Electrical System Architecture

The XJ Series Sedan system "architecture" incorporates two data networks: a controller area network (CAN) for the engine, drive train and related systems, and a standard corporate protocol network (SCP) for the body systems. Any vehicle subsystem depicted on the figures with the CAN or SCP included uses data derived from the network or transmits data via the network to achieve control. Messages for both networks are cataloged at "CAN and SCP Network Messages". CAN and SCP Network Messages

When appropriate, the user will be referred to these messages by a note in the diagram or in the diagram legend. In addition to the two networks, the XJ seris uses a serial data bus (ISO) for diagnostics and for the programming of certain control modules.

The XJ Series uses both power and logic grounds; however, it does not use a common logic ground stud connection as in previous Sedan vehicles.