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I have a 2016 Smart Fortwo Passion Manual. My horn and alarm horn stopped working after I replaced tail lights back to stock. Checked the fuses in dashboard even replaced them horn still not working, switched back to the led tail lights see if that was problem nope still not working. Disconnected batter for hour and a half not working still. Any help and or suggestions would be great.
 

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For starters, I would look in your owner's manual and then see if there are any U-tube videos on the subject. The relays are probably part of the SAM unit.
 

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When I pulled the right rear side panel behind the passenger seat in my 2016 there were some fuses and at least 1 relay, if not more. Don’t have a clue what they are for.
 
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