[s-cars] RE: Audi S6 No Start
audi at humanspeakers.com
Sat Dec 24 16:24:32 EST 2005
> Given the complexity of the electrical systems (and getting
> worse in the future, until we'll need to be network engineers),
> why Audi and/or Bentley don't strip out and isolate the various
> modules (e.g, this is the ABS circuit wiring, and that circuit
> only) is beyond me. Yes, it will take more pages, but it will
> save the $$$ mechanic time. Having to follow a single wire
> through the maze across pages is silly. I usually re-draw just
> what I need, so I know what I'm dealing with.
Wait a minute... that's how they *have* been organized since
approximately the type 44 and type 89 (not sure if the earliest type 44
manuals are...). That is, each function gets its own "mini-schematic,"
with the only reference to other functions being if they are soehow
It takes a lot more paper, and in some ways is clearer, *but* it makes
it really hard to diagnose things like a blown fuse, since there is no
indication of where else a fuse may provide power on any given part of
Example: My recent dead instrument cluster gauges. Turned out their
fuse was blown, but not because of them (it was the wires going into the
trunk lid shorting out). I literally had to leaf through the entire
40-50 pages or so of diagrams looking for other instances of that fuse,
until I had id'd it as also powering a few other circuits, which I could
In the old style diagrams, there would have been one "picture" of the
fuse, and lines leading to all the things it provided power for.
Admittedly, this can make tracing some wires a pain, but at least any
traces that went from page to page were id'd with letters (and I used to
highlight them with color and annotate some things myself). I did once
see a lovely old VW (Rabbit?) manual where the diagram was a four page
or so foldout - and in glorious full color! Those days are gone with
the ever-increasing number of functions and circuits, of course. And
the cost of color printing...
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