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Q:

Reverse lights and horn not working,check fuses and bulbs both work,what next?
on 2008 Hyundai Elantra

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
We check fuses and bulbs
(1) Answer
You missed the open fuse! Check them ALL with a tester. Test light works great, just touch each side of each fuse to see if test light comes on.
Owners manual is a good place to find what fuse does what and where it is located exactly. Both of these circuits are most likely protected by the same fuse.