To eliminate the chirp, you'd need to modify the car's electrical system. This usually involves one of the following approaches, all of which require some electrical knowledge and are done at your own risk:
* Disconnecting the horn relay: This is the simplest but potentially least desirable method. You'd locate the horn relay in the fuse box (usually under the hood) and disconnect it or remove it entirely. However, this will disable the horn completely, which is a safety hazard.
* Cutting the wire: You could trace the wire from the alarm system to the horn and cut it. This is a more precise method than disconnecting the relay, as it only silences the lock-related chirp, but it requires careful identification of the correct wire and proper splicing/connection if you ever want to re-enable the chirp. Incorrectly cutting a wire can cause damage to your car's electrical system.
* Installing an aftermarket alarm system: A more involved solution is replacing the factory alarm system with a new aftermarket system that allows you to customize its features, including disabling the horn chirp on lock. This is the most expensive option and requires professional installation unless you have significant experience with car electronics.
Before attempting any of these modifications, consult a wiring diagram for your specific 2000 Ford Focus SE Wagon. This diagram will help you identify the correct wires and components to avoid damaging your vehicle. If you are not comfortable working with car electronics, it is strongly recommended to take your car to a qualified automotive electrician or car alarm specialist. They can disable the chirp safely and correctly.
