Highbeam assistant reprogramming

Is it possible to reprogram the highbeam assistant on my E class 2012 350 cdi,

as it is now the assisnktant doesn't work under 45 kp/h.

I have a dark and narrow road with a speedlimit of 40 kp/h on my way home

and it would be good to be able to use the assistant even at low speed.

Thanks in advance,   Bjorn.