Power Distribution Module: Service and Repair

SMART JUNCTION BOX (SJB)







Removal

CAUTION:
- If the smart junction box (SJB) is dropped, damage to the internal components may occur. A new SJB must be installed.
- 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 to the scan tool. This information must be downloaded into the new module after installation.
- The tire pressure monitoring system (TPMS) functionality is integral to the SJB.
- 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 7 pre-set DTCs related to the TPMS. 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.

2. Remove the steering column cover.
3. Disconnect the 6 SJB electrical connectors.
4. Remove the 2 harness pushpins from the SJB.
5. Using a suitable tool, lift the SJB release tab (away from the SJB bracket), slide the SJB (wiggling it to the left) and remove.
6. Disconnect the SJB B+ connector.
7. If necessary, remove the 3 nuts and the SJB bracket.

Installation

1. NOTE: Align the SJB bracket to the upper 2 mounting studs, then rotate the bracket onto the lower mounting stud.

If necessary, install the 3 nuts and the SJB bracket.
- Tighten to 5 Nm (44 lb-in).

2. Install the SJB.
- Connect the SJB B+ connector.
- Locate the SJB into the 3 tabs and slide the SJB (to the right) to engage the SJB release tab into the SJB bracket.
- Connect the 6 electrical connectors.
- Install the 2 harness pushpins into the SJB.

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

Install the steering column cover.

4. 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.
- When successful, this step also programs the remote transmitter portion of the integrated keyhead transmitter (IKT) keys into the new SJB. In the event the IKTs (remote transmitter portion only) do not program to the new SJB, cycle each IKT key to the ON position for a minimum of 6 seconds. This action will program the remote transmitter portion of the IKT key into the new SJB.

Download the SJB configuration information from the scan tool.

5. 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.

6. NOTE: DTC C2780 will not clear if any of the pre-set DTCs are still present in the SJB. When successful, this step will clear the DTC C2780.

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