Dim Light don't work

There is and issue with the dimmer switch,or bulbs have burnt out on the dim side.

I would change the lamps. The daytime lights use the "dim" filaments of the bulb.

there was a recall on the low beam relay not to long ago (not sure what year your car is tho) but my relay was in the fuse box under the hood and it was the only odd numbered one in that box do believe it's called hdm relay so if your is covered under the recall take it to the dealer and get it fixed for free