Principles of Operation

PRINCIPLES OF OPERATION

The smart junction box (SJB) controls the exterior lighting of the vehicle. This system relies on the standard corporate protocol (SCP) communication network in order to transmit and receive signals. It is very important to understand:
- where the input (command) originates from.
- all information (messages) necessary in order for a feature to operate.
- which module(s) receive(s) the input or command message.
- if the module which received the input (message) controls the output of the feature, or does it output a message over the SCP communication network to another module.
- which module controls the output of the feature.

The fog lamps are controlled by the SJB. The SJB monitors the fog lamp switch (integral to the headlamp switch) input. When the fog lamps switch is engaged, the switch provides a signal to the SJB. The SJB then activates the fog lamp relay, providing power to the fog lamps. The fog lamps will not illuminate when the high beam headlamps are on.