Horn sounds when car is parked when it's raining.

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! A horn that only honks when it rains while parked is one of the more entertaining automotive gremlins we've come across and your neighbors probably disagree! Since you've already replaced the relay and fuse the culprit is almost certainly moisture getting into the horn switch in the steering wheel or the clock spring behind it. Water can find its way into surprising places on a vehicle this age and when it reaches those electrical contacts it completes the circuit just enough to set the horn off uninvited. A corroded or damaged body control module connection is also worth considering since rain can expose weak points in weathered wiring. This one really needs a hands on electrical inspection to trace exactly where the moisture is creating mischief. Visit RepairPal.com to find a trusted shop in your area before your neighbors form a committee! If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554