Principles of Operation
The horn relay (part of the smart junction box [SJB]) receives the control and switched voltage from the battery junction box (BJB). When the horn switch (part of the driver air bag module) is pressed, voltage is supplied to the control (coil) side of the horn relay through the relay, to the clockspring and to ground. When the SJB detects the horn pad is pressed, the SJB energizes the horn relay which closes the switch and supplies voltage to the horn, enabling the horn to sound.
Normal Operation
The horn relay (part of the smart junction box [SJB]) receives the switched and control voltage from the battery junction box (BJB). When the horn switch (part of the driver air bag module) is pressed, the switch closes receiving ground from the vehicle harness through the clockspring through circuit 1205 (BK). Voltage is then supplied to the horn relay through circuit 1 (DB). The SJB energizes the horn relay sending voltage to the horn through circuit 6 (YE/LG), enabling the horn to sound. Ground for the horn is supplied through circuit 1205 (BK).
The horn relay (part of the smart junction box [SJB]) receives the switched and control voltage from the battery junction box (BJB). When the horn switch (part of the driver air bag module) is pressed, the switch closes receiving ground from the vehicle harness through the clockspring. Voltage is then supplied to the horn relay through circuit 1 (DB). The SJB energizes the horn relay sending voltage to the horn through circuit 6 (YE/LG), enabling the horn to sound.