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On a 2016 Volkswagen Jetta, the horn relay can be found in the interior fuse panel located on the left side under the driver's instrument panel. The horn relay is an electronic component that is part of the vehicle's horn system, controlling power to the horn. A burning odor coming from the horn relay is a common sign of a problem with it. If the relay burns out, which happens occasionally, it may emit a burning smell and in severe cases, it could burn or melt.