These changes to the regulation permitted automakers to implement a less-costly DRL, such as by connecting the high beam filaments in
series to supply each filament with half its rated
voltage (有些车DAYTIME灯和大灯是同一个灯,只是电压不同), or by burning the front
turn signals full time except when they are actually flashing as turn indicators (有些车DAYTIME灯和转向灯是同一个灯).
http://en.wikipedia.org/wiki/Daytime_running_lamp
请检查用户手册,确认DAYTIME灯是大灯或者转向灯.然后再确认大灯或者转向灯是否工作正常.