So the leveling motor isn't working then. Check the connection on the back of the headlight first I think and make sure it's in properly and there's no corrosion.
Without checking what signal is going to the motor I think the easiest way to check whether its the wiring or the motor is to probably plug the left headlight in to the right connector, which obviously would require removing it. You can just sit the headlight on top of the airbox etc and see if the beam moves. If it does then the motor in the headlight unit may have failed, or there may be internal wiring issues in the headlight. If it doesn't then it has to be a wiring fault with the car.
(disclaimer - I've never tried this myself but its what I'd be looking to do if I were in the same situation)
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