[s-cars] @#$% Cruise Control

[Mark Strangways]

BFH time... ?

My baby Benz has the a similar problem, but with a twist.
You set it, it does nothing. Then 10 minutes or so later you de-accelerate 
for something and when you are about 20 MPH slower than setpoint, the cruise 
controls decides it just might be a good time to start.

The solution... I don't park the Audi on the same side as the Benz... these 
things are contagious you know.

I think if you are sure that you have all the signals and the switches are 
good, then it just might be time to check every wire for breaks or hardened 
insulation.
I just might be a problem were the vibration has gotten to a brittle wire.

My 2 cents.

Mark
----- Original Message ----- 
From: <calvinlc at earthlink.net>
To: "Mark Strangways" <Strangconst at rogers.com>; "s-car list" 
<s-car-list at audifans.com>
Sent: Monday, April 25, 2005 11:00 PM
Subject: [s-cars] @#$% Cruise Control


> OK guys, I have followed the Bentley procedure to the letter to diagnose 
> my
> cruise control issue.  Everything passes which indicates replace the
> controller.  I have tried 3 different controllers, none of which work
> consistently.  Once in a blue moon it will actually work.  Everything in 
> the
> Bentley Procedure is bulletproof with the possible exception of two 
> things.
>
> 1) One step says to monitor voltage between pin 8 and pin 5 above 20 mph 
> and
> make sure it is 12V.  I have 12V there all the time with the ignition on.
> Looking at the schematic I would expect 12V there all the time, it looks
> like it is coming straight from the fuse.
> 2) It doesn't really tell you much about checking the speedometer signal. 
> I
> see 2ms or so pulses coming down from 10V on this signal.  The signal 
> never
> quite makes it to ground, only about 1V or so, does anyone know if this is
> normal?
>
> I am at my wits end and I know at this point I know more than 90% of all
> mechanics about this problem so I don't think that's going to help me 
> much.
> Please Help!  Thanks!
>
> --Calvin
>
>
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