Communications Network (G1921200): Overview

WARNING: This page is about a different car, the 2023 Jaguar F-Pace and 2022 Jaguar F-Pace. However, it is still accessible from the selected car via links, so may be relevant.

A number of different types of communication networks are incorporated into the vehicle wiring harnesses for the transmission of commands and information between control modules. The configuration installed on a particular vehicle depends on the model and equipment level.

NOTE: The control diagrams shown in this article are schematics reflecting communications networks fitted to Right Hand Drive (RHD) vehicles only. For detailed layouts of the various communications networks fitted to Right Hand Drive (RHD) and Left Hand Drive (LHD) vehicles refer to the appropriate service information.

Local Interconnect Network Bus

The Local Interconnect Network (LIN) bus is a low speed broadcast network that employs master and slave components. The master component transmits a message along a single wire to the slave components identifying which slave is to respond. The message has a header (slave identifier) and an empty data field. The identified slave component fills the data field with the relevant information and returns a message to the master component along the same wire.

Controller Area Network Bus

The Controller Area Network (CAN) bus is a high speed broadcast network where control modules automatically transmit information every few milliseconds. Information is broadcast down a pair of twisted wires, known as 'CAN high' and 'CAN low'. Information is transmitted on the CAN bus as a voltage difference between the 2 wires.

Flexray Bus

The FlexRay system connects modules using a similar system to CANbus. Information is broadcast down a pair of twisted wires known as 'Bus Plus (BP)' and 'Bus Minus (BM)'. Information is transmitted on the CAN bus as a voltage difference between the 2 wires. This eliminates the problem of induced voltages in the wires from other electrical devices. FlexRay consists of an Active Star hosted in the Body Control Module/Gateway Module (BCM/GWM) with up to 8 branches. Modules are connected to the branches as either pass-through or terminating nodes. FlexRay is deterministic and requires synchronisation to function.

Private Bus

The Private Bus networks are a local bus for a system, either connecting 2 modules, or a small number of modules. Information is broadcast down a pair of twisted wires, known as 'CAN high' and 'CAN low'. Information is transmitted on the CAN bus as a voltage difference between the 2 wires.

The communications networks available on the vehicle are shown below:

High Speed (HS) Controller Area Network (CAN) chassis systems bus
HS CAN body systems bus
HS CAN Human Machine Interface (HMI) systems bus
HS CAN power mode zero systems bus
HS CAN powertrain systems bus
Flexray bus
Local Interconnect Network (LIN)
Private CAN Bus