The following schematic illustrates the 2003 Jeep KJ Liberty Trailer Tow Relay. The trailer tow relays are located in a connector bank above the right rear wheelhouse and behind the quarter trim panel on vehicles equipped with the optional factory-installed trailer towing package.
1 – RELAY CONNECTOR BANK
2 – REAR BODY WIRE HARNESS
3 – LEFT TURN RELAY
4 – RIGHT TURN RELAY
5 – BRAKE LAMP RELAY
6 – FUSED IGNITION SWITCH OUTPUT (RUN) RELAY
Four individual relays are used, one each for fused ignition switch output (run), brake lamps, right turn signal, and left turn signal outputs to a trailer through the rear body wiring and connectors. The trailer tow relays are conventional International Standards Organization (ISO) micro relays The trailer tow relays cannot be adjusted or repaired and, if faulty or damaged, must be replaced.