity. To my big surprise it turned out that somehow water had leaked into the amplifier and there was corrosion on the amplifier. As a result the amplifier was draining the battery. Meanwhile the amplifier has been replaced (very expensive service), and the problem was solved.

Do you have a panoramic sunroof? Two dealers in the US that I talked to told me that there is a known issue with the Q7 and the sunroof that in some cases there may be leakages into the space where the amplifier is installed.

Even though my Audi is 5 years old I am trying to claim the money back from the factory because this is not acceptable. I have moved (with my car) to Europe and had to pay EUR 1300 for a new amplifier plus installation. And there is not even a guarantee from the dealer that this problem will not happen again.

I am interested to hear if you are facing a similar issue. My dealer in Europe asked me if I had ever left the sunroof open because he couldn't understand how the water came into the amplifier. I never use the sunroof, so that couldn't have been the problem.

Btw, I notice someone else also wrote about this problem on the forum and suggested a cheaper solution: http://www.audi-forums.com/audi-q7-f...al-issues.html

I hope this helps.

Rogier
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post #4 of 7 (permalink) Old 11-21-2011, 10:25 AM Thread Starter
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Quote:
Originally Posted by Rogier View Post
I think I recognize this issue. I just went through a similar issue with my Q7 2007. Delivered in December 2006 with all possible options. I started to get problems with the sound throught the MMI and subsequently noticed issues with the battery. In the end the battery completely died and would not survive an overnight stay in the drivelane. I brought the car to my dealer and they analyzed the battery activity. To my big surprise it turned out that somehow water had leaked into the amplifier and there was corrosion on the amplifier. As a result the amplifier was draining the battery. Meanwhile the amplifier has been replaced (very expensive service), and the problem was solved.

Do you have a panoramic sunroof? Two dealers in the US that I talked to told me that there is a known issue with the Q7 and the sunroof that in some cases there may be leakages into the space where the amplifier is installed.

Even though my Audi is 5 years old I am trying to claim the money back from the factory because this is not acceptable. I have moved (with my car) to Europe and had to pay EUR 1300 for a new amplifier plus installation. And there is not even a guarantee from the dealer that this problem will not happen again.

I am interested to hear if you are facing a similar issue. My dealer in Europe asked me if I had ever left the sunroof open because he couldn't understand how the water came into the amplifier. I never use the sunroof, so that couldn't have been the problem.

Btw, I notice someone else also wrote about this problem on the forum and suggested a cheaper solution: http://www.audi-forums.com/audi-q7-f...al-issues.html

I hope this helps.

Rogier
Hi there. Thanks for your reply.

yes, we do indeed have the panoramic sunroof which was replaced in Dec '09 due to water leaking into the passenger footwell and soaking the carpet. The repair was done under warranty (although outside the warranty period) due to the drain pipes being blocked. They made no mention that the water had caused issues at the rear of the vehicle, unless the amp is located in the front of the vehicle. Would be interested to know.

Now, as expected the local Audi main dealer has no clue. We have just spent over a grand having the DSP amplifier changed as they said it was causing the battery drain. Had the car back a week and all seemed fine. Then today the battery drained in just 90 minutes. Dealer now trying to say that the battery is defective and needs replacing. When challenged re the replacement DSP amplifier they say that was also faulty and needed replacing. They seem to be making this up as they go along.

What they cannot answer is my question as to why the battery has been perfect for 8 days since the amp replacement and then today just decides to be faulty and drain. This is so frustrating.

I will update this thread as the saga unfolds.
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post #5 of 7 (permalink) Old 07-14-2013, 05:40 AM
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Quote:
Originally Posted by wattsn View Post
Hi there. Thanks for your reply.

yes, we do indeed have the panoramic sunroof which was replaced in Dec '09 due to water leaking into the passenger footwell and soaking the carpet. The repair was done under warranty (although outside the warranty period) due to the drain pipes being blocked. They made no mention that the water had caused issues at the rear of the vehicle, unless the amp is located in the front of the vehicle. Would be interested to know.

Now, as expected the local Audi main dealer has no clue. We have just spent over a grand having the DSP amplifier changed as they said it was causing the battery drain. Had the car back a week and all seemed fine. Then today the battery drained in just 90 minutes. Dealer now trying to say that the battery is defective and needs replacing. When challenged re the replacement DSP amplifier they say that was also faulty and needed replacing. They seem to be making this up as they go along.

What they cannot answer is my question as to why the battery has been perfect for 8 days since the amp replacement and then today just decides to be faulty and drain. This is so frustrating.

I will update this thread as the saga unfolds.
Hi, I realise the date on this thread but just wondered if you had any news for your Saga please?

My battery drains over night and I suspect the amp is faulty too,.
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post #6 of 7 (permalink) Old 07-14-2013, 05:45 AM Thread Starter
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Hi, I realise the date on this thread but just wondered if you had any news for your Saga please?

My battery drains over night and I suspect the amp is faulty too,.
Well, we sold that Q7 last year and bought a new one. Big mistake. The new one is not half the car the old one was due to spec. Live and learn.

However, we did fix the problem before selling, which was due to a faulty battery. We had the battery replaced, £400, and all sorted after that. Just wish I had not gone to the expense of changing the DSP which in my view had nothing to do with the problem.

My recommendation is get the battery replaced as it is half the price of replacing the DSP amp and most likely the cause. Good luck.
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post #7 of 7 (permalink) Old 07-14-2013, 05:56 AM
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Originally Posted by wattsn View Post
Well, we sold that Q7 last year and bought a new one. Big mistake. The new one is not half the car the old one was due to spec. Live and learn.

However, we did fix the problem before selling, which was due to a faulty battery. We had the battery replaced, £400, and all sorted after that. Just wish I had not gone to the expense of changing the DSP which in my view had nothing to do with the problem.

My recommendation is get the battery replaced as it is half the price of replacing the DSP amp and most likely the cause. Good luck.
Ah ok thanks buddy. Will get the battery changed and coded first.
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