I realised a while ago that the rear washer fluid pipe was leaking in the NSR quarter panel of the Golf, so as a temporary measure I just didn't use it.
But with the salt on the roads making it impossible to see out the back window after driving 5 miles I thought I'd best fix it.
When I took the rear quarter panel trim out I found a black plug that had badly corroded due to the washer fluid running into it. Everything at the back end of the car seems to work ok though, which has me confused.
Can anyone enlighten me as to what this plug powers?