Fuse 39 - what else runs through this?

[zhaniaudi]

I have a battery drain issue that has been narrowed down to fuse 39 (20 amp). My mechanic thought it was the head RNS-E unit, but when this was disconnected and fuse 39 replaced into the fuse box, the battery was still being drained, typically in under 24 hours, indicating a fairly heavy draw. With fuse 39 removed, regardless of whether the head unit is connected or not, the battery drain disappears and my car behaves as normal (it starts, runs and re-charges the battery). Has anyone come across this or happens to know what else is connected through fuse 39?

[RAudi Driver]

When you disconnected the head unit, did you also disconnect the Bluetooth module? I think it's a separate box that's also powered.

[zhaniaudi]

When you disconnected the head unit, did you also disconnect the Bluetooth module? I think it's a separate box that's also powered.

No I didn't, but my mechanic is looking into this now. From reading other similar threads, it seems to be common for the factory bluetooth module to go bad over time so this was going to be our next item to check. Thanks.