Hmm, that's just too bizarre. Do parking lamps flash or stay on as well, like something triggered the horn chirp? What happens if you go through the same motion and turn the key to ON but just wait without starting? It's a shot in the dark but, given the age of your vehicle, maybe the door lock switch is sticking and not returning to neutral. Check the passenger side as well.
Horn Beeping after car starts?
Hey everyone...Hope all you Dad's had a great Fathers Day!! Still working on my RPM issue, but now something else has appeared. 
The past two mornings when I start my car, the horn will beep once. Very strange, it doesn't beep anymore after that, it only seems to do it as soon as I start the car.
Ideas?
The past two mornings when I start my car, the horn will beep once. Very strange, it doesn't beep anymore after that, it only seems to do it as soon as I start the car.
Ideas?
