It is raining heavily; why don't you turn on the windshield wipers?

下这么大的雨，你怎么不打开雨刮器呢？

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With the emergency brake remaining "set" have the truck driver turn on and test the headlights both high and low beams, both left and right front signal lights and the windshield wipers.

将刹车继续“放”在紧急制动档，让驾驶员使卡车转弯，以此试一下车辆的前照灯，包括大灯、小灯、左侧和右侧信号灯以及挡风玻璃刮水器等。

youdao

Consumer Reports vehicle testers, who are in and out of a variety of vehicles during a year, would sometimes accidentally shift cars into neutral when they intended to turn on the windshield wipers because they mistook downsized shift levers for wiper-control stalks, Mr. Fisher says.

WSJ: Changing Gears: Auto Makers Ditch Familiar Shift Levers