Power Distribution Module: Service and Repair
Smart Junction Box (SJB)
Removal
NOTICE: 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. In the event that As-Built data entry is required (the Smart Junction Box (SJB) will not communicate), all Remote Keyless Entry (RKE) devices must be programmed to the new SJB. A minimum of 2 devices are necessary to complete the configuration and turn off the flashing interior lights.
NOTE: The Tire Pressure Monitoring System (TPMS) functionality is integrated into the SJB.
NOTE: 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 8 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:
- B106D (Tire Pressure Monitor System [TPMS] Initiators Not Configured)
- 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)
- B2A21 (One or More Configuration Files Missing or Corrupt)
- 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 tab 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, B2477 and B2A21. The clearing of these DTCs indicates the calibration data has been successfully downloaded to the new SJB.
NOTE: The RKE transmitter portion of the Integrated Keyhead Transmitter (IKT) key is automatically transferred during Programmable Module Installation (PMI). Passive Anti-Theft System (PATS) programming is not necessary. If As-Built data is required during PMI, all (IKT or fob) remote transmitters must be programmed to the new SJB. Cycling the ignition to run for 6 seconds with each IKT will program the RKE function of the IKT key.
NOTE: DTC B2276 may be set, indicating there are less than 2 transmitters programmed to the SJB.
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 self-test (must include an on-demand self-test) and then repeat the self-test to confirm all DTCs have been cleared.
9. Rotate the instrument panel dimmer switch from the full dim position to the dome ON position. This dimmer switch rotation is a calibration procedure for the SJB dimmer switch input and will make sure that all displays are visible under all lighting conditions.