Power Distribution Module: Service and Repair

SMART JUNCTION BOX (SJB)







Removal

CAUTION: Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage 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.
- A new SJB is delivered in "manufacturing mode" with 7 pre-set DTCs. These 7 manufacturing mode DTCs require that a successful configuration of the SJB occurs, then a successful TPMS sensor training occurs, then a successful self-test occurs, including the clearing of all DTCs. All of this is required in order to clear the 7 manufacturing mode DTCs. The 7 manufacturing mode DTCs are as follows:
- B2477 (Module Configuration Failure)
- 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.
- 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 screws 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. Connect the battery.

6. NOTE: When successful, this step provides the calibration necessary for the SJB operation and clears DTCs B2477 and B106D. The clearing of these DTCs indicate 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 other DTCs are present in the SJB.

Carry out the SJB on-demand self-test by clearing DTCs and then retrieving DTCs to confirm all DTCs have been cleared.