[3SRT4ME]

According to the service manual, the horn is suppose to work regardless of whether the car is on. After service this past week at my dealership, the horn only works with the ignition on.

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[mileshoover]

Obviously you need to take it back to that dealer; someone screwed up.

 

[JonW]

Remind me of that old bumper sticker:
"Horn broke, watch for finger"