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 MANUALSLINCOLN2008NAVIGATOR 4WD V8-5.4LREPAIR AND DIAGNOSISPOWER AND GROUND DISTRIBUTIONPOWER DISTRIBUTION MODULESERVICE AND REPAIR
2008 Lincoln Navigator 4WD V8-5.4L
Power Distribution Module: Service and Repair
2008 Lincoln Navigator 4WD V8-5.4LSECTION Service and Repair
SMART JUNCTION BOX (SJB)
Removal
CAUTION: Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage to the module may result.
NOTE: Prior to the removal of the module, it is necessary to upload the module configuration information to a scan tool. This information must be downloaded into the new SJB after installation.
1. NOTE:
- The tire pressure monitoring system (TPMS) functionality is integral to the SJB.
- This step is only necessary if the SJB is being replaced.
- A new SJB is delivered in a "manufacturing mode" with 7 pre-set DTCs. A successful configuration of the SJB, then a successful TPMS sensor training, then a successful self-test including the clearing of all DTCs is required in order to clear the 7 pre-set manufacturing mode DTCs. The 7 manufacturing mode DTCs are:
- B106D (Tire Pressure Monitor System [TPMS] Initiators Not Configured) This DTC is present when the SJB is not configured, even on applications that are not equipped with initiators.
- B2477 (Module Configuration Failure)
- B2868 (Left Front Tire Pressure Sensor Fault)
- B2869 (Right Front Tire Pressure Sensor Fault)
- B2870 (Right Rear Tire Pressure Sensor Fault)
- B2871 (Left Rear Tire Pressure Sensor Fault)
- C2780 (ECU in Manufacturer Sub-State)
Upload the module configuration information from the SJB into the scan tool.
2. Disconnect the battery.
3. Remove the pin-type retainer and the RH A-pillar lower trim panel.
4. Remove the glove compartment.
5. Disconnect the 7 electrical connectors.
6. Remove the 2 bolts and the SJB.
Installation
1. Position the SJB and install the 2 bolts.
- Tighten the bolts to 2 Nm (18 lb-in).
2. Connect the 7 electrical connectors.
3. Position the RH A-pillar lower trim panel and install the pin-type retainer.
4. Install the glove compartment.
5. NOTE: If the SJB is not being replaced, this is the last step that is necessary.
Connect the battery.
6. NOTE: When successful, this step provides the calibration necessary for the SJB operation and clears the DTCs B106D and B2477. The clearing of these DTCs indicates the calibration data has been successfully downloaded to the SJB.
Download the SJB configuration information from the scan tool to the SJB.
7. NOTE: When successful, this step clears DTCs B2868, B2869, B2870 and B2871. The clearing of these DTCs indicates the SJB has recognized the tire pressure sensors during the training procedure.
Train the tire pressure sensors.
8. NOTE: DTC C2780 will not clear if any of the pre-set DTCs are still present in the SJB.
Carry out the SJB on-demand self-test by clearing the DTCs and then retrieving the DTCs to confirm all DTCs have been cleared.
Removal
CAUTION: Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage to the module may result.
NOTE: Prior to the removal of the module, it is necessary to upload the module configuration information to a scan tool. This information must be downloaded into the new SJB after installation.
1. NOTE:
- The tire pressure monitoring system (TPMS) functionality is integral to the SJB.
- This step is only necessary if the SJB is being replaced.
- A new SJB is delivered in a "manufacturing mode" with 7 pre-set DTCs. A successful configuration of the SJB, then a successful TPMS sensor training, then a successful self-test including the clearing of all DTCs is required in order to clear the 7 pre-set manufacturing mode DTCs. The 7 manufacturing mode DTCs are:
- B106D (Tire Pressure Monitor System [TPMS] Initiators Not Configured) This DTC is present when the SJB is not configured, even on applications that are not equipped with initiators.
- B2477 (Module Configuration Failure)
- B2868 (Left Front Tire Pressure Sensor Fault)
- B2869 (Right Front Tire Pressure Sensor Fault)
- B2870 (Right Rear Tire Pressure Sensor Fault)
- B2871 (Left Rear Tire Pressure Sensor Fault)
- C2780 (ECU in Manufacturer Sub-State)
Upload the module configuration information from the SJB into the scan tool.
2. Disconnect the battery.
3. Remove the pin-type retainer and the RH A-pillar lower trim panel.
4. Remove the glove compartment.
5. Disconnect the 7 electrical connectors.
6. Remove the 2 bolts and the SJB.
Installation
1. Position the SJB and install the 2 bolts.
- Tighten the bolts to 2 Nm (18 lb-in).
2. Connect the 7 electrical connectors.
3. Position the RH A-pillar lower trim panel and install the pin-type retainer.
4. Install the glove compartment.
5. NOTE: If the SJB is not being replaced, this is the last step that is necessary.
Connect the battery.
6. NOTE: When successful, this step provides the calibration necessary for the SJB operation and clears the DTCs B106D and B2477. The clearing of these DTCs indicates the calibration data has been successfully downloaded to the SJB.
Download the SJB configuration information from the scan tool to the SJB.
7. NOTE: When successful, this step clears DTCs B2868, B2869, B2870 and B2871. The clearing of these DTCs indicates the SJB has recognized the tire pressure sensors during the training procedure.
Train the tire pressure sensors.
8. NOTE: DTC C2780 will not clear if any of the pre-set DTCs are still present in the SJB.
Carry out the SJB on-demand self-test by clearing the DTCs and then retrieving the DTCs to confirm all DTCs have been cleared.
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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.