If the car horn in your Dodge Neon is not functioning properly, it is best to replace it. The biggest difficulty in installing a car horn on this model is accessing the horn. It is mounted to a support bracket near the fender and connected by wires to the steering column, but the Neon has a compact compartment. You will need to remove other components in order to reach the horn.
Open the car hood to the engine compartment. The horn is on the passenger side of the compartment in between the headlight and the windshield fluid reservoir.
Remove the radiator grille, removing its two mounting fasteners with a wench and detaching it from the fender.
Unscrew and remove the two top retaining bolts holding the headlight housing to the frame using the wrench. Disconnect the headlight's electrical connector and remove the housing.
Disconnect the electrical connector to the current horn. Remove the single bolt connecting the horn to the support bracket using the wrench and remove the horn.
Connect the new horn to the bracket using the bolt and connect the electrical connector.
Reconnect the headlight housing with its electrical connector and retaining bolts. Reconnect the grille with its fasteners and close the hood.