Yeah, so it's not immediately clear Mick
I've taken one of the SE mirrors apart and compared it to a standard Vogue one, and then also a D4 HSE one (high beam assist fitted)
The reason was that I was looking at fitting Trail-Air to mine and this system replaces the mirror for one with a video screen in it. Anyway, long story short I was looking at the various sensors to see if they could be added to the trailair one, especially the sensor on the LIN Bus which controls the auto-dimming of the exterior mirrors. All a bit of a nosebleed really, but I am fairly sure the High Beam Assist was on the D4 mirror.
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