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.
Principles of Operation
The smart junction box (SJB) constantly monitors its subsystems for concerns. If a concern is found in one of the subsystems, the SJB will record the concern in the form of a diagnostic trouble code (DTC).
The ignition switch position is very important to the SJB functionality. Erratic or unexpected SJB functions can often be traced to problems with these ignition SJB inputs.
The SJB controls a variety of systems:
- battery saver relay
- heated backlight
- windshield wipers
- interior lamps
- remote keyless entry (RKE)
- power lock system
- exterior lamps
- power windows
- parking brake actuator warning chime
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.