Jaguar XJ-S
Schematic Drawings
http://www.skjagtech.co.uk
1975 -1991
Pre facelift models
Document dated 15-May-2006
Copyright (c) S&K Jagtech (skjagtech.co.uk) 2005
Contents
Head, Side lights 3
Fog light 3
Headlamp wash wipe 4
Cruise Control 4
Wash wipe 5
Radio 6
Merlin and Hirschmann 6
Boot lights 6
Flasher indicators 7
Window lift 7
Interior Lights 8
Bulb failure 8
Door Lock/Unlock Lucas 9
Door Lock/Unlock Kiekerk 9
Small items 10
Trip Computer 11
Intruments 11
Electrically operated door mirrors 12
Heated backlight 12
Heated Drivers Seat and Lumbar control 13
Quad headlamps 13
Boot Lock/Unlock 14
TWR/JaguarSport Ariel Arrest 14
Jaguar XJ-S Window Lift with 4 relay upgrade and Negitive rest 15
Jaguar XJ-S Wiper under relay control 16
DISCLAIMER
Should you decide to undertake work on any system covered in these documents, SK Jagtech accept no
liability for damage to the vehicle or personal injuries however caused. The information in this
document is provided to help explain and provided reference material.
We are geared up with the right equipment and have trained knowledgeable staff who can perform
maintenance and fault finding on your Jaguar and it is recommend that you leave any technical work
to a suitable specialist firms if you are in any way unsure of a procedure. You are always welcome
to contact us for advice.
Jaguar XJ-S Head, Side and Fog light Schematic
N
Terminal post
U
Headlamp inhibit relay
Main
Switch
N
U/R
R/U
R/O
Latched
U
Dip
Fog lamp
Fuse 1
warning
lamp Main
Fog lamp switch
Headlamp
flash
Fuse 5
Main relay
R/H
R/H
R/Y
Front Fog lamps
Dip Beam
L/H
Fuse 3
L/H
R/H
R/U
Rear Fog Lamps
Main beam
Fuse 4
warning
R/H
L/H
lamp
U/W
Main Beam
Fuse 2
L/H
Cigar lighter
Fibre Optic Lamp
Generic Diagram
Panel Lamps
Gearbox selector
Alternative to
computer harness
if fitted
Different models are cabled
Fuse 7
Switch and Rheostat differently and therefore this
Clock Lamps
diagram is a generic curcuit
that should help trace a fault.
Side marker
As data becomes available
NAS
Fuse 15
we will add additional diagrams
Bulb failure
F parking R/H
unit front
to cover the differences in
Side marker
switch gear extra
NAS
Fuse 14
F parking L/H
Rear lamp in-line fuse Bulb failure
To Caravan Socket
Rear tail unit left rear
L/H
No plate
Rear lamp in-line fuse
Bulb failure
Rear tail
To Caravan Socket
unit right rear
R/H Warning lamp blocking diodes
To Stop lamp
No plate
failure unit
Bulb Failure lamp
3
Jaguar XJ-S Headlamp wash wipe and Cruise Control Schematic
Wash Wipe Relay
U
LG
Windscreen
Washer Pump
LGU
Wiper Motor Right
Washer switch
Diode Pack
Pektron Blue
LG
1 3
2
4
5
Headlight
washer
pump
UR To headlight
Dip beam
Wiper Motor Left BW To headlight
main beam
Bellows and actuator solenoid valves
BG YO
YW
Brake Operated switch
Y YO
BR GP
Control Switch
Fuse 17
LGY G
YW
YW
Speed Control
YB
YB
Interface ECU
NW BS
To fuse 4
via control
N
module in
Boot/trunk
harness
G Transducer
B
N
Inhibit Switch
YP
NB
Kickdown Solenoid
NY BK BW B
Kickdown Switch
LGW
G To fuse 5
Set Switch
B
4
Jaguar XJ-S wash wipe and heated backlight Schematic
Switch Schematic explained
A Intermittent/
A
This is a Jaguar idea here (don t blame us)
flick wipe 7-3-1 & 5-6
The black lines A, B, C and D are used to
show which contacts 1-7 are conected in
B Fast Wipe 1-4 & 27
B which ever mode is in use.
For example
C Slow Wipe 1-5 & 2-7
Slow=1-5 and 2-7 Fast=1-4 and 2-7
Below are two other variations 1 designed by us
D Off 1-7 and 5-6
C
which are provided to get the point across
D
2 7 3 1 4 5 6
BLG
WLG
RLG
ULG
OLG
Wiper Motor
Run
Park
Fuse 9
LG
Fast
Off/Park
Off/Park W/LG W/LG
U/LG U/LG
R/LG R/LG
B/LG B/LG
Slow K/LG K/LG
LG LG
B B
LG/B LG/B
Slow
Intermitant
Fast
W/LG W/LG
U/LG U/LG
R/LG R/LG
B/LG B/LG
Intermitant
K/LG K/LG
LG LG
B B
LG/B LG/B
5
Delay Unit
Jaguar XJ-S Radio, Merlin and Hirschmann Aerial Schematic
Merlin Style Electric Aerial
WK In Line Fuse
Radio - CD/Tape
WK
Clock where fitted
UW
3 Aerial
4
Delay relay unit
1
UR
5
2
NP
BS
Boot Lights
Omiting Mast Delay
For those who don t want the 10 sec delay for the
86
87a mast to retract or who have a faulty delay module:
86
Substitute with a change over relay (Part no REL7DB
87a
available from us) and wire it in as per the relay
87
schematic shown in fig 1. Note that the pin configuration
85
87
is different on a standard ISO relay than on the Lucas
85
delay module, fig 2.
Fig 1 Fig 2 Lucas with
ISO numbering
Hirschmann Style Electric Aeriel
WK In Line Fuse
Radio - CD/Tape
WK
Clock where fitted
W/O
3 Aerial
5
1
P
4
2
Delay relay unit
NP
BS
Boot Lights
Omiting Mast Delay
For those who don t want the 10 sec delay for the
86
86 87a mast to retract or who have a faulty delay module:
Substitute with a change over relay (Part no REL7DB
87a 87
available from us) and wire it in as per the relay
schematic shown in fig 1. Note that the pin configuration
85
87
is different on a standard ISO relay than on the Lucas
85
delay module, fig 2.
Fig 1 Fig 2 Lucas with
No connection
ISO numbering
6
30/51
30/51
30/51
30/51
Jaguar XJ-S Flasher indicators and window lift Schematic
Acoustic unit
LGU LGP
NO Fuse 2
Flasher Unit
To terminal post
LGU
Hazard Switch
G
To fuse 5
Blocking diode
GN
LGN
GW
LH Warning Lamp
Blocking diode
LGB
RH Warning lamp
Flasher Switch
Hazard warning lamp
LH repeater
RH repeater
LH Rear indicator
RH Rear indicator
B
B
LH Front indicator
RH Front indicator
Caravan Socket Caravan Socket
LH Window motor RH Window motor
RG GR RU GU
LH Window lift switch RH Window lift switch
1 2 1 2
3 3
6 6
7 8 7 8
B
B
NU
Window Lift relay
WK B
To Ignition
Thermal Switch
NU
NU
N
To Terminal post
Up Rest Down
Pins 1&3 - Pins 1&3 + Pins 1&3 +
Pins 2&6 + Pins 2&6 + Pins 2&6 -
1 2 1 2 1 2
Switch motion and yes for some bizare reason
3 3 3 known only to the engineers at Lucas the motor
is live on both sides at rest.
6 6 6
7 8 7 8 7 8
7
UNKNOWN
Jaguar XJ-S Interior Lights and Bulb failure Schematic
PG
PWS
Map Light Switch Interior Light Switch
P
PK
P
Fuse 13
Drivers Lamp
Passenger Lamp
PK
Roof Light and Switch
To Terminal Post
PWS
Rear
Passenger
Delay
lamp
unit
Puddle Lamp LH Door
Switch
PW
Rear
Passenger
lamp
Blocking
Puddle Lamp RH Door
Diode
Switch
PW
WY
NOTE: This diagram is full of factory drawing errors
B
(awaiting correction by S&K Jagtech)
BY
Brake
Warning
Lamp
Warning Lamp
BY
Failure Unit
Reservoir brake switch
Oxygen Warning
PDWA
Lamp
BS
Handbrake
BW
Warning
Lamp
RH Stop Lamp
W
BW
Handbrake
Switch
BY
LH Stop Lamp
Stop Lamp failure Warning Unit
GP
To Foot Brake Switch
B B
LGP
To Ignition Switch
To Bulb Failure unit via diode
BS
To Stop Lamp bulb failure unit
WY
8
Jaguar XJ-S Door Lock/Unlock Lucas and Kiekerk Schematic
NR P
N N
OW
B
B
OR
FOR BOOT LOCK MOD
see Upgrades Schematics
B
B
OU
OG
Actuators (LUCAS SYSTEM)
LOCK UNLOCK
OR OG
L/H L/H
B
R/H R/H
Grounded through Solinoid body
To terminal 12v supply To terminal 12v supply
O/B
N N
O/R
B
O/R
O/B
P
Thermal breaker
W
Control Module
L/H Door Motor
O/W O/G
R/H Door Motor
O/W O/G
Boot / Trunk Motor
O/W O/G
9
Jaguar XJ-S Small item Schematic
Vacuum Delay Overcharge
Coolant warning Schematic
Schematic Schematic
G Fuse 4
W
Delay Unit
WU
To Ignition switch
WU
Warning
Light
B
Control
B
Low Coolant
Warning Light
Unit
Warning Lamp
Control
WR
WR
Unit
Coolant Temp
Sensor
PW
2 3 BS
4
B
B
NS
5
To Positive
B
Supply
To Ignition
Switch
B
2 3 way solenoid valve
3 2 way solenoid valve
4 Solenoid air valve
5 Coolant temp Switch
Seat Belt Warning Schematic
Aircon Cooling Fan Schematic
B B B
Logic Unit
GN
Coolant Fan
Diode pack
In Line Fuse
BG
BG
NR To fuse 2
PG To Door Switch
W To ignition sw
LG
K
GO
GN
Horn Sw
N
Horn Relay
LG
To Fuse 11 PY
LG
GN
PY
Horn Schematic
Horn Horn
To Fuse 1
To Fuse 11
To Aircon
B
10
AC Clutch
switch
Thermo
Jaguar XJ-S Trip Computer Schematic and Intruments
Trip Computer
10:30
Connector Connector
B
O
P
YG
Terminal Post
Interface
RU
Unit B
To Sidelamps
G G
To fuse 4
YG
To ECU pin 26
G
YB - Y
Y
Transducer
To Speedometer
G
To fuse 4
Temperature Oil pressure Fuel Battery
B
Tachometer
GU WN LGO WS
Low fuel warning
Coolant Oil
Fuel
WS w
temperature pressure
To ignition switch
tank
sender transmitter
sender
To Amplifier
11
Jaguar XJ-S Electrically operated door mirrors and heated backlight
PUS
PKS
RH Vertical Motor RH Horizontal Motor
RH mirror switch
PNS
To Fuse 8
PGS
PUS
PKS
LH Vertical Motor LH Horizontal Motor
LH mirror switch
PNS
To Fuse 8
PGS
Control Switch
To Ignition switch
Fuse 12
protection Relay
Delay Unit
LH Door Mirror Backlight RH Door Mirror
Warning Lamp
12
Jaguar XJ-S Heated Drivers Seat and Lumbar control & Quad headlamps
Heater Element
Heater Timer
Left Hand
To Ignition Switch
Lumber Motor
Seat relay (5 pin)
Fuse 19
Fuse 13
Fuse 20
Lumber Motor
Fuse 14
To Battery +12v Terminal post
Heater Timer
Right Hand
Heater Element
Main
Switch
Latched
U
Dip
U/R
Main
Fuse 3 20a
Main relay
R/H
Fuse 2 35a
U/W
Dip Beam
Headlamp
flash
Fuse 4 35a
L/H
Fuse 5 20a
13
Jaguar XJ-S Boot Lock/Unlock and JaguarSport TWR Ariel Arrest
Thermail breaker
+12v Terminal Post
NR N
N
OW
B
P
B
OR
B
B
OU
Grounded through solinoid body
OG
Actuators (LUCAS SYSTEM)
LOCK UNLOCK
OR OG
L/H L/H
B
R/H R/H
Boot lock Motor Upgrade
Aditional wiring shown
30/51 30/51 within dotted line
+12v from
terminal post
86 86
The motorized actuator is
held at ground on both
87 87a 87a 87
sides while the relays lay at
85 85
rest. Once energised by ether
the lock or unlock triggers
(O/R or O/G) that
corresponding relay switches
one side to Positive and the
motor moves to lock or
unlock depending on the
systems request.
WK In Line Fuse
Radio - CD/Tape
WK
Hirschmann Style
Clock where fitted
OW
3 Aerial
5
P
1
4
2
Delay relay unit
NP
Aerial Arrester Relay
87a
30/51
87
NP
86
85
BS
Boot Lights
Unlike the JaguarSport Arrester relay this one is wired after the delay relay so that
once the boot is opened far enough to activate the boot lights the aerial immediately starts
to descend even if the timer is still counting down. This way you preserve the delay stopping
the mast popping up and down as you move the key from Acc to Ignition.
14
Jaguar XJ-S Window Lift with 4 relay upgrade and Negitive rest
LH Window motor LH Window motor
R/G
G/R
R/U G/U
30/51 30/51 30/51 30/51
86 86 86 86
87 87a 87 87a 87 87a 87 87a
85 85 85 85
N
R/G
R/U
GR
1 2 1 2
G/U
3 3
6 6
7 8 7 8
LH Window lift switch RH Window motor
B B
NU
Thermal Switch
N
To Terminal post
Window Lift relay
WK B
To Ignition
In line 2amp fuse
NU
NU
N
To Terminal post
Switch motion and yes for some bizare reason
Alternative relay operation circuit
known only to the engineers at Lucas the motor
This schematic involves swapping the Positive and Negative
is live on both sides at rest.
terminals on the back of the switch.
This results in the relays and motors lying at negative when no
Up Rest Down
action is requested from the switch and should be given reasonable
Pins 1&3 - Pins 1&3 + Pins 1&3 +
Pins 2&6 + Pins 2&6 + Pins 2&6 - consideration as the correct method.
Please insure that a copy of this circuit is inserted into your cars
1 2 1 2 1 2
literature and that you attach a label to the switch harness so that
3 3 3
the next owner or garage know that this car is non standard.
As to why Jaguar decided to wire this for constant positive! Its any
ones guess, one short and its game over.
6 6 6
7 8 7 8 7 8
15
Jaguar XJ-S Wiper under relay control
A Intermittent/
flick wipe 7-3-1 & 5-6
B Fast Wipe 1-4 & 27
C Slow Wipe 1-5 & 2-7
D Off 1-7 and 5-6
30/51 30/51
86 86
A
87 87a
87
85 85
Term
B
Post
In line 35Afuse
30/51
C
86
87 87a
85
D
2 7 3 1 4 5 6
BLG
WLG
RLG
ULG
OLG
Wiper Motor
30/51
86
Run
Park
87 87a
85
Fuse 9
LG
This circuit was designed by Kirby Palm and is an adaptation from the one in his on-line book (see our links page).
Kirby rightly points out that this system provides a Solid Positive and Negative feed and is by far the best solution
which is why we substituted our original relay schematic for his superior one.
This is however not a direct copy, as we have re-configured the relays as an all in solution whereas his can be installed
as 1, 2 or 3 relays but we felt it is far better to go all the way. This is not a cure for wiper switch problems please see
the article in the support section of our web site at http://skjagtech.co.uk/html/support.htm for details.
16
Delay Unit