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| D2 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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Thread Tools | Display Modes |
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#11
3rd July 2015, 09:38 PM
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Replacement seat belt assembly arrived today. Great service from Prestige.
Fitted this evening without any difficulty. Outstanding fault code cleared no problem and stays cleared.......BUT airbag light remains on. Scanned again, still no codes, light still on. I was concerned it would do this following the above tests, so wasn't very surprised. Foxed now! Ideas welcome! Nick 
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#12
11th July 2015, 09:44 AM
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Scanned again with full fat version of VCDS. No codes, light remains on.
I've ordered another K suffix airbag sensor in case that is the issue. The only other possibility is that the light I think is the airbag light (because it says "airbag" on it strangely enough) is not in fact the correct one and there is another somewhere else which also has the bulb removed - although I think that would show a code.... Irritating! Nick
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#13
18th July 2015, 12:07 PM
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Correct K suffix Sensor/ECU obtained from Prestige and now fitted. However, I'm now officially disappointed as the saga continues to test my patience.
 Airbag light stays on Fault code 1025 warning lamp circuit faulty 31-00 short or open circuit (this in spite of the fact the lamp is glowing brightly!) Previous C suffix sensor showed no fault codes though the light remained on. Questions/possibilities 1. Am I really looking at the right light? It's in the main group of warning lights in the lower centre of the cluster and says "airbag" on it - which seems like a strong clue, but maybe this cluster has come from another car. Certainly I doubt the mileage it shows relates to this car. Could it be that the ECU is looking for another light either in the cluster or elsewhere which isn't currently connected? There was no bulb in the space when I got the car - I assumed to confuse the MoT man - but it wasn't taped over as some of the other blanks were and looked like a bulb had been fitted before. 2. Is the ECU fussy about the wattage of bulb fitted? I just a picked a random one from my collection. 3. Does this indicate a faulty cluster? It doesn't show any fault codes (FWIW)? Any clues appreciated - it's beginning to get wearing Thanks Nick
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#14
20th July 2015, 07:47 PM
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Am I fishing waters where only nutters go.......?
Nick
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#15
24th July 2015, 10:34 PM
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I would suspect it may be sensitive to wattage. I'd probably try borrowing a different bulb from the cluster somewhere into the airbag slot and see what happens.
The prefacelift clusters, in terms of the airbag light should be re really very interchangeable, and the facelift cluster just wouldn't fit, so I doubt any sort of cluster swap is as fault. The error message does seem really very specific, and in my experience I would definitely be concentrating hard in that area alone. The only thing you don't mention, but I assume you did, is to check the soft coding on the replacement module to ensure its coded the same way as the original one you took out ? Its seems an incorrect code is unlikely as you'd get errors about airbags being present not expected or vice versa potentially, but worth mentioning.
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#16
25th July 2015, 11:08 AM
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Thanks for the response.
Soft coding is the same (01022) as the original, sick, sensor and the new one. Even the C suffix A6 one I tried was the same. I agree on concentrating on the specific fault area relating to the code. I have now tried 3 different bulb wattages (0.9, 1.1 and 1.5 IIRC), which makes no difference. I don't know what is meant to be there as it was missing when I go the car. There are some test procedures mentioned in Elsawin which I will do more thoroughly when I've figured out how to get test probes on the bulb holder with the cluster plugged in (wires too short!). Wiring diagram doesn't really give clues as to how the circuit works as it is unclear what goes on in the cluster between the pins that supposedly relate to the airbag light and the bulb contacts. One of them isn't a direct connection (or is broken). It could be that the cluster feeds power to the sensor via the bulb and the sensor switches the earth. It could be that power feeds in both directions and the light goes out when it has 12v on both sides (like old fashioned ignition light) It could be that the sensor switches power to the bulb and the cluster provides a simple earth (least likely IMO) I have checked that the earth switch in the sensor multiplug is working. Tempted to break into the light wire near the sensor plug and try wiring a bulb directly to see what happens....... Nick Last edited by Nick Jones; 25th July 2015 at 11:11 AM.
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