Power Distribution Module: Service and Repair

Smart Junction Box (SJB)

NOTE: Steering column opening cover shown removed for clarity.










Removal

NOTICE: Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage to the module may result.

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. In the event that As-Built data 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.

NOTE: A new SJB is delivered in a "manufacturing mode" with 7 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 7 manufacturing mode DTCs. The 7 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)
- 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.

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: When successful, this step provides the calibration necessary for the SJB operation and clears the DTCs B106D and B2477. The clearing of these DTCs indicates the calibration data has been successfully downloaded to the SJB.

NOTE: DTC B2276 may be set, indicating there are less than 2 transmitters programmed to the SJB.

NOTE: If the configuration information download is unsuccessful, DTC B2A21 sets. As-Built data may need to be obtained and manually entered into the new SJB.

Download the SJB configuration information from the scan tool to the SJB.

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.

5. 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.

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.