Power Distribution Module: Service and Repair

Smart Junction Box (SJB)













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 removal of the module, it is necessary to upload the module configuration information to the appropriate scan tool. This information needs to be downloaded into the new module once installed.

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

NOTE: A new SJB is delivered in a "manufacturing mode" with 7 pre-set DTCs. In order to clear the 7 pre-set manufacturing mode DTCs, the following must occur:
- A successful configuration of the SJB.
- A successful TPMS sensor training.
- A successful self-test including the clearing of all DTCs.

NOTE: The DTC B106D is present when the SJB is not configured, even on applications that are not equipped with initiators.
- The 7 manufacturing mode DTCs are:
- 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 only necessary if the SJB is being replaced.

Upload the module configuration information from the SJB into the scan tool.

2. Disconnect the 6 electrical connectors.

3. Remove the 2 nuts and the SJB.

Installation

1. Position the SJB and install the 2 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 6 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: If the Programmable Module Installation (PMI) procedure was not followed when a new SJB was installed, the Remote Keyless Entry (RKE) function (from the Integrated Keyhead Transmitter (IKT)) of the SJB must be programmed, or the IKT RKE functions will be inoperative. IKTs can be programmed to the new SJB by cycling each IKT key to the ON position for a minimum of 6 seconds. If a new Instrument Cluster (IC) was installed, the IKT keys must be programmed to the new IC.

NOTE: DTC B2276 may be set, indicating there are less than 2 transmitters programmed to the 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. When successful, this step will clear the DTC C2780.

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