Power Distribution Module: Service and Repair
Smart Junction Box (SJB)
Removal
NOTICE: If the Smart Junction Box (SJB) is dropped, damage to the internal components may occur. A new SJB must be installed.
NOTICE: 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. In the event that As-Built data is required (the 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 integral to the SJB.
NOTE: On vehicles equipped with Intelligent Access (IA), if the SJB is being replaced, the keyless entry keypad code in the new SJB must be copied into the Remote Function Actuator (RFA) module. For additional information, refer to Keyless Entry Keypad Code Programming in Locks. Testing and Inspection
NOTE: The steps included in the SJB removal and installation procedure are critical to restoring the vehicle security and the TPMS 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 opening trim panel.
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+ (battery lead, part of the 14290 harness) 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+ (battery lead, part of the 14290 harness) 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 opening trim panel.
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.
NOTE: The RKE transmitter portion of the Integrated Keyhead Transmitter (IKT) key is automatically transferred during Programmable Module Installation (PMI). Passive Anti-Theft System (PATS) programming is not necessary. If As-Built data is required during PMI, all (IKT or fob) remote transmitters must be programmed to the new SJB. Cycling the ignition to run for 6 seconds with each IKT will program the RKE function of the IKT key.
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.
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 self-test (must include an on-demand self-test) and then repeat the self-test to confirm all DTCs have been cleared.
7. Rotate the instrument panel dimmer switch from the full dim position to the dome ON position to calibrate the switch. This will make sure that all displays are visible under all lighting conditions.