Pinpoint Test A: DTCs B106E, B106F
Smart Junction Box (SJB)
Pinpoint Tests
Pinpoint Test A: DTCs B106E, B106F
Normal Operation
The Smart Junction Box (SJB) controls the output of several vehicle systems by means of solid state drivers. When a repetitive fault causing a circuit overload occurs on any of these drivers is detected on any of the output circuits, the SJB disables the circuit by removing voltage, or ground, to the affected circuit and a DTC is set. 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 are cleared. The module also tracks the number of repetitive faults on each of these circuits. The module compares this number of overloads to 3 progressive thresholds established for each circuit. If the 3 thresholds have not been exceeded, then the DTC of the affected circuit can be cleared by eliminating the fault, then clearing the DTCs and running the self-test. At the point that each of the first 2 thresholds are exceeded, DTC B106E sets along with the DTC relating to the affected circuit. Once the final threshold has been exceeded, the affected output is permanently disabled, and DTC B106F sets along with DTC B1342, at which time the SJB must be replaced.
- DTC B106E (Module Output Pin Disabled To Protect From External Fault) - sets when the SJB has temporarily disabled a circuit due to a repetitive fault causing a circuit overload. A corresponding DTC for the circuit in question is 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 sets with DTC B106E. When DTC B106F is present, a new SJB must be installed after the fault condition is corrected.
This pinpoint test is intended to diagnose the following:
- Output circuit short to ground or voltage
- SJB
PINPOINT TEST A: DTCs B106E, B106F
NOTICE: If DTC B106F is present and the Smart Junction Box (SJB) is being replaced, the fault condition must be corrected first. Failure to correct the fault condition first may cause damage to the new SJB, resulting in a repeat repair.
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A1 CHECK FOR DTC B106E
- Review the DTCs from the SJB self-test.
- Is DTC B106E present?
Yes
GO to A2.
No
GO to A3.
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A2 CHECK FOR OTHER DTCs
- Review the DTCs from the SJB self-test.
- Are any SJB DTCs present other than DTC B106E?
Yes
CORRECT any other DTCs. REFER to Diagnostic Trouble Code (DTC) Chart Diagnostic Trouble Code (DTC) Chart. REPEAT the self-test (on-demand DTCs).
No
CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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A3 CHECK FOR DTC B106F
- Review the DTCs from the SJB self-test.
- Is DTC B106F present?
Yes
CORRECT any other DTCs. REFER to Diagnostic Trouble Code (DTC) Chart Diagnostic Trouble Code (DTC) Chart. INSTALL a new SJB. REFER to Smart Junction Box (SJB) Smart Junction Box (SJB). TEST the system for normal operation.
No
The system is operating correctly at this time. The concern was caused by a fault in one of the output circuits.
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