I don't think the light bulbs are broken, because I can see all light bulbs are on.
There is no individual cornering light in the Bi-xenon lamp assembly. On recent models, there are two methods of improving the lighting when cornering.
A. Integrated curve illumination
. This optimises curve illumination by the use of small motors (E1m2/E2m2) on each headlamp assembly that pivot the reflector frame from left to right. Actuation depends on:
1) steering angle computed OK
2) vehicle speed
3) yaw rate
B. Cornering function
. When turning (say, at junctions) the relevant front fog lamp is also switched on. Actuation depends on:
4) cornering illumination function enabled at the cluster
5) driving lights switched ON. or AUTO at night
6) speed < 40 km/h
7) turn signal active
8) steering angle computed OK
It would probably be hard to detect this feature working from the driver's seat unless you tested it at night on a dark country road.....
Also, how do I know my car has bi-xenon lighting?
It should be a CODE on your VIN. 615 was valid in 2005 - maybe a higher number now.