Detailed VDO-specific schematics can be found in the Wira Electrical for 4G1X and 9X document on Scribd.
"Look at this," Karim said, opening to page 42. He pointed to a schematic that looked like a bowl of spaghetti dropped from a great height. "See this? The Cooling Fan Relay. In a Japanese car, it goes from the battery, to a fuse, to a relay, to the fan. Simple. Linear. A child could read it."