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.
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HOMESERVICE MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 394 (WARNING SYSTEM)DIAGNOSIS AND TESTINGWARNING DEVICESINSPECTION AND VERIFICATION
2010 Mercury Mariner Hybrid, AWD
Inspection and Verification
2010 Mercury Mariner Hybrid, AWDSECTION Inspection and Verification
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the customer concern.
- Visually inspect for obvious signs of electrical damage.VISUAL INSPECTION CHART
Electrical - Circuitry
- Key-in-ignition warning switch (part of the ignition switch)
- Instrument cluster
- Smart junction box (SJB)
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.
- If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
- Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- CAN or ISO circuit fault; all electronic control units no response/not equipped, refer to MODULE COMMUNICATIONS NETWORK .
- No response/not equipped for instrument cluster, refer to INSTRUMENT CLUSTER . For the SJB, refer to MULTIFUNCTION ELECTRONIC MODULES .
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the SJB.
- If the DTCs retrieved are related to the concern, go to the SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
- If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .
SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX
| DTC | Description | Source | Action |
|---|---|---|---|
| B1319 | Driver Door Ajar Switch/Circuit Failure | SJB | REFER to INTERIOR LIGHTING . |
| B1327 | Passenger Door Ajar Circuit Failure | SJB | REFER to INTERIOR LIGHTING . |
| B1335 | Door Ajar - Right Rear (RR) Switch/Circuit Failure | SJB | REFER to INTERIOR LIGHTING . |
| B1342 | ECU is Defective | SJB | INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation. |
| B1352 | Ignition Key-In Circuit Failure | SJB | GO to PINPOINT TEST B . |
| B1519 | Hood Ajar Switch/Circuit Failure | SJB | GO to PINPOINT TEST A . |
| B1571 | Door Ajar - Left Rear (LR) Switch/Circuit Failure | SJB | REFER to INTERIOR LIGHTING . |
| B2077 | Liftgate (Tailgate) Ajar Switch/Circuit Failure | SJB | REFER to INTERIOR LIGHTING . |
| C1769 | Park Brake Switch/Circuit Short-to-Ground | SJB | REFER to INSTRUMENT CLUSTER . |
| All other DTCs | - | SJB | REFER to MULTIFUNCTION ELECTRONIC MODULES . |
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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.