Faulty LED notification on a Motorola Moto G.

The LED notifications on my Motorola Moto G don’t work at all. All the relevant settings in the menu are checked appropriately, as I have copied them from those of a friend with the same model. But I don’t see any LED notifications ever. The sound notifications work fine, but never the LED ones.
Is there a way to fix this, because it seems silly to send it back to the shop for something like this…
