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Battery drain after aftermarket head unit install on 2008 TT - dealer says

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Battery drain after aftermarket head unit install on 2008 TT - dealer says

Old 05-18-2016, 01:15 PM
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Default Battery drain after aftermarket head unit install on 2008 TT - dealer says

Preface that I am terrible with cars and electronics in general.

All I wanted was to be able to use my phone hands-free and play Spotify through my sound system on my (new-to-me) 2008 TT. I guess I may have dreamed too hard.

-This January, I took my car to a well-established, well-reviewed major metropolitan stereo shop to install a Pioneer AVH-X4700BS. I had a great-sounding system which worked perfectly and I was very happy.

-Six weeks later, I woke up one morning to a dead battery. I jumped it, drove it around for a bit, no problem.

-A week later, I woke up to the same issue and so I took it to a battery shop who said the battery was good, just not fully charged.

-Bought a battery charger. Charged the battery. Dead battery three days later.

-Took car back to stereo shop, who said wiring was fine. Again to battery shop, battery/alternator checked out as good, but I elected to replace the 8-yr-old battery.

-One week later, dead battery. Took it back to stereo shop, furious. They kept it two days and realized Sirius receiver was hot to touch with engine off. Disconnected Sirius. Reported no more draw. Drove home. Battery dead 7 days later.

-Fed up, took car to dealership, who kept it for 10 days. Just called me today to let me know it's the Bluetooth receiver causing the draw. They have pulled my entire aftermarket unit and are going to try a cold start tomorrow.

-Received text just now that radio will be disconnected along with modules. I replied "so i will need to have the radio reinstalled?" reply: "No, if you replace radio with aftermarket it will do the same. The entire circuit for radio and modules work together. Only solution is to replace with OEM." I half-jokingly asked her if she had any other solutions aside from buying a new Audi. "No sir i don't have any other solution."

Sorry for the long story, but I spent an awful lot of money having the system installed, replaced a battery that probably didn't need replacing and am gonna face a ridiculous dealership bill AND i have no music in my car. I'm a little mad and would really appreciate your help. If you could keep the mocking of my noob knowledge and bad decisions to a minimum, I'd really appreciate it.

johash is offline  
Old 05-20-2016, 06:24 PM
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Sorry to hear of your issue. The electrical systems in cars are pretty complicated these days. The dealer would rather sell you an OEM system for sure. Money in their pocket and you likely won't get the system you're looking for. You may have better luck with the system installer. Loads of people have upgraded without issue so there must be a solution.
I have read that there is a sensor or switch in the driver door locking system that fails over time and causes the alarm system once armed to continue to try to communicate with the failed part. Causing a parasitic draw. The recommendation was to use a voltmeter on the battery and begin pulling fuses to determine which system is drawing power when no power should be drawn.
Short term you could keep a trickle charger on the car until it can be determined what the issue really is.
Sorry for not having a perfect answer but someone on here may.
Good luck the solution is out there.
martian4000 is offline  
Old 05-21-2016, 01:58 PM
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thanks, martian - dealer has no audi-branded options for me, which just seems bizarre. after all, i bought the TT after putting 200k miles on a '96 A6 whose stereo i upgraded to bluetooth myself - again, more complicated electronics, i suppose.

trickle charger solution would be an okay temporary fix, but i'm in an apartment without a garage/outlet.

interesting you bringing up the door locks as i've had intermittent difficulty UNlocking with fob (but no problem locking) since battery issues started. But dealer pulled fuses on locks and draw was still present evidently. I may try getting my money back from stereo store and trying again with a different one. Crutchfield had zero options for 2008 TTs back in January, but are now showing the Blaupunkt San Antonio 640 as compatible, which would be fine with me.

thanks again, if only for the reassurance that it IS possible to upgrade the unit.

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Old 11-08-2018, 11:16 AM
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Default battery drain

Hey there,

So very similar issue.
Installed new aftermarket radio and now have battery drain after about 24 hrs. If I use dsily no problem.
Installer replaced module and radio to no avail.

I have noticed issues with the key fob working and not working, but have no clue as to what eoukd cause tjos to happen. Had ar for 10 years never an issue.
Can anyone give some guidance, the installer s been in business 35 years and has good rep. They are tripped up as well.
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Old 11-08-2018, 06:44 PM
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Just to be clear I never found a solution either. My TT isn't a daily driver so it's on a trickle charger most of the time. The battery will strangely last weeks sometimes and other times just a few days. It's very odd and I've never had the time to volt meter each fuse for power draw. That is the solution checking for draws. It's a central locking system issue I believe. If you do find a solution please keep us posted.
martian4000 is offline  
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