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.

All parking, rear, license plate, and marker lamps are controlled by the SJB. The headlamp switch is hard-wired to the SJB. When the headlamp switch is in the headlamps ON or parking lamps ON position, the SJB processes this information and outputs the appropriate command to the parking and license plate lamps, which are hard-wired to the SJB. Only the left and right rear lamps provide lamp outage indication. Fault management of the parking lamps provides rear parking lamp functionality in the event of certain multifunction switch, headlamp switch, ignition switch or SJB failures.