Toyota
Jeep Cherokee
 Service Manual
Horn systems » Description and operation
Horn

DESCRIPTION

The dual electromagnetic diaphragm-type horns are standard equipment on this model. The low-note horn is secured with a bracket to the left radiator closure panel brace, behind the front bumper. The high-note horn is secured with a bracket to the right radiator closure panel brace, behind the front bumper. Both horns are grounded through their mounting brackets and receives battery feed through its wire harness connector and circuit from the closed contacts of the horn relay.

The horns cannot be repaired or adjusted and, if faulty or damaged, they must be individually replaced.

OPERATION

Within the two halves of the molded plastic horn housing are a flexible diaphragm, a plunger, an electromagnetic coil and a set of contact points. The diaphragm is secured in suspension around its perimeter by the mating surfaces of the horn housing.

The plunger is secured to the center of the diaphragm and extends into the center of the electromagnet. The contact points control the current flow through the electromagnet.

When the horn is energized, electrical current flows through the closed contact points to the electromagnet.

The resulting electromagnetic field draws the plunger and diaphragm toward it until that movement mechanically opens the contact points.

When the contact points open, the electromagnetic field collapses allowing the plunger and diaphragm to return to their relaxed positions and closing the contact points again. This cycle continues repeating at a very rapid rate producing the vibration and movement of air that creates the sound that is directed through the horn outlet.

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