exley
New Member
Posts: 10
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Post by exley on Feb 1, 2019 13:37:53 GMT
Hi All, thought I would combine some knowledge I discovered in a couple different forums and threads and also discovered myself. I was able to completely disable the Ice warning in the cluster. I have a 2016 GTI so I needed a different security code. The Code that worked for me was 47115. I changed the adaptation p_ice_warning_entry_temperature to -10c (14F). In other discussions I saw reports that the lowest number accepted was -9c (16F) and that this only lowered the entry temp and did not disable the warning. That doesn't seem to be true for my car. p_ice_warning_exit_temperature was left at the stock value of 6c. Attachments:
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awall
New Member
Posts: 2
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Post by awall on May 9, 2022 1:13:16 GMT
Old thread but I'm wondering did this work? I am looking to get rid of this warning also only to find that it can't be completely disabled. I'm thinking the change you made only adjusted the temperature the warning is initiated at. Where I live I saw -40 C last winter so setting to -10 C seems like the warning would still come on.
Thanks for any info you can provide.
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Post by dv52 (Australia) on May 9, 2022 6:30:08 GMT
awall : My hunch is that OP probably won't respond to your question because he/she hasn't been active since posting the advice above. But it's an interesting hypothesis- I don't know if it will work - but I very much doubt that it will disable the alarm entirely for the following reason.
If you are not aware - the ice warning function has 2 x set points; entry temperature and exit temperature. The way that the function works is via an engineering technique called "hysteresis". In this technique, the 2 x set points form a type of "dead-band" between the 2 x temperatures - meaning that if the ambient temperature is between the 2 x temperatures, the alarm will remain in whatever state it was before the temperature entered the dead-band. So :
- if the ambient temperature falls below the entry temperature, the alarm is triggered and if the temperature then starts to rise - but is within the dead-band- the alarm will remain armed. In this case, the alarm won't be cleared until the ambient temperature gets warm enough to exceed the exit temperature
- Alternatively, if the ambient temperature is above the exit temperature and then it gets colder - the alarm won't trigger until the ambient temperature is lower than the entry temperature
The advantage of hysteresis is that it stops the alarm from continuously re-triggering as the car travels through ambient temperature zones close to the trigger point - this is called "alarm hunting"
As I hope that you can see, this particular hysteresis system operates by having the entry temperature lower than the exit temperature and the default settings are: - p_ice_warning_entry_temperature = 4 °C (i.e.39 °F)
- p_ice_warning_exit_temperature = 6 °C (i.e. 43 °F)
So the factory dead-band= (6 °C minus 4 °C) = 2 °C
As I understand the tweak, the entry temperature value is changed to -9 °C and the exit temperature is unaltered. This means that after the tweak, the dead-band= (6 °C minus -9 °C) = 15°C. It also means that the tweak lowers the temperature at which the alarm is triggered - but the alarm remains armed for a much larger temperature range!!
From a theoretical perspective, I can't see why the tweak would disable the function entirely - but, you could always try the tweak and then tell us what happens!!
Don
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