I "believe" that the headlight wipers are only available as part of the "cold weather package" that includes the heated seats. I live in the frozen inland Pacific Northwest, and LOVE the heated seats--I'll bet you would too, given where you live.

The headlight wipers work when the windshield WASHER is activated, not when the wipers alone are going. In order that they function, you would have to keep them free of packed snow similarly to the way you keep your windshield wipers clear of packed snow.

Order the cold weather package. Living where you do, you'll find most if not all of those items in the package to be beneficial--not to mention that it will make the vehicle considerably easier to sell, as most purchasers will expect heated seats and the like when buying a luxury car in your area.