Fuse layout engine bay Audi a3

SOURCE: Need fuse box diagram

Check all your turn signal bulbs on the car's left side 

SOURCE: audi a3 brake light problem.Changed fuse,bulbs and

hi check behind the light assembly itself could be its not earthing out due to corrosion your mounting screws are your earthing point it only takes water getting in behind to cause this hope this helps

SOURCE: Fuse list for audi a3 sline 2 ltr tdi

Fuse nr. 24, F24, (20A) = Cigarette lighter

SOURCE: 2004 Audi A3 power windows and central locking

Yes they are on the same fuse. If changing the fuse doesn't fix the problem check the passenger footwell for dampness as water can get into the convenience control unit from a possible leaking pollen filter housing. If there is no dampness, the control unit could still cause this problem and it;s situated under the carpet in the passenger footwell.

SOURCE: rear wiper has stopped working in audi a3 - where

Yes, is the same fuse nr.41 (15A) !
For Audi A3 the fuse box is located on the left side of dashboard behind a plastic cover (for left hand steering wheel vehicle). On inner face of the plastic cover you will find the fuse diagram.
The fuse nr.41, (the second fuse from right to left direction, on the second row from bottom to upper direction, on the fuse box), F41 (15A) = Rear screen wash & wipe system !!!
Replace blowed fuse with new one and problem will be solved quickly !
Please rate my response. Thanks!