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 autolamps are controlled by the SJB. The SJB monitors the inputs from the headlamp switch and light sensor. When the headlamp switch is in the AUTOLAMP position, the SJB monitors input from the light sensor. The SJB processes this information and outputs the appropriate command to the exterior lamps. The exterior lamps are hard-wired to the SJB. The autolamps remain on for a preselected amount of time (approximately 20 seconds to 3 minutes depending on customer preferences) after the ignition switch is changed from the ON position to the ACC or OFF position.