Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Principles of Operation

PRINCIPLES OF OPERATION

NOTE: Upon installation of a new smart junction box (SJB), the module must be reconfigured. Refer to Information Bus (Module Communications Network) prior to SJB removal.

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 medium speed controller area network (CAN) communication network.