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.
2006 Ford Freestar BaseFACTORY OEM SERVICE PROCEDURE
Smart Junction Box (SJB)
SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Source | Perform Test |
|---|---|---|---|
| B1319 | Driver Door Ajar Circuit Failure | SJB | GO to PINPOINT TEST E . |
| B1327 | Passenger Door Ajar Circuit Failure | SJB | GO to PINPOINT TEST E . |
| B1335 | RH Rear Door Ajar Circuit Failure | SJB | GO to PINPOINT TEST E . |
| B1342 | ECU Is Defective | SJB | CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved again, INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . CLEAR the DTCs. REPEAT the self-test. |
| B1571 | LH Rear Door Ajar Circuit Failure | SJB | GO to PINPOINT TEST E . |
| B2020 | Courtesy Lamp Output Circuit Short to Ground | SJB | GO to PINPOINT TEST D . |
| B2021 | Dome Lamp Output Return Circuit Short to Ground | SJB | GO to PINPOINT TEST B . |
| B2023 | Rear Courtesy Lamp Output Circuit Short to Ground | SJB | GO to PINPOINT TEST C . |
| B2024 | Rear Courtesy Lamp Output Return Circuit Failure | SJB | GO to PINPOINT TEST C . |
| B2025 | Demand Lamps Circuit Failure | SJB | GO to PINPOINT TEST H . |
| B2040 | Mirror Lamp Output Circuit Failure | SJB | GO to PINPOINT TEST D . |
| B2041 | Mirror Lamp Output Circuit Short To Ground | SJB | GO to PINPOINT TEST D . |
| B2077 | Liftgate Ajar Circuit Failure | SJB | GO to PINPOINT TEST E . |
| B2499 | Courtesy Lamp Output Failure | SJB | GO to PINPOINT TEST B . |
| B2550 | Dome Lamp Output Circuit Short To Ground | SJB | GO to PINPOINT TEST B . |
| B2554 | Dome Lamp Output Circuit Failure | SJB | GO to PINPOINT TEST B . |
| B2974 | Lighting Mode Switch Input Circuit Failure | SJB | GO to PINPOINT TEST J . |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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