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.
2005 Mercury MontereyFACTORY OEM SERVICE PROCEDURE
Interior Lighting
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. |
| B1577 | 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 B . |
| 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 . |
| 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 . |
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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