I have a 2007 Q7, which seems to drain the battery whenever it feels like it. the car can sit from friday night to monday morning and starts no problem, and some mornings nothing at all. I did notice this week, that there seems to be some sort of electric motor running behind the n/f wheel arch, with the car switched off and locked. tried unlocking it and it still stays running. next morning battery flat. listened all day when switching off and couldn't here anything, car started all day without problem. following day stopped at work and heard this motor running again, finished work and again wouldn't start. Anyone got any ideas what this could be ?

 

thanks

 

Have you had the battery tested - do you know if the battery is the original from 2008?

do a search and u will find i had the same thing turned out to be the ecu climate control unit in the dash had a fault and would wake up all the modules with would drain the battery other site i uses is vw audi forum

Hi James,

 

as far as I know it's the original battery

 

thanks

 

On 07/03/2016 at 11:06 PM, qstu said:

do a search and u will find i had the same thing turned out to be the ecu climate control unit in the dash had a fault and would wake up all the modules with would drain the battery other site i uses is vw audi forum

Is there anyway I can test something to find out if it's the ecu ??

turn car off then after 3 to 4 hours go out and see if the battery level has dropped on the mmi display from full which it should be on mine dropped after this time to half 50 to 60% to the point it went to 10% and car would not start

http://www.volkspage.net/technik/ssp/ssp/SSP_364.pdf have a look at the link and you will see what controls what and where it is

15 hours ago, scotty said:

Hi James,

 

as far as I know it's the original battery

 

thanks

 

Mark, if it's the original from 2008 then it's doing well at 8 years old. Worth getting that tested anyway as at 8 years old I doubt it's got long left?