'05 X5 4.8iS LeMans

Folks, after reading owner's manual I am confused to "what exactly I need to do" to find out if my headlight washers are working or not? I read on the web that after 5-6 sprays on windshield the headlight washer cycle should initiate itself automatically (not happening in my case) and after that to check "the washer pump (where is it located?). It drives me crazy not being able to figure out this feature especially during dirty winter days.

Thank You