Battery drain

[Adamstubbins]

My battery is draining over night it's a brand new battery and when I remove fuse 17 under the bonnet the drain stops does anybody no what this controls thanks

 

[NHN]

Year of car, engine & gearbox code, its in service book inside page.

 

[Adamstubbins]

It's a 2004 a3 8p 2.0 tdi dsg auto

 

[fangio]

My book says instrument cluster.

 

[NHN]

I did ask for an engine & box code, but alas, it depends on which electronics box is fitted, whether high or low, low shows the horns on F17 & high shows J285 dash panel insert, basically as above, cluster.