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D2 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc

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  #21  
Old 18th January 2020, 03:02 PM
HPsauce HPsauce is offline
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Made some surprising progress today.
As it was fine and sunny I decided to have another look and potentially remove one of the bolts to check exact dimensions.

I removed both the middle 2 in the end and saw that under one of them was what looked like a partial washer. Realised quickly that was the sensor fixing and it was now loose!
Decided to prise up the clips on the front edge to peek underneath and the innermost fixing of the panel actually popped out undamaged! The jammed screw there was actually undone just enough to let the panel slip out.
With only the outer screw left holding it the panel is easily flexible enough (quite rubbery at the outer edge) to lift up and get at the sensor.

I took the sensor off and indoors to look at it. Saw debris under the little 2-hole cover and managed to blow it out. Then decided to see if the little cover was removable as it looked like it was. It just prised off easily and I found yet more debris inside, cleaned it all out with a clean dry artists brush and clipped it back on.
Finally I took my Dyson to the space under the panel, it was full of plant debris! And I also remembered to clean the underside of the panel itself as there was loads of stuff there too. Put everything back, that's quick and easy.
The two dodgy bolts can wait for another time; I currently have no need or desire to get into the ECU box. And if the sensor is still faulty I know I can get another and replace it easily enough now.

I don't know how the sensor works so apart from brushing away debris didn't touch any surfaces and definitely no solvents. Does anyone know what the principles of it are?
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!)
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.

Last edited by HPsauce; 18th January 2020 at 03:16 PM.
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  #22  
Old 22nd January 2020, 03:05 PM
HPsauce HPsauce is offline
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Quote:
Originally Posted by HPsauce View Post
I don't know how the sensor works so apart from brushing away debris didn't touch any surfaces and definitely no solvents. Does anyone know what the principles of it are?
I guess not, and any amount of "googling didn't throw up an answer either.

But my cleaning efforts seem to have been rewarded so far as this error has not come back:
Quote:
Originally Posted by HPsauce View Post
01592 - Air Quality Sensor (G238) 57-10 - Electric Circuit Failure - Intermittent
In fact today I had a totally clean VCDS scan, apart from the inevitable low alarm battery warning.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!)
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
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  #23  
Old 22nd January 2020, 03:41 PM
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steamship steamship is online now
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Quote:
Originally Posted by HPsauce View Post
I guess not, and any amount of "googling didn't throw up an answer either.
How about the following PDF, starting from page 6?

https://iopscience.iop.org/article/1...1/1/012033/pdf
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My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts

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My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds
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  #24  
Old 22nd January 2020, 04:03 PM
HPsauce HPsauce is offline
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Thanks for that Sean, well researched.
It doesn't say a huge amount (and appears to be based on BMW designs, probably very similar to Audi) but these are the key sections:

Quote:
The air quality sensor is a metal oxide sensor. This sensor is highly sensitive to various smells and pollutants that are typical of traffic.
The automatic air recirculation control sensor evaluates the concentration of carbon monoxide and nitrogen oxides in the intake fresh air.
The air quality sensor has reached its operating readiness after 30 seconds and responds to ambient air changes.
This sensor consists of two resistor elements and an electronic component.
The 30 seconds "warm-up" time is consistent with the Audi system and I presume the resistors are the sensor and the electronic component converts that to a signal used by the HVAC system.

Funnily enough one of my neighbours specialises in developing sensors of this type, though mainly for use in the oil and gas industry, so I'll ask him what he knows when I see him next.
__________________
2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!)
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
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  #25  
Old 22nd January 2020, 04:10 PM
MikkiJayne MikkiJayne is offline
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That sensor is identical to the one used in every Audi other than the D2. I think it basically works like an O2 sensor, but looking for oxides rather than oxygen. The two resistor elements are probably some exotic metal compounds which respond to the particular oxides.

I know they stop working when the magic smoke escapes!
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  #26  
Old 23rd January 2020, 12:20 AM
ainarssems ainarssems is offline
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Or the resistors are for heating it up to working temp
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