How do I stop my 2011 sonata with smart key from horn blowing at times , even when the key is sitting on my desk not touched?

Hello and welcome to ExpertHelp.com! My name is Relly De Jesus and I'm going to do everything in my power to answer your question to your full satisfaction!

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Hello Stanley

How are you doing? Hope you are well. As a first course of action, I strongly suggest that you remove the negative battery connector of the car and let it sit for 5 minutes or more before reconnecting it. This will reset the system and can get it back to it's normal operating state.

If the problem persist then there must be a problem on the hood switch or door jamb switch. It may be thinking that it's open that's why the alarm will go off every once in a while. Below is what the hood switch looks like

Hood switch

Door jamb switch

These parts do fail overtime and will require replacement if faulty. Hope this helps. Please let me know if there's anything else I can add or help you with. I'll be standing by for your response. Have a good day!

Relly

Dear Stanley, It was a pleasure helping you with your Hyundai issue today. Here is a summary of the resolution.

Issue identified : Intermittent alarm trigger
Solution Implemented : Door jamb and hood switch will require replacement. Solution Accepted
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