The smart junction box is the interior fuse panel. It is also a computer module. It controls the body systems, lighting, etc.
NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).
The interior lighting system consists of the following:
- Door ajar switches
- Glove compartment lamp assembly
- Illuminated vanity mirrors (if equipped)
- Instrument panel dimmer switch
- Interior/map reading lamp(s)
- Liftgate ajar switch
- Liftgate glass ajar switch
- Liftgate/Trunk Module (LTM) (if equipped)
- Puddle lamps
- Rear cargo lamp
The interior lighting system consists of 2 subsystems:
The courtesy lamps are controlled by the SJB. The courtesy lamp subsystem consists of the ajar switches, the instrument panel dimmer switch, the interior dome lamps, the puddle lamps, the roof rail lamps, the cargo lamp, and the overhead console lamps (if equipped). The SJB supplies voltage to the courtesy lamps when the SJB receives the required input.
Interior Lighting Delay
The interior lighting delay feature provides temporary illumination of the courtesy lamps, parking lamps and dimmable backlighting after the doors are opened and then closed. The interior lighting delay feature keeps the courtesy lamps on for a period of 25 seconds. If during the 25-second delay time the SJB detects that the ignition has been turned to RUN, ACC, START, or if the vehicle is locked using the keyless entry keypad or the Remote Keyless Entry (RKE) transmitter, the courtesy lamps, parking lamps and dimmable backlighting illumination is discontinued.
The illuminated entry requests the courtesy lamps, parking lamps and dimmable backlighting to illuminate when the ignition is OFF and the RKE UNLOCK button is pressed or a valid code is entered using the keyless entry keypad. The illuminated entry requests the courtesy lamps off after 25 seconds have elapsed, the ignition is switched to ON, or when the RKE transmitter LOCK button is pressed.
The illuminated exit requests the courtesy lamps, parking lamps and dimmable backlighting (except the puddle lamps) illuminate for 25 seconds when all doors are closed and the ignition key is removed from the ignition lock cylinder. The illuminated exit deactivates when any door becomes ajar, the ignition key is inserted into the ignition lock cylinder, or 25 seconds have elapsed.
The theater lighting option ramps-up the courtesy lamps over 0.7 second when courtesy lamp activation is requested. The theater lighting feature ramps-down the courtesy lamps over 1.7 seconds when interior lighting deactivation is requested by any feature other than the panic alarm or the battery saver.
The demand lamps subsystem consists of the glove compartment lamp, the cargo lamp, all map/reading lamps, and the LH and RH vanity mirror lamps.
Fuse number F10 a 15 amp fuse feeds the SJB for interior lights and the heated seat switches, if this fuse is ok, Then a scan for codes of the SJB needs to be done using a dealer style scan tool.