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This system is controlled via CAN Bus. If one side works in effect the other side should work.
The initial check should be at the connector for the Lamp Unit. You should check that you have voltage and earth at the connector. I can't remember what the voltage should be on one of those but from memory I think it is lowered to 5 Volt.
If voltage and earth is present here then I suspect it is the Lamp Unit itself. If there is no voltage or earth here then you could be looking at either a wiring fault or a module fault possibly with the door module.
A vehicle of this age should still be under warranty so I would suggest a visit to your local dealer as any interference could render your warranty void.
No there is no separate fuse for the system.
No problem at all.