What problem is your Uncle having? As far as having a wiring schematic, I don't think too many people have those. VW has a publishing agreement with Robert Bentley Publishing out of Cambridge, MA. Currently, the only manual available is in CD form. I haven't bought one yet since the car is still under warranty.
Is your Uncle looking to disable the DRLs?
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section