The horn relay is in the fuse box by the passengers left foot. Not sure how to get at it though
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under left side of dash on steering column
from what ive read you can switch the starter relay with the horn relay and give it a try.... if she starts and the horn dont work you have a bad relay
You have to determine the cause first. Check the horn switch and contacts, fuse, relay and the horn itself.
The 1990 Mazda 323 horn relay switch can be found on the front drivers side quarter panel. The relay switch will be on the inside of the quarter panel.
The 1999 Mercedes-Benz horn relay switch can be found on the drivers side front quarter panel. The horn relay switch will be behind the headlight assembly.