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Power Distribution Module: Service and Repair

SMART JUNCTION BOX (SJB)


Special Tool(s):






Special Tool(s)







Removal

CAUTION: Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result.

NOTE:
- Prior to the replacement of the module, it is necessary to upload the module configuration information to the appropriate scan tool. This information must be downloaded into the new module after installation.
- The tire pressure monitoring system (TPMS) functionality has been integrated into the SJB.
- The steps included in the SJB removal and installation procedure are critical to restoring the vehicle security and tire pressure monitoring systems to normal operation. A new SJB is delivered in a manufacturing mode with 7 pre-set DTCs related to the TPMS. To clear the DTCs, successful configuration of the SJB must occur, followed by successful TPMS sensor training, and a successful self-test, including clearing of the DTCs. The DTCs are as follows:
- B2477 (Module Configuration Failure)
- B106D (Tire Pressure Monitor System [TPMS] Initiators Not Configured)
- 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)

1. NOTE: This step is necessary only if the SJB is being replaced.

Upload the module configuration information from the SJB into the scan tool.

2. Remove the driver door scuff plate.
3. Disconnect the 6 electrical connectors.
4. Remove the harness pushpin from the SJB.
5. Remove the nut.
6. Lower the SJB (release the SJB from the 2 alignment holes).
7. Push the red lock upward and press the 2 black tangs inward to release the B+ connector from the SJB.
8. Remove the SJB.

Installation
1. Install the B+ connector onto the SJB and push the red lock tab downward.
2. Position the 2 SJB alignment tabs into the 2 holes and install the nut.
- Tighten to 5 Nm (44 lb-in).

3. Install the harness pushpin into the SJB.
4. Connect the 6 electrical connectors.

5. NOTE: If the SJB was not replaced, this is the last step that is necessary.

Install the driver door scuff plate.

6. NOTE:
- When successful, this step provides the calibration necessary for the SJB operation and clears DTCs B106D and B2477. The clearing of these DTCs indicates the calibration data has been successfully downloaded to the new SJB.
- If the programmable module installation (PMI) procedure was not followed when a new SJB was installed, the remote keyless entry (RKE) function (from the integrated keyhead transmitter [IKT]) of the SJB must be programmed, or the IKT RKE functions will be inoperative. IKTs can be programmed to the new SJB by cycling each IKT key to the ON position for a minimum of 6 seconds. If a new instrument cluster was installed, the IKT keys must be programmed to the new instrument cluster in order to program both the RKE and passive anti-theft system (PATS) functions.

Download the SJB configuration information from the scan tool to the new 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, clear DTCs, and then retrieve all DTCs to confirm all DTCs have been cleared.
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