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

							ELECTRICAL TROUBLESHOOTING MANUAL
ETM T1
Theft Alarm System
31
DISCOVERY


 	
 

 	
 
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							ELECTRICAL TROUBLESHOOTING MANUA L
T1 ETM
Theft Alarm System
32
DISCOVERY
 

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							ELECTRICAL TROUBLESHOOTING MANUAL
ETM T1
Theft Alarm System
33
DISCOVERY
	 
 	 
 




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							THEFT ALARM SYSTEM (NAS 1995)
1
ETM T2
DISCOVERY
ELECTRICAL TROUBLESHOOTING MANUAL
CIRCUIT OPERATION
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
15. Theft Alarm Unit (Z163) and Theft Alarm Relay
(K159)
16. Alarm Bonnet Switch (X212)
17. Tailgate Switch (X170)
18. Horns (K128, K134) and Horn Relay (K189)
19. Theft Alarm LED (B151)
20. Front Door Key Switches (X201, X202)
21. Lock Actuators (M114, M122, M117, M125,
M132)
22. 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.
Horns  (K128, K134)
When an intrusion is detected the Horns (K128,
K134) will sound intermittently and the hazard
lights flash (where territorial regulations allow) for
30 seconds. The alarm must be retriggered before
the Horns (K128, K134) will sound again.
Interior Lights
When the doors are unlocked by the Theft Alarm
Unit (Z163), the interior lights are also turned on.
This helps to prevent unauthorized entry, in poor
lighting conditions, after the system has been
disarmed. 
						

							THEFT ALARM SYSTEM (NAS 1995)
2
T2 ETM
DISCOVERY
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.
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.
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 ECU/Handset:
315.0 MHz, Green/green 
						

							THEFT ALARM SYSTEM (NAS 1995)
3
ETM T2
DISCOVERY
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.  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.
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 of
short 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 (NAS 1995)
4
T2 ETM
DISCOVERY
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.
HANDSET INITIALISATION
New handsets are supplied in pairs.  If a new
handset is required, it will require initialisation to the
Theft Alarm Unit (Z163) using the following
procedure:
1. Starting conditions: ignition off, doors unlocked,
bonnet switch depressed.
2. Carry out instructions 3 to 9 within 8 seconds.
3. Switch ignition ON.
4. Switch ignition OFF.
5. Lock doors.
6. Unlock doors.
7. Release bonnet switch.
8. Switch ignition ON.9. Switch ignition OFF.
If alarm is correctly accessed, horn will sound and
LED will light.  It is now possible to programme two
handsets of correct frequency to vehicle alarm
ECU.  This must be carried out within two minutes.
10. Press and hold down button on first handset
until dash LED flashes.
11. Repeat instruction 10. for second handset.
12. The LED will extinguish if both handsets have
been initialised correctly. 
						

							ELECTRICAL TROUBLESHOOTING MANUAL
ETM T2
Theft Alarm System (NAS 1995)
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
T2 ETM
Theft Alarm System (NAS 1995)
6
DISCOVERY


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							ELECTRICAL TROUBLESHOOTING MANUAL
ETM T2
Theft Alarm System (NAS 1995)
7
DISCOVERY
T2±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
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