I don,t quite get it either.If the usb socket/audio system were causing this much trouble,there would be a lot of Airbuses flying around out of control.
Yes, at first it sounds unlikely. However, I've been struggling to understand why the steering varies with time and is different on different days. Normal mechanical systems cannot do that! Also, why the faults are more obvious to me than to Hyundai trained staff at the main dealer.
One possible difference, is that I often replay audio books from USB flash memory sticks.
There are several ways that using the car's USB/audio connector might be affecting the steering:
- Extra power-drain from a supply shared with the car's electronics?
- Extra current through a possibly faulty earthing point?
- Extra power-drain from a shared 5 Volt reference circuit, to power the USB device: Perhaps this same 5 Volt reference also powers some sensors?
- Digital interference from the data signals from the USB device, interfering with data signals from the sensors?
Without any wiring or technical info. about the i20, I can only guess. But these do seem plausible causes.
I have tried a variety of the USB flash devices I commonly use; trying to discover whether perhaps one of my devices is more likely to trigger problems? I've also tried to see whether eg. MP3 files are better / worse than WMA files and to try different data encoding bitrates.
But I think that the i20 has some kind of built-in self-check / self-calibration process: Almost certainly when the ignition is first turned ON; possibly later while the car is in use? Also, it seems to store and keep this calibration for some time after the ignition is turned OFF?
So simply plugging / un-plugging a USB flash memory stick or switching the audio system ON / OFF does not always trigger or remove the problem. Even trying to repeat the same test after several minutes or hours does not always give the same results.
The most reliable way (but still not fool-proof) to trigger the problems, is to turn OFF the ignition while replaying a USB flash memory stick and to leave the car for several hours. Next time the ignition is turned ON, the car's audio system will automatically turn ON and resume replay of the USB flash memory stick; if you're lucky, from the same point in the audio book.
Re-starting the i20 like this, usually puts its steering into the "nasty" mode.
To get out of "nasty" mode: Switch OFF the car's audio and remove the USB flash memory device BEFORE turning the ignition OFF. Leave the car for several hours; possibly until next day?
Re-starting the i20 like this, usually puts its steering into the "better" mode.
But, nothing I've tried so far, has been 100% repeatable: There are too many possible options. For example, if something in the car's computer is perhaps overheating; what about the effect of outside ambient temperature, on different days?
Edited by RS2016 on 21/07/2016 at 13:30
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