Land Rover Discovery Lhd Models Etm 1995 4th Edition Exp Rover Manual

							THEFT ALARM SYSTEM 
1
ETM T1
DISCOVERY
ELECTRICAL TROUBLESHOOTING MANUAL
CIRCUIT OPERATION
For 1995 models a vehicle alarm system is
available as original equipment. The main function
of the system is to offer easy±to±use remote
locking and unlocking of the vehicle without having
to actively select the alarm function.
ALARM COMPONENTS
4. Theft Alarm Unit (Z163) and Theft Alarm Relay
(K159)
5. Alarm Bonnet Switch (X212)
6. Tailgate Switch (X170)
7. Horns (K128, K134) and Horn Relay (K189)
8. Theft Alarm LED (B151)
9. Alarm Sensor (X213) (Not on all vehicles!)
10. Front Door Key Switches (X201, X202)
11. Lock Actuators (M114, M122, M117, M125,
M132)
12. Handset Transmitter (two supplied)
ANTI±THEFT SYSTEM FUNCTION
Perimetric Protection
Using the key in the correct sequence will turn on
and off perimetric protection only. When fully
perimetrically armed, all doors, tailgate, and bonnet
are protected against unauthorized access. If the
door key is used in the normal manner the driver
will be unaware of the door key sequence. The
time taken to lock or unlock with the key must be
less than 5 seconds. To prevent unauthorized
tampering, the alarm will sound if the key is held in
the unlocked position for longer than 5 seconds
when armed. Cranking is disabled when perimetric
protection is armed.
NOTE: When key is turned left or right, the key
switch input will be activated in conjunction
with the sill button switch when links are
operated.
Volumetric Protection
Using the handset transmitter will turn On and Off
volumetric protection. In volumetric mode the
vehicle interior is protected using the Alarm Sensor
(X213). Using the handset also arms and disarms
the vehicle perimetrically. Cranking is disabledwhen volumetric and perimetric protection is
armed.
NOTE: If armed volumetrically, the vehicle
CANNOT be disarmed using the key.
Alarm Sounder (Z171)
When an intrusion is detected the Alarm Sounder
(Z171) will sound intermittently (Switzerland and
Denmark continuous horn sound) and the hazard
lights flash (where territorial regulations allow) for
30 seconds. The alarm must be retriggered before
the Alarm Sounder (Z171) will sound again. 
						

							THEFT ALARM SYSTEM
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ELECTRICAL TROUBLESHOOTING MANUA L
Vehicle Status Indication
Vehicle status is indicated by up to three devices:
(a) Alarm Sounder (Z171), (b) hazard lights, (c)
Theft Alarm LED (B151). When the vehicle arms in
either mode, the hazard lights will flash three times
and the LED will flash rapidly for 10 seconds. LED
will then flash at a slower rate while vehicle is
armed. When the vehicle disarms, hazard lights will
flash once and LED will extinguish. If LED remains
lit, it indicates that the alarm has been triggered.
Turning on ignition or arming the alarm will
extinguish LED. The LED will give a long pulse
flash to indicate the Alarm Sensor (X213) being
activated.
Central Locking
Central Locking is controlled by the Theft Alarm
Unit (Z163) and may be operated by the key, sill
button(s) or handset. The system works on both
front doors on four door vehicles or drivers door on
two door vehicles.
NOTE: The central door locking system will shut
down for a period after more than 15
consecutive operations.
Inertia Switch
An inertia switch is incorporated in the Theft Alarm
Unit (Z163). If ignition is on and the vehicle
receives an impact sufficient to activate the inertia
switch, the unit will signal to unlock central locking
actuators and flash hazard lights. Central locking
will remain disabled for 30 seconds. To reset, turn
ignition off and then on after the 30 second period
has elapsed.
Alarm Sensor (X213)
The sensor operates by emitting an air pressure
carrier wave and receiving the wave back. Any
disturbance within the vehicle which disturbs the
wave will be detected, triggering the alarm. When
the volumetric sensor is activated it monitors
movement within the vehicle for 15 seconds before
detecting and responding to intrusions. If the
sensor detects movement within the vehicle it
delays arming until a 15 second quiet period has
elapsed. If continuous movement is detected, the
alarm will not arm volumetrically.
Radio Frequency System
The RF system uses four frequencies according to
market. If the coaxial aerial is not fitted, system
performance will be impaired. Both ECU and
handset have a colour±coded label.
Frequency Colour Territory ECU/Handset:
418.0 MHz, Pink/pink: UK, Ireland
224.5 MHz, Yellow/yellow: France
433.92 MHz, Blue/blue: Europe (not France,
 Switzerland, Italy, Denmark)
433.92 MHz, White/blue: Switzerland, Denmark
315.0 MHz, Green/green: Rest of World, Italy,
 Australia
315.0 MHz, Orange/green: Gulf, Japan 
						

							THEFT ALARM SYSTEM 
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ELECTRICAL TROUBLESHOOTING MANUAL
Partially armed mode
If a door, tailgate or bonnet is left open when the
system is armed, the LED will not light for 10
seconds indicating a mislock condition. Hazard
lights will not flash. If an open door or tailgate is
causing the mislock, the starter motor is disabled.
The alarm will sound if ignition is turned to start
position. If an open bonnet is causing the mislock,
the starter motor is disabled. The alarm will arm the
volumetric part of the system. If the door, tailgate
or bonnet is subsequently closed, after a 5 second
delay, the doors will unlock and immediately lock,
and the system will fully arm.
Handset Transmitter
The handset LED will give one flash when button is
pressed momentarily. If button is held down the
LED will light again after 2 seconds for 2 seconds,
and extinguish until button is released and
repressed. The handset contains unique
information distinguishing it from other transmitters.
It also contains a set of `random rolling codes
programmed into the ECU before leaving the
factory. Each time the handset is pressed a
different code is transmitted to the ECU.
If the handset is operated more than four times
outside the vehicle range (6 metres) or power
supply is removed, it will be necessary to
re±synchronise handset and the ECU by pressing
the handset three times within range and within 5
seconds.
NOTE: If both handsets are lost or damaged when
system is armed, it will be necessary to fit a
new ECU with two matching handsets.
Handset Batteries
If handset LED flashes continuously when button is
pressed, the batteries need replacing. The hazard
lights will flash one 3 second pulse, instead of three
times upon arming vehicle.
Power Up Mode
The alarm system always remembers the state it
was left in when power was removed. If the alarm
powers up in an alarmed state and is subsequently
triggered, it will give a warning that it will fully
trigger unless disarmed. This warning consists ofshort horn pulses every two seconds for 15
seconds.
New Born Mode
When the ECU is first produced, it will be in its
`new born mode. In this mode it will respond to any
remote of the right frequency. This mode will be
cancelled when the ECU has received ten valid
handset signals without power interruption.
Engine Cranking
It is only possible to crank the engine when ignition
is ON and alarm is disabled. 
						

							THEFT ALARM SYSTEM
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ELECTRICAL TROUBLESHOOTING MANUA L
BUILT IN TEST PROCEDURE
The built in test procedure is accessed as follows:
1. Starting conditions: ignition off, doors unlocked,
bonnet switch depressed.
2. Carry out instructions 3 to 7 within 8 seconds.
3. Release bonnet switch.
4. Switch ignition ON.
5. Lock doors.
6. Switch ignition OFF.
7. Switch ignition ON.
If alarm is correctly accessed, horn will sound and
LED will flash. The following checks can be made:
8. Open and close any door or tailgate ± LED will
light.
9. Depress bonnett switch ± hazards will flash.
10. Check engine cranking is disabled. Do not turn
off ignition.
11. Check ultrasonic by operating handset, LED
will emit one 5 second flash, and will flash if
interior is disturbed.
NOTE: If ECU is in new born mode, any handset of
the right frequency will work. If not,
initialised handset is required. See Handset
Initialisation.
12. Turn OFF ignition or press handset to end test
procedure. Horn will sound as before to
indicate end of test mode. 
						

							ELECTRICAL TROUBLESHOOTING MANUAL
ETM T1
Theft Alarm System
5
DISCOVERY
S2032
30
F 1
15 A
E200
15
F 5
10 A
S2017P127
Satellite Fuse
Box 1
Z163
Theft Alarm Unit
1.0 P
See Fuse Details
See Ground Dis-
tribution Except NAS NAS
S2033
1.0 P
6 C2741.0 GK
HJ2
0.5 GK
10
2 C274
HJ30.5 BO
C225
J188
Antenna 
						

							ELECTRICAL TROUBLESHOOTING MANUA L
T1 ETM
Theft Alarm System
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DISCOVERY



  

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C274 45
1.0 O 1.0 K
1.0 O0.5 O
2 C306
0.5 O
S314
0.5 O1.0 O
8 C602
0.5 O1.0 O
8 C502
1 C507
2 C5079 C502 1.0 K
1.0 K
9 C602
0.5 K
2 C607
1 C6070.5 K
3 C306
0.5 K
S315
2 C701
2 C706
1 C706
1 C701
1 C801
1 C806
2 C806
2 C8010.5 K
1.0 K
S2007 S2072S2073 S2009
0.5
O0.5
K
0.5
O0.5
O0.5
K0.5
K
0.5
O0.5
K KO
KO 
						

							ELECTRICAL TROUBLESHOOTING MANUAL
ETM T1
Theft Alarm System
7
DISCOVERY
T1-6
M132
Tailgate Lock
Actuator
AB
2 1 C414 1.0 O 1.0 K6 4 C415 1.0 O 1.0 K5 6 C277 1.0 O 1.0 K
OK
M 
						

							ELECTRICAL TROUBLESHOOTING MANUA L
T1 ETM
Theft Alarm System
8
DISCOVERY
[1][2]
M114
Left Front Door
Lock Actuator
[1] Lock
[2] UnlockZ163
Theft Alarm Unit
See Ground Dis-
tributionC225 62
0.5 YK
0.5 GB
5 4 C507
0.3 B
3 C507
0.5 B
S501
E201
6 C502
Not used6 C602
Not used 
						

							ELECTRICAL TROUBLESHOOTING MANUAL
ETM T1
Theft Alarm System
9
DISCOVERY
Z163
Theft Alarm Unit
Z148
Multi±Function
Unit (MFU)
X212
Alarm Bonnet
Switch
[1] Open X201
Left Front Door
Key Switch
[1] Key turned
[2] Key out
See Ground Dis-
tributionSee Ground Dis-
tribution 371 12 C225
3 C602
S5014 C504 1 C1782 C1784 C205
0.5 UG
3 C502
1 C504
0.5 B
E201E200 0.5 BB 0.5 PO 0.5 PU 0.5 KB
S204 [2] [1]
0[1]
HJ3
Not used 
						

							ELECTRICAL TROUBLESHOOTING MANUA L
T1 ETM
Theft Alarm System
10
DISCOVERY
30
F 6
20 A
See Fuse Details
P128
Satellite Fuse
Box 2
B151
Theft Alarm LED
Z163
Theft Alarm Unit 14 C2254 C209 0.5 RW2 C269 1 C269 0.5 P S2061Z163
Theft Alarm Unit
0.5 WB80.5 BN15 C225
1615 C277
X213
Alarm Sensor
31 C483
0.5 B2 C483
E401
See Ground Dis-
tribution