Principles of Operation

PRINCIPLES OF OPERATION

NOTE: The smart junction box (SJB) is also known as the generic electronic module (GEM).

The battery junction box (BJB) supplies voltage to the horn relay (part of the smart junction box [SJB]). When the horn switch (part of the steering wheel) is pressed, ground is supplied to the SJB through the clockspring. The SJB then energizes the horn relay, sending voltage to the horn, enabling the horn to sound.

The SJB provides a momentary ground to the horn relay as a configuration confirmation for the auto-locks and for the tire pressure monitoring system (TPMS) sensor training. The SJB also provides a momentary ground to the horn relay when the anti-theft system is armed, and an on then off ground when an intrusion is detected or the panic button is pressed on the remote keyless entry (RKE) key fob.