Principles of Operation

PRINCIPLES OF OPERATION

The smart junction box (SJB) is connected to the standard corporate protocol (SCP) communication network. The SJB controls both interior and exterior lighting, body functions, and active anti-theft functions. In the absence of the dual automatic temperature control (DATC) module, the SJB receives input from the function selector switch to operate the manual climate control system. If one of the bus wires becomes shorted to ground or voltage, communications can continue at a degraded level. Check circuits 914 (TN/OG), and 915 (PK/LB ) between the SJB C2280b and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the SCP network, damage to the DLC C251, or damage to the SJB C2280b. The SJB is a combination of a multifunction control module and an interior power junction box. SJB functions control multiple systems which include:
- illuminated entry and interior lamps
- exterior lamps
- perimeter alarm
- power door locks
- auto-locks and smart locks
- remote keyless entry (RKE) keypad
- RKE system
- power windows
- warning chimes

The SJB is equipped on all vehicles and is located behind the steering column cover and reinforcement. For removal information, refer to Smart Junction Box (SJB).

The SJB controls a variety of systems.