S-Type (X200) V8-4.2L (2005)
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Vehicles Built 02/2004 Onwards - Part 2
Principles of Operation
Communications Network - VIN Range: M45255->N52206
Principles of Operation
The vehicle has four module communication networks. Only three of these networks are connected to the diagnostic connector. The standard corporate
protocol (SCP) and controller area network (CAN), which are an unshielded twisted pair cable: data bus plus and data bus minus and the International
Standard Organization (ISO) 9141 communication network, which is a single wire network. The digital data bus (D2B), which is a fibre optic ring
network can only be accessed through the SCP network. The SCP, CAN and ISO networks can be connected to the Jaguar Approved Diagnostic System
by one connector called the diagnostic connector. This makes troubleshooting these systems easier by allowing one smart tester to be able to diagnose
and control any module on the three networks from one connector. Diagnosis of the D2B network is through the entertainment system audio unit. The
diagnostic connector is located on the driver's side, under the instrument panel.
The ISO 9141 communications network does not permit inter-module communications. When the Jaguar Approved Diagnostic System communicates to
modules on the ISO 9141 communication network, the diagnostic system must ask for all information; the modules initiate communications.
