Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Smart Junction Box (SJB)
The SJB is connected to the standard corporate protocol (SCP) communication network. 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. 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
- keyless entry keypad
- remote keyless entry (RKE)
- power windows
- warning chimes
The SJB is equipped on all vehicles and is located behind the LH dash closeout panel. For removal information, refer to SMART JUNCTION BOX (SJB) . For additional information on interior lamps and illuminated entry, refer to INTERIOR LIGHTING . For additional information on exterior lighting, refer to EXTERIOR LIGHTING 0 . For additional information on power door locks, keyless entry keypad and RKE, refer to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS For additional information on power windows, refer to BODY SYSTEM - EXTERIOR . For additional information on active anti-theft, refer to ANTI-THEFT . For additional information on the manual climate control system, refer to CLIMATE CONTROL SYSTEM . For additional information on the warning chimes, refer to INFORMATION, GAUGES & WARNING DEVICES .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.