Body Control Systems: 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 into the appropriate scan tool. This information must be downloaded into the new module after installation. For additional information, refer to Information Bus.

NOTE: The Tire Pressure Monitoring System (TPMS) functionality is integral to the Smart Junction Box (SJB).

NOTE: The steps included in the SJB removal and installation procedure are critical to restoring the tire pressure monitoring system to normal operation. A new SJB is delivered in a manufacturing mode with 7 pre-set TPMS 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)
- 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. For additional information, refer to Information Bus.

2. Remove the RH kick panel trim panel.

3. Disconnect the electrical connectors.

4. Remove the 3 screws and the SJB.

Installation

NOTE: When a new SJB is installed, all customer Remote Keyless Entry (RKE) transmitters may be required to be present in order to program the RKE transmitters to the new SJB.

1. Install the SJB.
- Install the 3 screws.

- Connect the electrical connectors.

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

Install the RH lower cowl trim panel.

3. 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.

NOTE: When successful, this step also programs the remote transmitters into the new SJB. In the event the remote transmitters do not program to the new SJB, all of the remote transmitters need to be present. Refer to Doors, Hood and Trunk &/or Locks, Remote Keyless Entry Transmitter Programming. This action programs the remote transmitters into the new SJB.

Download the SJB configuration information from the scan tool into the new SJB. For additional information, refer to Information Bus. Testing and Inspection

4. 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.

5. NOTE: DTC C2780 does not clear if any other DTCs are present in the SJB. When successful, this step clears DTC C2780.

Carry out the SJB self-test (must be an on-demand) by clearing DTCs, and then retrieving DTCs to confirm all DTCs have been cleared.