ECU JAGUAR XJ6 1994 2.G Workshop Manual

Security System - RESTRICTED lSSUE
Fault:
Possible causes:
Remedy: Fault:
Fault:
Possible causes:
Remedy:
Fault:
Possible causes:
Remedy: Intrusion
sensing inoperative
1. Faulty sensor.
2. Harness wiring or connectors faulty.
1. Renew sensor.
2. Examine and repair or renew faulty harness.
Inclination sensing inoperative
1. Faulty sensor.
2. Harness wiring or connectors faulty.
1. Renew sensor.
2. Examine and repair or renew faulty harness.
1.
2.
3.
4.
1.
2.
3.
4.
Fuel filler cap locking / unlocking faulty
No power to actuator relay.
Wiring harness or connectors faulty
Relay faulty
Actuator faulty.
Check fuse
F1 in RH 'A' post fuse box.
Examine and repair or renew faulty harness.
Renew relay.
Renew actuator.
Pan.; feature inoperative
1. Transmitter battery inoperative.
2. Rear screen aerial cable damaged / disconnected.
1. Renew battery.
2. Identify and repair aerial fault.
Fault: Central locking switch inoperative
Possible causes:
1. Harness wiring or connectors faulty.
2. Switch faulty.
Remedy: 1.
2. Renew switch.
Examine
and repair
or renew damaged harness.
X3OO VSM Issue 1 August 1994 22

Security System - RESTRICTED ISSUE 84
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Description
Security / Locking Control Module
Central locking switch
Front passenger door ajar switch
RH rear passenger door ajar switch
LH rear passenger door ajar switch
Driver's door ajar switch
Driver's door lock switch
Passenger's door lock switch
Driver's door unlock relay (NAS only)
Non
-deadlock shorting links (NAS only)
Front left
/ rear right deadlock relay
Front right
/ rear left deadlock relay
Door lock relay
Door unlock relay
LH Rear door actuator and switch
RH Rear door actuator and switch
Front door actuator lock
/ deadlock status
switches
Driver's door actuator lock
/ deadlock status
switches
Driver's door unlock shorting link
RH 'A' post base fuse-box
A5.9 PIN-POINT TESTS
The following information details test procedures to identify specific component faults.
The table below provides a key to items identified on the following schematic diagrams.
Item Description No.
21 Hood switch
22 LH Engine bay fuse-box
23 Horn relay
24 Horn unit LH
25 Horn unit
RH
26 Horn switches
27
Inclination sensor
28 Intrusion sensor LH
29 Intrusion sensor
RH
30
31
32 Reader exciter module
33 Reader exciter coil
34 Trunk fuse
-box
35 Security active indicator
36 Security sounder
37 Trunk release relay
38 Trunk release actuator
39 Trunk release switch (fascia)
40 Trunk release switch
41 Valet switch
Passenger
door key barrel switch
Driver's door key barrel switch
Item No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
X300 VSM 24 Issue 1 August 1994

Security System - RESTRICTED ISSUE
A5.9.2
1.
2.
3.
4.
Door ajar switches
Close all four doors and turn ignition to ON.
Open each door in turn, checking that instrument pack indicator lamp illuminates at every
opening action.
On identification of non
-illumination check continuity across suspect door switch, door closed -
switch open circuit, door open switch short circuit.
If switches test correctly check wiring continuity between SLCM connector and switches, then to
ground as detailed below
Door SLCM Switch Ground
Driver's Pin 07,12-way Pin 06 Pin 07
Passenger's Pin 01, 16-way Pin
06 Pin 06
(front)
Passenger's (rear) Pin
21,22-way Pin 05 Pin 06
PolC
1 Po7C
J86 - 1907
Fig. 1 Door Ajar Switches Circuit
X300 VSM Issue 1 August 1994 26

0
1
AS. 9.3 Door locks
U 1. Check harness wiring continuity between multi-plug 12-way connector pins 10 (driver's side)
and
4 (passenger's side) to respective door lock connector pin 8. Ensure secure ground
connection from each lock connector pin
9.
Test continuity across switch pins, reading should be open circuit with door unlocked, short
circuit with door locked. 2.
7 e-----
I I I
1 r
I-, -a
.-
mT
YB .
mcE?-l
YR
7 7 p-ww--
I I I
) ,
1
JBB-1908
I Fig. 1 Door Locks Circuit
9 J
3
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Security System - RESTRICTED ISSUE 84
4b
A5.9.4 Door lock actuators and switch
1.
2.
3.
Examine fuse F1 in right hand 'A' post base fusebox, if blown determine reason for rupture and
renew.
Check continuity of harness wiring as shown on Fig.
1 below. Ensure secure ground connection
from lock/ unlock and deadlock (not N.A.S.) relay pins
4 and 9.
Remove the left hand rear seat hell board, gaining access to lock/ unlock and deadlock (not
N.A.S.) relays. Operate lock/ unlock and deadlock checking for audible relay operation. renew
suspect relays.
Release door lock and measure resistance between actuator unit pins
2 and 3, a value of
approximately
8Q should be recorded. Operate door lock and check that circuit between pins 2
and 3 is opened. Resistance across pins 1 and 3 should now be approximately 88.
4.
SI
+
SR SI I I sa VI II
I 1
J8S-1909
Fig. 1 Door Lock Actuator Circuit
*I N.A.S. only
*2 Not N.A.S.
X300 VSM Issue 1 August 1994 28

Security System - RESTRICTED ISSUE
AS. 9.6 Horns
1.
2.
Check fuses FIO and F14 in LH engine bay fuse box; if blown determine reason for rupture and
renew.
Check wiring harness continuity from multi
-plug 26-way connector pin 24 to relay unit
connector pin
6 and column switchgear connector pin 16. Ensure secure ground connection
from column switchgear connector pin
7.
Check wiring harness continuity from fuse connector pins 7 and 8 to LH and RH horn
respectively. Ensure secure ground connection from both horn units.
Ensure that
+12V (nominal) is present at the relay connector pin.
Operate horn switches and check that
+12V (nominal) is present at the two fuse connector pins
and
at speaker connector pin 44 (both units).
Check resistance across speaker unit pins;
a value of approximately 2Q should be recorded.
P21.
1
r- I
$ I
I
I
I I I,, Fu
0
J86- 1911
Fig. 1 Horn Unit and Relay Circuit
X300 VSM Issue 1 August 1994 30

Security System - RESTRICTED ISSUE 84
-
A5.9.8 Intrusion sensors
1. Check harness wiring continuity as shown below:
SLCM connector Sensor connector Function
Lsft-hand side sensor
pin 10 pin 2 ground
pin
11 pin 4 40kHz
pin 12 pin 5 I/P
pin 13 pin 3 +av
RightAand side sensor
pin 2 pin 2 ground
pin
3 pin 4 40kHz
pin 4 pin 1 I/P
pin 5 pin 3 +av
2. Lock and arm the vehicle while sat inside; wait 15 seconds, then attempt to cover either sensor rea
with the palm
of the hand. Check that sensor detects movement and activates alarm. Repeat test
for second sensor.
+8v P13B
40KHz P11 B
IPP128
rPloB
1
Fig. 1 Intrusion Sensor Circuit J86- 1013
Issue 1 August 1994 32 X300 VSM

Security System - RESTRICTED /SUE 84
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A5.9.10 Reader exciter coil and module
1.
2.
3.
Check fuse F4 in trunk fuse box, if blown determine reason for rupture and renew.
Check harness wiring continuity as follows:
SLCM connector Module connector Coil connector Function
ground
data code
pin 6 (16-way)
pin 19 -
pin 9 (12-way) pin 06 -
pin 11 (22-way) pin 08 - immobilization on
pin 1 pin
10 coil terminal 2
pin 9 pin 11 coil
terminal 1
pin
10 - +12v
-
-
-
ground - pin 20 -
Measure continuity between coil pins.
1
JW- 1918
Fig. 1 Reader Exciter Coil and Module Circuit
Issue 1 August 1994 34 X300 VSM

AS. 9.11 Security active indicator
0
1. Check wiring continuity from multi-plug 26-way connector pin 19 to central locking switch
connector pin 13. Ensure secure ground at switch connector pin 16.
If indicator is faulty the whole clock module must be renewed, refer to
sub-section 15.9.10. U&Q:
0
e
0
P191
1
J86.1916
Fig. 1 Security Active Indicator Circuit

Pt
P2Ob
A5.9.12 Sounder
Check harness wiring continuity from multi-plug 26-way connector pins 13 and 26 to sounder
connector pins
2 and 1 respectively.
Measure resistance across sounder pins; a value
of 8Q should be recorded.
X300 VSM Issue 1 August 1994 36 ~ ~~~
1
J86 - 1917
Fig. 1 Security Sounder Circuit
X300
VSM