Battery running flat. I need to know exactly what the first fuse is

[dwilde]

I am having a problem with my Seat Ibiza where the battery runs flat every night unless I take the first fuse out. What happens is that when the car is parked a whiring possibly electrical noise happens after 10 mins. The noise is coming from close to the rear right wheel. I have recently had a lambda sensor and the temperature control sensor replaced on the car so I would like to know if the first fuse marked:
1. Engine / Engine Electronics 15
connects to either of these. In which case I will take it back to the garage that I had these repairs done or if not I will take it to a SEAT specialist.

Any help would be greatly appreciated.

Thanks!

 

[TllEWL]

Is it the same whirring you get when you first open the driver's door in a morning/when returning to the car ?



Sounds suspiciously like the fuel pump ... not sure how it could be affected by the work you've described though

 

[RickC]

does the whiiring come back on as soon as you put the use in the next morning?

could be the door mechanism, doesnt this trigger he fuel pump to start when opened?

 

[dwilde]

Yes, the whirring does come back on when I put the fuse back in. I have also noticed that the screen for the aircon/radio comes on and is backlit when the whirring happens after I have left the car with the fuse in. That seems most unusual.
I have decided that as I come from an IT background I will apply some of my IT skills to this i.e. turn it off and turn it back on again. From what i have read on these forums, to do this I will need to disconnect the battery for 30 mins and then reconnect it. I will let you know if this makes a miniscle of difference.