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Are we talking the yellow wire from the slip ring underneath the steering wheel?
If so then everyone was left a little stumped. As some have noted there being a current available for readout and some not. The general consensus is/was that it was used for the OEM paddle replacement where by the paddles run through the slip ring into the ECU. If this was the case, then it would need coding of some description.
When I did mine, there was no read out of anything coming through and so appeared to be a dead wire, or one that was not in current use.
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