Principles of Operation
PRINCIPLES OF OPERATIONWhen the smart junction box (SJB) detects a request for lighting, it turns on the interior lamps by supplying power or a ground to specific 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 front door ajar switches are hardwired directly to the SJB. The 2 front door ajar switches and the liftgate ajar switch (manual liftgate) are normally closed when the doors are closed. The 2 rear passenger sliding door ajar switches are normally open when the doors are closed. The door ajar switches receive a reference voltage from the SJB or the power sliding door module and each has its own ground circuit.
The instrument panel dimmer switch receives a reference voltage signal from the SJB. The dimmer switch also has a ground circuit return to 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.
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.
All of the interior lights are supplied voltage through the SJB. The following lamps are illuminated by the SJB switching the voltage circuit:
- LH puddle lamp
- RH puddle lamp
- LH rear sliding door stepwell
- RH rear sliding door stepwell
- LH footwell
- RH footwell
The following lamps are illuminated by the SJB controlling ground circuits:
- Front row dome lamp or overhead console dome lamp (if equipped)
- Second row dome lamp
- Third row dome lamp
- Cargo lamp
The SJB provides power to the following demand lamps in order to control illumination when in the battery saver mode:
- Front row map lamps
- Second row map lamps
- Third row map lamps
- Cargo lamp
- RH vanity mirror lamp
- LH vanity mirror lamp