Battery going dead on my 2010 a5 3.0 tdi please help

[Cocofitz10]

Hi every1 i only joined todoy but often used this site for advice always find it very helpful

my audi a5 battery keeps goin dead i changed the battery to the same spec one thats in it after a week of being fine dead again i coded the battery and i checked the b&o amp in booth they are not the cause i found the audi control module in the right side of the booth is clicking on and off draining 7amps everytime it comes on i disconnected the module but current is still draining but clicking obviously stops im completely stumped i dont want to bring it to audi until i no what the issue nearly is because the bill could be endless has anyone had this problem

[niall campbell]

take a video off the boot with your phone when you close it and your glovebox, to see the bulbs are not on when the doors are closed.

has your software been updated for the mmi / radio ?

When the car is running after say 10 minutes, what is the voltage of the battery when the car is running ?

[Cocofitz10]

Ive checked all that pulled every fuse in the car one by one while i was checking the current getting drained off the battery notting stopped this drain i seems lik the car is doing some kind of scan on itself constantly even when its locked

[Cocofitz10]

This is the part number thats clicking 8k0907801h does any one no exactly how many items this controls

[niall campbell]

That's the parking brake module


you need a scan as it may be for example the Electronic Parking Brake motor is drawing more power than it needs, sticking motor etc. a faulty relay etc

403 Forbidden

[Cocofitz10]

Is that the only thing its switching because theres about 40 wires going into it i thought it was doing a few different items

[niall campbell]

Its good you can hear it switching, but if disconnecting it doesn't help your battery drain then what is ?

I think you have to either get a scan by vcds or autel vag505 to see if any component has a fault, not shown by the engine managent light.

Or, you start pulling fuses one by one to see what is causing the drain.

First fuse I would pull is the radio

[Cocofitz10]

After many months i have finally found the problem it is the main control module €4000 the fuses wont kill it unless you pull them all hope this helps someone else

[hitorque18]

Hi,
i know this was a while ago but my Audi A6 30.tdi Quattro 2007 model, Le Mans s-line has similar fault battery seems to drain? Alternator charging ???