[s-cars] Cruise control debugging

[Matthew Russell]

Good info, Calvin.  Thanks so much for keeping me in the loop.

I've always wondered if it were something loose in the dash, either 
from the stalk switch or another signal.  the speedo signal theory sits 
nicely with me, as i've got wierd things happening with autochek 
occasionally.  hopefully soon i can get the IC out, and get everything 
cleaned with contact cleaner

I'm suspecting a weak connection somewhere, with this being an 
intermittent problem and all.  Unfortunately, these are the worst kinds 
to figure out.

-Matt


On Saturday, May 28, 2005, at 11:07  AM, various listers wrote:

>
> Calvin,
>
> Thanks for the info on getting to the Control Unit.  Your theory about 
> the
> speedo signal sounds very possible.  Let me know how your diagnosis 
> goes.
>
> Thanks again,
> Brent.
>
> ----- Original Message -----
> From: <calvinlc at earthlink.net>
> To: "Brent Henry" <thehenrys at sympatico.ca>; <s-car-list at audifans.com>;
> "Matthew Russell" <skippertgore at msn.com>
> Cc: "Wayne Dohnal" <wd1 at hevanet.com>
> Sent: Saturday, May 28, 2005 10:39 AM
> Subject: RE: [s-cars] Cruise control debugging
>
>
>> Brent,
>>
>> The easiest way to get to it is to take out the glovebox and the kick
> panel.
>> There are a couple of options on how to get the glovebox out, one 
>> deals
> with
>> Torx bits in hard to get at places and one deals with prying off clips
> from
>> a piece of plastic.  I think I wound up doing a combination.  The 
>> plastic
>> and clips thing always bothers me on 13 year old plastic.
>>
>> Once those two items are out it is a snap.
>>
>> I have soldered test leads onto the circuit card after I took it out 
>> of
> the
>> box and all the signals are getting there fine even when it doesn't
>> set...hence my frustration.  My only possibility now is that the
> speedometer
>> signal isn't quite the right amplitude.  It only goes down to 0.8ish 
>> volts
>> or so rather than 0 and if it interfaced to a TTL logic gate then that
> might
>> not be low enough.  It may be that that the speedo connection that 
>> goes to
>> the CC unit from the dash isn't making good contact.  That's probably 
>> my
>> next place to go.
>>
>> --Calvin