You have insulted meine Vorvatern.

Some years back, a neighbor asked me to help troubleshoot his Volkswagen
Golf. He had the service manual for several models, and we were definitely
looking at the right model, but we could not trace one of the wires -- the
one that seemed to be causing the problem.

Finally applying the Holmesian rule that, once you're eliminated the
impossible, whatever remains must be true, I suggested we look at the
schematics for other models -- and lo and behold, it turned out that the one
for the Golf was the wrong schematic.

So much for "German precision".