Principles of Operation
Note. The time out for the battery saver relay and the accessory delay relay (both are controlled by the SJB) is 1 minute if the vehicle has less than 80 km (50 miles). Once the vehicle accumulates 80 km (50 miles), the time out for both relays will be 10 minutes, as described in the Owner's Literature. Refer to INTERIOR LIGHTING article for battery saver relay information. Refer to GLASS, FRAMES AND MECHANISMS article for accessory delay relay information.
Note. The smart junction box (SJB) is also known as the generic electronic module (GEM).
The SJB communicates via the medium speed controller area network (MS-CAN).
The SJB controls the power door lock system. The SJB monitors the door lock/unlock switch inputs from the interior door lock switches. When the SJB receives an unlock/lock command from any door lock control switch, the module activates the door lock actuators. Refer to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS article.
The SJB also controls the following remote lock/unlock features
- Remote keyless entry (RKE) transmitter lock/unlock
- Panic alarm
- Keyless entry keypad
The SJB receives inputs and provides outputs for the exterior and interior lighting, front and rear wipers, warning chimes/lamps, controls the anti-theft perimeter alarm and has an integrated tire pressure monitoring system (TPMS).
Normal Operation
The smart junction box (SJB) controls the output of several vehicle systems. When a repetitive fault causing a circuit overload is detected on any of the output circuits, the SJB disables the circuit by removing voltage, or ground, to the affected circuit. The circuit remains disabled until the fault is corrected and an on-demand self-test is run. After the on-demand self-test has been run, any DTCs related to the fault will be cleared.
DTC B106E sets when the SJB has disabled a circuit due to a repetitive fault causing a circuit overload. A corresponding DTC for the circuit in question will also set.
- DTC B106F (Module Disabled Due to External Fault) - sets when one or more output functions are permanently disabled due to a repetitive circuit overload fault. DTC B106F will be set with DTC B106E. When DTC B106F is present, a new SJB must be installed after the fault condition has been corrected.
This pinpoint test is intended to diagnose the following
- Output circuit short to ground or voltage
- SJB
If the SJB is not configured correctly, these DTCs may appear in error. The SJB will need to be configured correctly, possibly using the As-Built database, in order to correct this issue and clear the DTCs. Refer to MODULE CONFIGURATION article. If not, then the following pinpoint test will need to be carried out to determine if the SJB is at fault.
| DTC Description | Fault Trigger Conditions |
|---|---|
| B2048 - Left Rear Turn Lamp Circuit Short to Ground | Sets when the LR turn lamp circuit (on SJB C2280D-21) is shorted to ground. |
| B2050 - Right Rear Turn Lamp Circuit Short to Ground | Sets when the RR turn lamp circuit (on SJB C2280D-19) is shorted to ground. |
| B2949 - Global Opening/Closing Circuit Short to Battery | Sets when the global opening/closing circuit (on SJB C2280D-10) is shorted to battery. |
| B2A2B - Left Corner Lamp Output Circuit Short to Ground | Sets when the left corner lamp output circuit (on SJB C2280B-17) is shorted to ground. |
| B2A2C - Right Corner Lamp Output Circuit Short to Ground | Sets when the right corner lamp output circuit (on SJB C2280B-19) is shorted to ground. |
| B2A38 - Floor Lamp Output Circuit Short to Ground | Sets when the floor lamp output circuit (on SJB C2280G-2) is shorted to ground. |
Note. The pins mentioned above are not populated.
This pinpoint test is intended to diagnose the following
- SJB