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)
2010 Ford Fusion SEL, 2.5 ASECTION Smart Junction Box (SJB)
The SJB is a combination of a multifunction electronic module and an interior fuse panel. It is located on the LH A-pillar, under the instrument panel. SJB functions control multiple vehicle systems, which include:
- Battery saver relay
- Brake shift interlock
- Delayed accessory
- Exterior lighting
- Global open (front windows only) (MKZ only, if equipped)
- Heated rear window
- Horn
- Interior lighting
- Moonroof (MKZ only, if equipped)
- Perimeter anti-theft
- Power locks
- Remote Keyless Entry (RKE)
- Tire Pressure Monitoring System (TPMS)
- Windshield wipers
RENDER: 1.0x
NO RELATED
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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.