Jaguar XJ - Manual (Page 2)

1 DATE OF ISSUE: SEPTEMBER 1997
XJ Series 1998 Introduction
Electrical Guide Format
This Electrical Guide is made up of two major sections. The first section, at the front of the book, provides general information
for and about the use of the book, and information and illustrations to aid in the understanding of the XJ Series electrical / elec-
tronic systems, as well as the location and identification of components.
The second section includes the Figures, which are the basis of the book. Each Figure is identified by a Figure Number
(i.e. Fig. 01.1) and Title, and is accompanied by a page of data containing information specific to that Figure.
It is recommended that the user read through the front section of the book to develop a familiarity with the layout of the
book and with the system of symbols and abbreviations used. The Table of Contents on the following pages should help
to guide the user.
Standard Abbreviations
The following abbreviations are used throughout this Electrical Guide:
B+ Battery Voltage
CAN Controller Area Network
DI Direction Indicator
LH Left-Hand
LHD Left-Hand Drive
LWB Long Wheelbase
N/A Normally Aspirated
NAS North American Specification
RH Right-Hand
RHD Right-Hand Drive
ROW Rest of World
SC Supercharged
SCP Standard Corporate Protocol Network
VIN Vehicle Identification Number
Refer to the Vehicle Service Manual for a glossary of standard terms and their abbreviations.
Vehicle Identification Numbers (VIN)
VIN ranges are presented throughout the book in the following manner:
➞
VIN 123456 indicates “up to VIN 123456”; VIN 123456
➞
indicates “from VIN 123456 on”.
XJ Series Electrical System Architecture
The 1998 Model Year XJ Series uses an advanced electrical system architecture which features “multiplexing”, first
introduced in Jaguar vehicles with the XK8. Multiplexing allows for simplified wiring harnesses while providing greater
flexibility in programming market variants. Two data networks are used in the system: 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 in the Appendix of this
book. When appropriate, the user will be referred to the Appendix by a note on the Data page. In addition to the two networks,
the XJ Series uses two serial data buses (ISO) for diagnostics, for the security system 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.