Description and Operation of Body Control Systems
Body Control Systems: Description and Operation
SMART JUNCTION BOX (SJB) DIAGNOSIS
Principles of Operation
NOTE: Upon installation of a new smart junction box (SJB), the module must be reconfigured.
The SJB receives inputs and delivers outputs to a majority of the electronically-controlled features of the vehicle. The SJB constantly monitors the
systems under its control and reports a concern in the form of a diagnostic trouble code (DTC). The DTC can be retrieved with a diagnostic tool through
the ISO 9141 communication network. The SJB receives power input from the battery junction box (BJB), and controls the following features:
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front wiper and washer
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warning chime (SJB communicates information to the instrument cluster)
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battery saver
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illuminated entry and interior lighting
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driver one-touch down power window (optional)
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battery saver relay
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door ajar warning indicator lamp (SJB communicates information to the instrument cluster)
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remote keyless entry (RKE) (optional)
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power lock system (optional)
