Ah, then you have the (LCI) facelift adaptive bi-xenon headlights. Since you're in the USA...the bi-xenon setup works like this:
You have 1 HID bulb in each headlight that works as your low & high beam. When high beam is selected...a mechanical flap opens which increases the light pattern.

The inner bulbs nearest the kidney grills are your F-to-P (flash to pass) bulbs when you pull the stalk backwards. And they can also be your DRLs if you code that option on.

If neither low or high beam is working on the one side...both would come from t he same bulb. As Crystalworks mentioned...the culprit could be bulb, ballast, or ALC. Some diagnostic DIY needs to be done to determine if 1 or more is the problem...or if they can be dismissed to move on to other areas.

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