RE:Cruise control diagnosis

[Larry Smeins <lsmeins@ball.com>]

	So far all my Audi cc problems have been traced to disconnected
wires but that could change.  I haven't opened the cc box on by 5KCS but
did try it on some Mercedes boxes, Bosch built, several years ago.  I
found the major problem was bad relays and I couldn't find replacements
for them.  Has Bosch ever figured out how to make relays?  Oops, thats
another topic. One of the most difficult parts of repairing a unit like
the cc is identifying what the part is once you've decided its bad.  If
its a transistor it easy to substitue a universal part but with ICs it
can be hard to determine what it is.  If you have a reasonable
understanding of electronics I'll recomend going for it.  What's to
lose?

	BTW: My first experience with Audis was repairing the elctronic
ignitions in early 70s 100LSs.  Anybody remember those?  I went broke
with my lifetime warranty on repaired units thanks to Bosch's design.
Busch Jaeger's I could fix.

	Larry
	If you don't care where you are, you ain't lost.

> >Date: Wed, 13 Aug 1997 17:54:55 -0400 (EDT)
> >From: "Joseph F. Governali" <jfgovern@mailbox.syr.edu>
> >Subject: Cruise Control Diagnosis
> 
> >	The 87 5KTQ I purchased has a dead cruise control system...  (no
> >surprise, right?).  I followed the trouble-shooting guide in Bentley,
> and
> >have arrived at the last step:
> >	REPLACE THE CRUISE CONTROL MODULE
> >	(this would be the small, silver box under the dash)
> 
> >	Has anyone tried trouble-shooting this beastie on the component
> >level?  Are there common failure modes in the circuitry (ie.
> transistors
> >which usually fail, protection resistors which burn-out, etc)???  I
> plan
> >to launch into this thing tonight, and thought I'd fly this by the
> list
> >first to query the knowledge pool..  Any advise would be
> appreciated..
> 
> >	thanks! 
> 
> >	Joe
> 
> 
>