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 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. For additional information, refer to Module Configuration [1][2]Initial Inspection and Diagnostic Overview.

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. For additional information, refer to Module Configuration [1][2]Initial Inspection and Diagnostic Overview.

2. Disconnect the 7 electrical connectors.

3. Lift the SJB locking tab outward and slide the SJB upward to disengage it from the SJB bracket.

Installation

1. Position the SJB into the 3 keyholes of the SJB bracket and slide it downward until the SJB locking tab snaps into place.

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

Connect the 7 electrical connectors.

3. 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 is 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 Panel Cluster (IPC) was installed, the IKT keys must be programmed to the new IPC. For additional information, refer to Anti-Theft - Passive Anti-Theft System (PATS) Programming and Relearning.

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 [1][2]Initial Inspection and Diagnostic Overview.

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

5. NOTE: DTC C2780 cannot be cleared if any other DTCs are present in the SJB. When successful, this step clears 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.