Principles of Operation: Notes
WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The smart junction box (SJB) is also known as the generic electronic module (GEM).
Vehicle communication utilizes both International Standards Organization (ISO) 9141 and controller area network (CAN) communications. ISO 9141 is for diagnostic use only, and CAN is a method for transferring data among distributed electronic modules via a serial data bus.
The vehicle is equipped with 3 module communication networks:
- ISO 9141
- Medium speed (MS) CAN
- High speed (HS) CAN