Workshop Manuals Factory service & repair Land Rover
01 Introduction02 Multiport fuel injection (MFI-V8)03 Multiport fuel injection (MFI-T16)04 300Tdi05 300Tdi glow plug control06 Starting and charging07 Cruise control08 Ignition and shift interlock09 Anti-lock brake system10 Instruments11 Warnings and indicators12 Horns13 Radio (EXCEPT Japan)14 Radio (Japan)15 Front wipe/wash16 Rear wipe/wash17 Heated rear screen and mirror demisters18 Multi-function unit (MFU)19 Headlamps20 Headlamp levelling21 Side lamps22 Stop lamps23 Direction indicator lamps24 Reversing lamps25 Rear fog guard lamps26 Interior lamps27 Cigar lighter/clock28 Blower controls29 Compressor controls30 Cooling fans31 Drivers side32 LH front corner of engine compartment33 Central locking (EXCEPT Japan)34 Central locking (Japan)35 Power mirrors36 Trailer auxiliary socket37 Theft alarm system38 Power distribution39 Fuse details40 Ground distribution41 Component location table42 Component location views43 Connector views44 Harness routing
Land Rover Discovery Electrical Troubleshooting Manual (1995)37 · Theft alarm system
37 · General

Theft alarm system

Make
Land Rover
Model
Discovery Electrical Troubleshooting Manual
Year
1995
Section
Page › Theft alarm system
Theft alarm systemTheft alarm system

THEFT ALARM SYSTEM

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 hanset 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 of

E L E C T R I C A L

THEFT ALARM SYSTEM (EXCEPT JAPAN)

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 disabled.

T R O U B L E S H O O T I N G M A N U A L

3

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