Nissan 25605-7B000 Horn And Bracket Assembly

Before beginning electrical diagnosis, check the fuses. To access the horns, remove the left front inner fenderwell. Disconnect the electrical connector from the horns. To test the horns, connect battery voltage to the horn terminal using jumper wires; if either horn doesn't sound, replace it. If the horn does sound, check for voltage at the horn connector when the horn switch is depressed by connecting a voltmeter to the horn terminal and ground. If there's voltage at the connector, check for a bad ground at the horn. If there's no voltage at the horn, check the relay. If the relay is functioning, check for voltage to the relay power and control circuits; if either circuit is not receiving voltage, inspect the wiring between the relay and the fuse panel. If both relay circuits are receiving voltage, depress the horn switch and check the circuit from the relay to the horn switch for continuity to ground. If there's no continuity, check the circuit for an open; if there's no open circuit, replace the horn switch. If there's continuity to ground through the horn switch, check for an open or short in the circuit from the relay to the switch. To access the horns for replacement, remove the left front inner splash shield from the fenderwell. Disconnect the electrical connectors and remove the bracket bolt to detach the horns. Installation is the reverse of removal.