SCANIA электросхема реле управления фарами

R4, Main and dipped beam 
See also the description for S1.
Diagram 1 shows what happens in the relay 
when light switch S1 and main/dipped beam 
switch S25 are set to different positions.
56 = Lighting (S1)
FD = Main/dipped beam (S25)
FL = Main beam flash (S25)
56A = Main beam (S25)
56B = Dipped beam (S25)
алгоритм работы реле
1 When the light (56) is switched on, dipped 
beam is automatically selected.
2 0 < t1, t2 < 0.25 s