Discovery electrical Manual — part 75
THEFT ALARM SYSTEM (EXCEPT NAS)
T1
CIRCUIT OPERATION
6
BUILT IN TEST PROCEDURE
The handset should be detached from the key ring to
allow perimetric testing. The system will
automatically switch to volumetric testing if the
handset is in close proximity to the Ignition Switch
(X134).
The built in test procedure is accessed as follows:
1. Starting conditions: ignition off, doors unlocked,
alarm disarmed, bonnet switch depressed.
2. Carry out instructions 3 to 7 within 5 seconds.
3. Release bonnet switch.
4. Switch ignition on.
5. Open driver’s door.
6. Switch ignition off.
7. Switch ignition on.
If alarm is correctly accessed, the alarm sounder will
sound briefly and the Theft Alarm LED and hazard
lamps will flash. The following checks can then be
made:
Perimetric Testing
1. Open and close driver’s door or tailgate – Theft
Alarm LED and Hazard lamps will flash.
2. Depress and release bonnet switch – Theft
Alarm LED and Hazard lamps will flash.
3. Pull the driver’s door sill button up – Theft alarm
LED and Hazard lamps will flash.
4. Turn driver’s door key lock cylinder – Theft Alarm
LED and Hazard lamps will flash.
Volumetric Testing
1. Press the unlock button on the handset or move
the handset close to the Ignition Switch (X134) to
disable perimetric testing and enable volumetric
testing.
2. Any movement within the vehicle will be detected
by the Alarm Sensor (X213) and indicated by
flashing the Theft Alarm LED and hazard lamps.
3. Turn off ignition to end test procedure.
HANDSET INITIALISATION
The Theft Alarm Unit (Z163) must be programmed
whenever handsets are replaced. The serial
communications line is used to activate the “learn
mode” of the Theft Alarm Unit (Z163). Then the
handset(s) to be initialised must be made to transmit
their coded data to the Theft Alarm Unit (Z163).
NOTE: All handset(s) must be programmed during
the same learn mode period. It is not possible to
simply add a handset to the Theft Alarm Unit (Z163)
which has been programmed to other handsets.
When the “learn mode” of the Theft Alarm Unit
(Z163) has been accessed, the handset(s) are
programmed using the following procedure:
1. Starting conditions: Theft Alarm disarmed and
vehicle mobilised.
2. Press the handset unlock button a minimum of 8
times.
3. If the handset has been correctly programmed,
the horn will sound briefly and the hazard lamps
will flash once.
4. The next handset, up to a maximum of 4, can
now be programmed using the same procedure.
NOTE: It is very important that each handset is
programmed separately. If the Theft Alarm Unit
(Z163) receives key presses from two handsets,
then neither handset will be programmed.
The “learn mode” is terminated using the serial
communications line. If the Theft Alarm Unit (Z163)
would not accept reprogramming, the original
handset(s) will still function.
THEFT ALARM SYSTEM (EXCEPT NAS)
T1
7
CIRCUIT DIAGRAM
MFI–V8
S204
30
F 1
15 A
E200
15
F 5
10 A
P127
Satellite Fuse
Box 1
Z163
Theft Alarm Unit
P
25
GK
10
C225
HJ3
17
BO
S2033
GK
30
F 4
30 A
P125
Engine Compart-
ment Fuse Box
PN
8
C274
S2089
11
C274
8
C2083
8
C217
S2107
S2017
B
1
C101
KB
X318
Data Link Con-
nector (OBDII)
See Ground Dis-
tribution
See Fuse Details
See Fuse Details
C225
HJ4
See Fuse Details
Z132
Engine Control
Module (ECM)
31
C243
LGP
Z276
Diesel Immobi-
lisation Unit
(DDS)
1
C1040
B
300Tdi with EDC
300Tdi with EGR
MFI–T16
300Tdi without
EGR
Not used
THEFT ALARM SYSTEM (EXCEPT NAS)
T1
8
CIRCUIT DIAGRAM
26
Z270
Passive Immobi-
lisation Coil
S332
Z163
Theft Alarm Unit
3
3
X213
Alarm Sensor
WB
20
20
1
BN
21
C225
C277
C335
2
C335
B
E401
12
PK
7
R
2
C2096
C274
SR
R
1
C2096
WB
C225
Antenna
See Ground Dis-
tribution
Shield
13
SCR
THEFT ALARM SYSTEM (EXCEPT NAS)
T1
9
CIRCUIT DIAGRAM
Z163
Theft Alarm Unit
7
YK
[1]
[2]
M114
Left Front Door
Lock Actuator
[1]
Lock
[2]
Unlock
See Ground Dis-
tribution
5
4
C507
B
3
C507
B
S501
E201
Not used
6
C2101
X212
Alarm Bonnet
Switch
[1]
Open
X201
Left Front Door
Key Switch
[1]
Key turned
[2]
Key out
See Ground Dis-
tribution
See Ground Dis-
tribution
8
9
3
1
C2101
C504
4
C504
S501
1
C178
2
C178
E200
B
B
PO
UG
B
S204
[2]
[1]
0
[1]
E201
YN
HJ3
C225
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