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Jeep Wrangler TJ Horn Relay
The Jeep Wrangler TJ horn relay is a electromechanical device that switches battery current to the horn when the horn switch grounds the relay coil. The horn relay is located in the Power Distribution Center (PDC) in the engine compartment. The horn relay is a International Standards Organization (ISO) micro-relay. The horn relay cannot be repaired or adjusted and, if faulty or damaged, it must be replaced.
The ISO relay consists of an electromagnetic coil, a resistor or diode, and three (two fixed and one movable) electrical contacts. The movable (common feed) relay contact is held against one of the fixed contacts (normally closed) by spring pressure. When the electromagnetic coil is energized, it draws the movable contact away from the normally closed fixed contact, and holds it against the other (normally open) fixed contact. When the electromagnetic coil is de-energized, spring pressure returns the movable contact to the normally closed position. The resistor or diode is connected in parallel with the electromagnetic coil in the relay, and helps to dissipate voltage spikes that are produced when the coil is de-energized.
2002 Jeep Wrangler TJ Electrical Wiring Diagram Schematic and Pinouts
The following article contains detail information related to 2002 Jeep TJ Wrangler Electrical System and Wiring Diagram. The wiring diagrams are grouped into individual sections. If a component is most 
likely found in a particular group, it will be shown complete (all wires, connectors, and pins) within that group. The wiring section chart contains topics on general information and diagram overview, main sources of power and vehicle grounding, starting and charging, powertrain/drivetrain system, body electrical items and A/C, exterior lighting, wipers and trailer tow, power accessories, splice information, connector pinout, connector, ground and splice location.
This article also contains description and operation of fuse block, ground distribution, bus communication, starting system, fuel/ignition system, transmission control system, antilock brakes, instrument cluster, horn/ cigar lighter/ power outlet, air conditioning – heater, airbag system, interior lighting, audio system, rear window defogger, front and rear lighting, turn signals, wipers and power distribution.
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