Toyota 86510-AC010 Horn Assy, High Pitched

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Disconnect the electrical connector from the horn and test it with battery voltage. If it doesn't sound, replace it; if it does, check for voltage at the terminal when the horn button is pressed. If there's voltage, check the ground connection. If not, inspect the horn relay and its wiring. If both have voltage, test the circuit from the relay to the horn button. If absent, check for an open circuit or replace the horn button. If continuity exists, check for an open or short in the circuit from the relay to the horn. For removal, disconnect the connector and remove the bracket bolt. To reinstall, switch the removal steps going from the last step to the first step.

The horn on Tacoma models is situated behind the grille, between the radiator and the right headlight, while T100 and 4Runner models have an additional horn located on the left side of the radiator. To test the horn, disconnect the electrical connector and apply battery voltage to the terminals using jumper wires; if it does not sound, it needs replacement. If it does sound, check for voltage at the terminal when the horn button is pressed; if voltage is present, inspect for a bad ground at the horn. In the absence of voltage, examine the relay, noting that most horn relays are either four-terminal or externally grounded three-terminal types. If the relay is functional, verify voltage to the relay's power and control circuits, and if either circuit lacks voltage, inspect the wiring between the relay and the fuse panel. If both circuits receive voltage, press the horn button and check for continuity to ground from the relay to the horn button; if continuity is absent, look for an open circuit, and if no open circuit is found, the horn button should be replaced. If continuity to ground exists through the horn button, check for an open or short in the circuit from the relay to the horn. For horn replacement, disconnect the electrical connector and remove the bracket bolt to detach the horn from the body, then unbolt the bracket from the old horn and attach it to the new unit, with installation following the reverse order of removal.