GM 84594588 HORN KIT,GENERIC (HIGH NOTE)

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Start by locating the horns on each side of the vehicle.

Remove the left (driver's side) headlight housing. Detach the battery vent hose from the battery tray. Disconnect the electrical connector, remove the mounting bolt, and detach the horns. Installation is the reverse of removal.

If the horn is not working, the first thing to check is the fuse. You can find the fuse box under the lower right side of the dashboard. If the fuse is blown, it can be easily identified. If the fuse is in good condition, disconnect the electrical lead at the horn and use a jumper wire to connect a 12-volt source (positive battery terminal) to the wiring terminal on the horn. If the horn does not blow, the problem may be with the grounding of the horn or the horn itself. If the horn does sound, then there is a failure in the circuit before the horn. In most cases, a failure of the horn relay is indicated if the circuit before the horn is at fault. Other possible issues include bent metal contacts on the horn actuator or loose or broken wires in the system. When checking or replacing the horn relay, be cautious as the threaded stud is always "hot" and shorting it to a ground could damage a fusible link, which would disable the vehicle until it is replaced.

Check the fuses before beginning electrical diagnosis. Disconnect the electrical connector from the horns. To test the horns, connect battery voltage and ground to the horn terminals with a pair of 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. Check for voltage at the horn while an assistant pushes the horn button. 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 OK, check for voltage to the relay power and control circuits. If either of the circuits 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. If the horn works, but the tone is off, either weak or strained, check the current draw of the horn, using an ammeter during operation. Hook the ammeter between the horn connector and the terminal on the horn. A correctly operating horn should draw 4.5 to 5.5 amps. Use the adjusting screw on the horn to achieve this draw. The horn on is located in the fenderwell. Raise the vehicle and support it securely on jackstands. Remove the front wheel and the fenderwell splash shield for access. Disconnect the electrical connectors and remove the bracket bolts. Installation is the reverse of removal. Make sure the area of the body is clean where the horn bracket attaches. This is the ground point for the horn.

The fasteners securing the front of the inner fender liner must be removed, followed by the bumper cover trim panel from below the headlight.

The inspection procedure for the horn assembly involves locating it inside the right fender, next to the battery. On models from 1999 and later, there are two horns, one in each fender, with the left horn requiring the removal of the windshield tank first. The first step is to unplug the electrical connector from the horn. To test the horn, battery voltage needs to be connected to the two terminals using jumper wires. If the horn doesn't sound, the current draw should be checked with an ammeter, which should be around five amps at battery voltage. If the amperage is over 20 amps, the horn needs to be replaced. If the reading is around 18 amps, the contact points are not open, and the adjustment screw should be turned counterclockwise to open the points and lower the amperage until the proper level is reached. If the horn still doesn't sound, the problem could be in the switch, relay, wiring, or open points. To remove the horn, the electrical connector should be unplugged, the bracket bolt should be removed, and the horn should be lifted from the engine compartment. Installation is the reverse of removal.

Simply reverse the steps of removal.

If you're working on an SUV model or a Chevy truck model, remove the headlight housing. If you're working on a GMC truck model, remove the fasteners securing the front of the inner lender liner, then remove the bumper cover trim panel from below the headlight. Disconnect the electrical connector from the horn. Remove the horn mounting bracket bolt and remove the horn and bracket. Detach the horn from its mounting bracket. Installation is the reverse of removal.

The electrical connector must be disconnected from the horn.

Start by locating the horns on each side of the vehicle.

The electrical connector must be disconnected from the horn.

If the horn still doesn't blow, the problem may be with the grounding of the horn or the horn itself.

The fuse box can be found under the lower right side of the dashboard.