[s-cars] Outside Air Temp (G17) sensor wiring problem

[Martin Baggenstos]

Will diagnostics be revealved by vagcom for the climate control, or does it
have to be done directly as described in the pdf.

Martin

On Wed, Jul 17, 2013 at 2:10 PM, Tom Green <trgreen at comcast.net> wrote:

> You should look at the diagnostics for the c/c system to determine what is
> shutting the a/c
> off.  You will need to check the trouble codes in channel 1 and the a/c on
> channel 53 IIRC
> to look for specific sensors that signal shutdown.  The codes should be
> cleared after recording
> them so you can determine which are current problems in subsequent
> readings.
>
> http://12v.org/urs/Climate%**20Control%20Channels%20&%**20Codes.pdf<http://12v.org/urs/Climate%20Control%20Channels%20&%20Codes.pdf>
>
> http://forums.quattroworld.**com/s4s6/msgs/47427.phtml<http://forums.quattroworld.com/s4s6/msgs/47427.phtml>
>
>
> Tom '95 S6
>          '95.5 S6 avant
> Knoxville, TN
>
>
> On Wednesday, July 17, 2013, at 10:06 AM, Wayne Dohnal <wd43 at hevanet.com>
> wrote:
>
> My OAT reading has failed on-and-off occasionally for a few years. It
>> went to hard-fail mode a few days ago.  It would be easier to ignore if
>> it didn't lead to the air conditioner refusing to operate when it thinks
>> the outside temp is below zero.  This is a 1994 urS4.  Looking into it,
>> the wiring diagram doesn't match what's in the car (not the first time
>> that's happened!).  The diagram shows a brown/yellow wire connecting to
>> the G17 sensor via the orange connector in connector station 1 under the
>> dash.  The reality is that there is a brown/yellow wire going through
>> connector station 1, but at the connector for the G17 sensor it's a
>> brown/white wire.  At connector station 1 the wire from the sensor shows
>> an open circuit, and at the G17 connector it shows about 2k ohms to
>> ground.  I'm making a repair by adding my own new wire from the G17
>> sensor to connector station 1.  This makes the OAT readout work
>> correctly.  My question is: (1) Does the brown/yellow wire change to
>> brown/white somewhere inside the wiring harness, and the internal
>> connection has failed?, or (2) Is there more circuitry here, totally
>> missing from the wiring diagram?
>>
>> Wayne
>> 1994 S4
>>
>
>
>
>
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