Smart Junction Box (SJB)
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 Smart Junction Box (SJB), it is necessary to upload the module configuration information to the appropriate scan tool. This information must be downloaded into the new SJB after installation. For additional information, refer to Information Bus. In the event that As-Built data entry is required (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.
1. NOTE: This step is necessary only if the SJB is being replaced.
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. 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)
Upload the module configuration information from the SJB. For additional information, refer to Information Bus.
2. Remove the passenger cowl side trim panel.
3. NOTE: The upper 12A581 harness SJB (B+) connector may be more easily removed after the SJB bolts are removed and the SJB can be positioned lower and away from the body in order for the connector release tangs to be accessed and pressed.
Disconnect the 7 SJB electrical connectors.
4. Remove the in-line connector push-pin from the SJB.
5. Remove the 2 bolts and the SJB.
Installation
1. Install the 2 bolts and the SJB.
- Tighten to 2 Nm (18 lb-in).
2. Install the in-line connector push-pin on the SJB.
3. Connect the 7 SJB electrical connectors.
4. NOTE: If the SJB was not replaced, this is the last step that is necessary.
Install the passenger cowl side trim panel.
5. 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: DTC B2276 may set, indicating there are less than 2 transmitters programmed to the SJB. For additional information, refer to Doors, Hood and Trunk &/or Locks.
Download the SJB configuration information from the scan tool. For additional information, refer to Information Bus.
6. 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. For additional information, refer to Wheels and Tires.
7. NOTE: DTC C2780 will not clear if any other DTCs are present in the SJB. When successful, this step clears DTC C2780.
Carry out the SJB on-demand self-test. All SJB issues must be resolved before DTC C2780 clears. Repeat the self-test to confirm all DTCs have been cleared.
8. Rotate the instrument panel dimmer switch from the full dim position to the dome ON position. This makes sure that all displays are visible under all lighting conditions.