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It should be automatic. There is a light sensor (somewhere) on the tail light. On my Domane+ I can get the flashing to start by shining a bright light at the tail light (which is under the seat). During riding, it consistently starts flashing with the sun low(ish) and behind me. If the sun is...

I have a Domane+ with a similar light system. There is definitely a light sensor that triggers this (and no manual controls). I'm not sure why there isn't more documentation on it. On the Domane, the tail light is tucked under the seat and the sensor is somewhere on the tail light. I haven't...