Body Control Systems: Service and Repair

Smart Junction Box (SJB)

NOTE: Steering column opening cover removed for clarity.











Removal

NOTE: Prior to the replacement of the module, it is necessary to upload the module configuration information to a scan tool. This information must be downloaded into the new Smart Junction Box (SJB) after installation. For additional information, refer to Module Configuration Testing and Inspection. In the event that As-Built data entry is required (SJB does 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: A new SJB is delivered in a "manufacturing mode" with 8 pre-set DTCs. A successful configuration of the SJB, then a successful TPMS sensor training, then a successful self-test including the clearing of all DTCs is required in order to clear the 8 manufacturing mode DTCs. The 8 manufacturing mode DTCs are:
- B106D (Tire Pressure Monitor System [ TPMS] Initiators Not Configured) This DTC is present when the SJB is not configured, even on applications that are not equipped with initiators.
- 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 only necessary if the SJB is being replaced.

Upload the module configuration information from the SJB into the scan tool. For additional information, refer to Module Configuration Special Tool(s) Used With Diagnostics.

2. Disconnect the 7 electrical connectors.

3. Remove the 3 nuts and the SJB.

Installation

1. Position the SJB and install the 3 nuts.
- Tighten to 5 Nm (44 lb-in).

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

Connect the 7 electrical connectors.

3. NOTE: DTC B2276 may be set, indicating there are less than 2 transmitters programmed to the SJB. For additional information, refer to Handles, Locks, Latches and Entry Systems Testing and Inspection

Download the SJB configuration information from the scan tool to the SJB. For additional information, refer to Module Configuration Special Tool(s) Used With Diagnostics.

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.

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.

6. Rotate the instrument panel dimmer switch from the full dim position to the dome ON position. This makes sure that all the displays are visible under all lighting conditions.