* Wiring: This is the most probable culprit. Worn, corroded, or loose wiring connections between the steering wheel, the horn relay, and the horn itself are common causes of intermittent electrical problems. Vibration from driving can cause intermittent contact in a loose connection.
* Horn Relay: The relay acts as a switch for the horn circuit. A failing relay might make intermittent contact.
* Horn Button (Steering Wheel): The contact in the steering wheel's horn button could be worn or dirty, leading to inconsistent contact.
* Horn Itself: While less common, the horn itself could be failing internally.
* Ground Connection: A poor ground connection can also cause intermittent electrical problems.
Troubleshooting steps:
1. Check the Fuse: This is the easiest first step. Consult your owner's manual to locate the horn fuse and check its condition.
2. Inspect Wiring: Carefully examine the wiring harness leading to the horn and the horn button for any signs of damage, corrosion, or loose connections. Pay close attention to the connections at both ends.
3. Test the Horn Relay (if accessible): The location of the relay varies by car model. Your owner's manual or a wiring diagram will show its location. You might be able to test it with a multimeter, or simply swap it with a similar relay (if there is one) to see if the problem moves.
4. Check the Horn Button: See if you can get consistent horn operation by carefully pushing the horn button in different spots. If the sound is weak or inconsistent depending on where you push the button, then the button itself might be faulty.
If you're not comfortable working with car electronics, it's best to take your Tempo to a mechanic for diagnosis and repair. Improper electrical work can be dangerous.
