Just a thought (because I don't yet have a car to mess with)
Could it be that the flash method is required when the lights are not set to AUTO?
or alternatively
The CH LH feature is on the car as standard even without the convenience pack being fitted? So the flash method is required when no light sensor is fitted (ie as part of the convenience pack?
That was my thinking, as standard without the pack from the brochure:
Coming home headlight function (manual)
But auto as I quoted in post above with the pack/light sensor.
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