Principles of Operation: Notes

WARNING: This page is about a different car, the 2012 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

The Smart Junction Box (SJB) supplies voltage to the interior lighting system. The interior lighting system illuminates the courtesy lamp to enhance visibility of the interior. When a vehicle door is ajar and the vehicle speed is less than 15 km/h (9 mph), or the instrument panel dimmer switch is in the DOME LAMP position, the SJB provides voltage to the courtesy lamp circuit. The SJB controls all interior lighting functions and timing by monitoring inputs from the door ajar switches, the instrument panel dimmer switch, and vehicle speed.

The instrument panel dimmer switch receives a voltage signal from the SJB. The instrument panel dimmer switch provides variable resistance for backlighting the Instrument Panel Cluster (IPC) and a toggle on/off function for the courtesy lamp.

The Remote Keyless Entry (RKE) receiver is contained inside the SJB. When the SJB receives an unlock request from a RKE transmitter, it unlocks the doors and turns on the courtesy lamp.