I just noticed you're located in the UK, so nomenclature of various lights may differ from the US. Here, the Daytime Running Lights for the OEM LCI Xenon AHLs are the inboard headlamps that have louvred lenses.
Depending on BMW model, the "cornering light" could be the fog lights or the inboard headlamps.
Activation of the cornering lamps should be done through coding of the NFRM module, but of course, would require the steering angle sensors used by the AHL headlights; not sure if your car is equipped with that gear or if you retrofitted it as part of your halogen to LCI Xenon retrofit.