How do you replace horn on a 1999 Cadillac deville concours?

To replace the horn on a 1999 Cadillac DeVille Concours, first, disconnect the negative battery terminal to ensure safety. Remove the engine cover if necessary, then locate the horn, which is typically mounted behind the front grille or in the engine compartment. Disconnect the wiring harness from the horn and unbolt it from its mount. Install the new horn by reversing the steps, ensuring all connections are secure before reconnecting the battery.