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Jaguar XJ-SSchematic Drawings
http://www.skjagtech.co.uk
1975 -1991Pre facelift models
Copyright (c) S&K Jagtech (skjagtech.co.uk) 2005
Document dated 15-May-2006
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
DISCLAIMERShould you decide to undertake work on any system covered in these documents, SK Jagtech accept noliability for damage to the vehicle or personal injuries however caused. The information in thisdocument is provided to help explain and provided reference material.We are geared up with the right equipment and have trained knowledgeable staff who can performmaintenance and fault finding on your Jaguar and it is recommend that you leave any technical workto a suitable specialist firms if you are in any way unsure of a procedure. You are always welcometo contact us for advice.
Contents
MainSwitch
Headlamp inhibit relay
Main relayHeadlampflash
Fog lamp switch
Fuse 1
Fuse 5
Fuse 3
Fuse 4
Fuse 2
Dip Beam
R/H
L/H
R/H
L/H
Main Beam
Front Fog lamps
Rear Fog Lamps
R/H
L/H
R/H
L/H
R/U
R/Y
R/O
N
R/U
U/R
U
U/W
Main beamwarning
lamp
Fog lampwarning
lamp
Terminal postN
U
To Stop lampfailure unit
To Caravan Socket
To Caravan Socket
R/H
L/H
No plate
Rear tail
No plate
Rear tail
F parking L/H
F parking R/H
Switch andClock Lamps
Panel Lamps
Fibre Optic Lamp Cigar lighter
Gearbox selector
Bulb Failure lamp
Warning lamp blocking diodes
Rheostat Fuse 7
Bulb failureunit front
Bulb failureunit left rear
Bulb failureunit right rear
Rear lamp in-line fuse
Rear lamp in-line fuse
Fuse 15
Fuse 14
Side markerNAS
Side markerNAS
Alternative tocomputer harness
if fitted
LatchedDip
Main
Generic DiagramDifferent models are cableddifferently and therefore thisdiagram is a generic curcuitthat should help trace a fault.
As data becomes availablewe will add additional diagramsto cover the differences inswitch gear extra
Jaguar XJ-S Head, Side and Fog light Schematic
3
Y
BR
YW
YB
NW
N
G
N
NB
NY BK
YP
B
BS
YB
YW
GP
YO
YOBG
LGY G
BW B
BLGW G
YW
Wiper Motor Right
Wiper Motor Left
Transducer
Speed ControlInterface ECU
Bellows and actuator solenoid valves
Wash Wipe Relay
LG
U
LG
BW To headlightmain beam
UR To headlightDip beam
Diode PackPektron Blue
WindscreenWasher Pump
Headlightwasherpump
LGUWasher switch
Brake Operated switch
Control Switch
Fuse 17
Set Switch
Inhibit Switch
Kickdown Solenoid
Kickdown Switch To fuse 5
To fuse 4via controlmodule inBoot/trunkharness
1
2
3
45
Jaguar XJ-S Headlamp wash wipe and Cruise Control Schematic
4
A
B
C
D12 3 4 5 67
Wiper Motor
Park Run
LG
OLG
ULG
RLG
WLG
BLG
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
Switch Schematic explainedThis is a Jaguar idea here (don’t blame us)The black lines A, B, C and D are used toshow which contacts 1-7 are conected inwhich ever mode is in use.For exampleSlow=1-5 and 2-7 Fast=1-4 and 2-7Below are two other variations 1 designed by uswhich are provided to get the point across
Off/Park
Slow
Fast
Intermitant
W/LG
B/LG
K/LG
LG/BB
U/LG
R/LG
LG
W/LG
B/LG
K/LG
LG/BB
U/LG
R/LG
LG
W/LG
B/LG
K/LG
LG/BB
U/LG
R/LG
LG
W/LG
B/LG
K/LG
LG/BB
U/LG
R/LG
LG
Off/Park
Slow
Fast
Intermitant
Fuse 9
Del
ay U
nit
Jaguar XJ-S wash wipe and heated backlight Schematic
5
Jaguar XJ-S Radio, Merlin and Hirschmann Aerial Schematic
Radio - CD/Tape
Aerial
Delay relay unit
Boot Lights BS
NP
Clock where fitted
In Line FuseWK
WKUW
UR
3
5
1
2
4
Merlin Style Electric Aerial
Radio - CD/Tape
Aerial
Delay relay unit
Boot Lights BS
NP
Clock where fitted
In Line FuseWK
WKW/O
P
3 5
1
2 4
Hirschmann Style Electric Aeriel
30/5
1
87
86
85
87a
Omiting Mast DelayFor those who don’t want the 10 sec delay for themast to retract or who have a faulty delay module:Substitute with a change over relay (Part no REL7DBavailable from us) and wire it in as per the relayschematic shown in fig 1. Note that the pin configurationis different on a standard ISO relay than on the Lucasdelay module, fig 2.
Fig 2 Lucas withISO numbering
30/5
1
87
86
87a
Fig 1
30/5
1
87
86
85
87a
Omiting Mast DelayFor those who don’t want the 10 sec delay for themast to retract or who have a faulty delay module:Substitute with a change over relay (Part no REL7DBavailable from us) and wire it in as per the relayschematic shown in fig 1. Note that the pin configurationis different on a standard ISO relay than on the Lucasdelay module, fig 2.
Fig 2 Lucas withISO numbering
30/5
1
87
86
87a
Fig 1No connection
85
85
6
Jaguar XJ-S Flasher indicators and window lift Schematic
Hazard Switch
Flasher Unit
Flasher Switch
Blocking diode
LH Warning LampBlocking diode
RH Warning lamp
RH repeater
RH Front indicator
RH Rear indicator
LH repeater
LH Front indicator
LH Rear indicator
Hazard warning lamp
Fuse 2To terminal post
To fuse 5
Acoustic unit
Caravan Socket Caravan Socket
B
B
GW
GN
LGB
LGU LGP
NO
LGU
G
LGN
LH Window lift switch
LH Window motor
RH Window lift switch
RH Window motor
RG GR RU GU
B
B
B
NU
NU NU N
WK
To Terminal post
To Ignition
Window Lift relay
Thermal Switch
UN
KN
OW
N
1 23
67 8
1 23
67 8
Up Rest Down
1 23
67 8
1 23
67 8
1 23
67 8
Pins 1&3 -Pins 2&6 +
Pins 1&3 +Pins 2&6 +
Pins 1&3 +Pins 2&6 -
Switch motion and yes for some bizare reasonknown only to the engineers at Lucas the motoris live on both sides at rest.
7
Jaguar XJ-S Interior Lights and Bulb failure Schematic
Map Light Switch Interior Light Switch
Roof Light and Switch
Fuse 13
To Terminal Post
Delayunit
LH DoorSwitch
RH DoorSwitch
BlockingDiode
Puddle Lamp
RearPassenger
lamp
Puddle Lamp
RearPassenger
lamp
Drivers LampPassenger Lamp
PG
PWS
P
PK
PW
PW
P
PK
PWS
Warning LampFailure Unit
Reservoir brake switch
PDWA
BrakeWarning
Lamp
Oxygen WarningLamp
HandbrakeWarning
Lamp
HandbrakeSwitch
Stop Lamp failure Warning Unit
RH Stop Lamp
To Ignition Switch
LH Stop Lamp
To Bulb Failure unit via diode
To Foot Brake Switch
To Stop Lamp bulb failure unitBS
WY
BWY
B
GP
LGP
BY
B
W
BW
BW
BY
BY
BS
NOTE: This diagram is full of factory drawing errors(awaiting correction by S&K Jagtech)
8
Jaguar XJ-S Door Lock/Unlock Lucas and Kiekerk Schematic
LOCK UNLOCK
L/H
R/H
FOR BOOT LOCK MODsee Upgrades Schematics
L/H
R/H
Actuators (LUCAS SYSTEM)
OR OG
OG
OR
OW
NR N PN
B
B
B
B
B
OU
O/B
O/R
O/W O/G
B
N
P
N O/R
O/B
O/W O/G
O/W O/G
Control Module
To terminal 12v supply To terminal 12v supply
Thermal breaker
L/H Door Motor
R/H Door Motor
Boot / Trunk Motor
W
Grounded through Solinoid body
9
Jaguar XJ-S Small item Schematic
Fuse 4
WarningLight
ControlUnit Low Coolant
Warning Lamp
Coolant TempSensor
To Ignition switch
G
WU
B
WR
B
WU
W
WR
Coolant warning Schematic Vacuum Delay Schematic
Overcharge Schematic
To Aircon To Fuse 11 To Fuse 1
Delay Unit
2 34
5
2 3 way solenoid valve3 2 way solenoid valve4 Solenoid air valve5 Coolant temp Switch
To PositiveSupply
Warning LightControl
Unit
To IgnitionSwitch
PW
NS
BS
B B
B
B
B BLogic Unit
Seat Belt Warning SchematicB
To fuse 2NR
PG To Door SwitchW To ignition sw
GO K
Horn Sw
To Fuse 11
Horn Relay
Horn Horn
LG
PY
B
N
PY
Coolant FanIn Line FuseDiode pack
GN
GN
LG
BG
BG
LG
GN
Aircon Cooling Fan Schematic
Horn Schematic
AC
Clutch
Therm
osw
itch
10
Transducer
10:30
Terminal Post
To Sidelamps
To fuse 4
To ECU pin 26
To Speedometer
Connector
Trip Computer
YG
O
B
G
YB - Y Y
B
P
RU
G
YG
G
Jaguar XJ-S Trip Computer Schematic and Intruments
InterfaceUnit
Connector
G
B
GU WN LGO WS
To fuse 4
Temperature Oil pressure Fuel Battery
Tachometer
To Amplifier
To ignition switch
Low fuel warningFueltank
sender
Oilpressure
transmitter
Coolanttemperature
senderwWS
11
Jaguar XJ-S Electrically operated door mirrors and heated backlight
PNS
PKS
PUS
PGS
PNS
PKS
PUS
PGS
To Fuse 8
To Fuse 8
RH mirror switch RH Vertical Motor RH Horizontal Motor
LH mirror switch LH Vertical Motor LH Horizontal Motor
�
LH Door Mirror Backlight RH Door Mirror
Warning Lamp
Control Switch
Delay UnitFuse 12
To Ignition switchprotection Relay
12
Jaguar XJ-S Heated Drivers Seat and Lumbar control & Quad headlamps
Fuse 14
Fuse 13
Fuse 20
Fuse 19
To Ignition Switch
To Battery +12v Terminal post
Seat relay (5 pin)
Heater Timer
Heater Timer
Lumber Motor
Lumber Motor
Heater Element
Heater Element
Left Hand
Right Hand
Main relay
Headlampflash
Fuse 5 20a
Fuse 3 20a
Fuse 4 35a
Fuse 2 35aDip Beam
R/H
L/H
U
U/W
LatchedDip
Main
MainSwitch
U/R
13
LOCK UNLOCK
L/H
R/H
L/H
R/H
Actuators (LUCAS SYSTEM)
OR OG
OG
OR
OW
NR
NP
N
B
B
B
B
B
OU
+12v fromterminal post
Boot lock Motor Upgrade
Aditional wiring shownwithin dotted line
The motorized actuator isheld at ground on bothsides while the relays lay atrest. Once energised by etherthe lock or unlock triggers(O/R or O/G) thatcorresponding relay switchesone side to Positive and themotor moves to lock orunlock depending on thesystems request.
Radio - CD/Tape
Aerial
Delay relay unit
Boot Lights BS
NP
Clock where fitted
In Line FuseWK
WK
OW
P
3 5
1
2 4
Jaguar XJ-S Boot Lock/Unlock and JaguarSport TWR Ariel Arrest
Hirschmann Style
85
86
8787a
30/51
85
86
87 87a
30/51
85 86
87
87a30/51
NP
Aerial Arrester Relay
Unlike the JaguarSport Arrester relay this one is wired after the delay relay so thatonce the boot is opened far enough to activate the boot lights the aerial immediately startsto descend even if the timer is still counting down. This way you preserve the delay stoppingthe mast popping up and down as you move the key from Acc to Ignition.
Grounded through solinoid body
Thermail breaker +12v Terminal Post
14
LH Window lift switch
LH Window motor
RH Window motor
R/G
GR
B
B
NU
NU NU N
WK
To Terminal post
To Ignition
Window Lift relay
Thermal Switch
85
86
87 87a
30/51
85
86
87 87a
30/51
1 23
67 8
LH Window motor
B
85
86
87 87a
30/51
1 23
67 8
N To Terminal post
In line 2amp fuse
G/R
R/GR/U
G/U
G/U
N
R/U
85
86
87 87a
30/51
Up Rest DownPins 1&3 -Pins 2&6 +
Pins 1&3 +Pins 2&6 +
Pins 1&3 +Pins 2&6 -
Switch motion and yes for some bizare reasonknown only to the engineers at Lucas the motoris live on both sides at rest.
1 23
67 8
1 23
67 8
1 23
67 8
Alternative relay operation circuitThis schematic involves swapping the Positive and Negativeterminals on the back of the switch.This results in the relays and motors lying at negative when noaction is requested from the switch and should be given reasonableconsideration as the correct method.Please insure that a copy of this circuit is inserted into your carsliterature and that you attach a label to the switch harness so thatthe next owner or garage know that this car is non standard.As to why Jaguar decided to wire this for constant positive! Its anyones guess, one short and its game over.
Jaguar XJ-S Window Lift with 4 relay upgrade and Negitive rest
15
A
B
C
D12 3 4 5 67
Park
Del
ay U
nit
LG
OLG
ULG
RLG
WLG
BLG
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
85
86
87 87a
30/51
In line 35Afuse
Fuse 9
85
86
87 87a
30/51
85
86
87
30/51
85
86
87 87a
30/51
Wiper Motor
Run
TermPost
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 solutionwhich 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 installedas 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 seethe article in the support section of our web site at http://skjagtech.co.uk/html/support.htm for details.
Jaguar XJ-S Wiper under relay control
16