Principles of Operation

PRINCIPLES OF OPERATION

When the smart junction box (SJB) detects a request for lighting, it turns on the interior lamps by supplying power to the lamps. The request for lighting can be an open door signal from a door ajar switch, an interior lighting on command from the instrument panel dimmer switch or an unlock command from a remote keyless entry (RKE) transmitter.

The door ajar switches are hard-wired directly to the SJB. The 4 door ajar switches are normally closed when the doors are closed. The liftgate/decklid ajar switch is normally open when the doors are closed. All door ajar switches receive voltage from the SJB and each has its own ground circuit.

The instrument panel dimmer switch receives a voltage signal from the SJB. The instrument panel dimmer switch provides variable resistance for backlighting the instrument cluster and a toggle on/off function for the interior lights.

NOTE: On vehicles equipped with autolamps, the interior lights do not turn on for the illuminated entry feature if the SJB determines it is daytime.

The RKE receiver is contained inside the SJB. When the SJB receives an unlock request from the RKE transmitter, it unlocks the doors and turns on the interior lamps.