This should be a successful recipe to test the cornering lights:
- at night, put the light switch in "auto mode", fog lights off
- remove the handbrake
- put the car in first first gear and keep it clutched
- turn the steering wheel right, you will see the right side illuminate
- bring back the steering in the middle, the right side light shuts off
- (same thing happens of the left side if your turn to the left)
- you can repeat and enjoy as often you want
I also noticed that they turn on automatically when you put the turn signals.