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 Module Configuration Testing and Inspection.

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 Module Configuration Testing and Inspection.

2. Remove the RH kick panel trim panel. For additional information, refer to Interior Trim and Ornamentation Interior Trim - Exploded View.

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. For additional information, refer to Interior Trim and Ornamentation Interior Trim - Exploded View.

3. 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 Handles, Locks, Latches and Entry Systems Testing and Inspection, 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 Module Configuration Programming and Relearning.

4. Train the tire pressure sensors. For additional information, refer to Wheels and Tires Tire Pressure Monitoring System (TPMS) Sensor Training.

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.