Workshop Manuals Factory service & repair Land Rover
01 02 WORKSHOP MANUAL SUPPLEMENT03 04 CONTENTS05 06 CONTENTS07 INFORMATION08 09 INTRODUCTION10 GENERAL SPECIFICATION DATA11 ENGINE TUNING DATA12 GENERAL FITTING REMINDERS13 MAINTENANCE14 ENGINE15 EMISSION CONTROL16 ENGINE MANAGEMENT SYSTEM17 FUEL SYSTEM18 COOLING SYSTEM19 MANIFOLD AND EXHAUST SYSTEM20 CLUTCH21 MANUAL GEARBOX22 TRANSFER GEARBOX23 PROPELLER SHAFTS24 STEERING25 FRONT SUSPENSION26 REAR SUSPENSION27 BRAKES28 CHASSIS AND BODY29 PANEL REPAIRS30 AIR CONDITIONING31 WIPERS AND WASHERS32 ELECTRICAL33 INSTRUMENTS
Land Rover TD5 Defender32 · ELECTRICAL
32 · Electrical

ANTI-THEFT ALARM - FROM 02MY (page 2 of 9)

Make
Land Rover
Model
Defender TD5 Defender
ELECTRICALANTI-THEFT ALARM - FROM 02MY · page 2 of 9
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86

ELECTRICAL

4

DESCRIPTION AND OPERATION

Door and Bonnet Switches

The bonnet switch is located at the rear of the bonnet aperture on the bulkhead. The door switches are located on
the ’A’ posts for the front doors, the ’B’ posts for the rear doors and on the inside face of the tail door aperture.

The drivers door switch and the bonnet switch are connected to the anti-theft alarm ECU on individual single
wires. The remaining passenger doors and, if applicable, the tail door are jointly connected on a single wire to the
ECU. If a fault occurs which involves incorrect mislock signals, alarm triggers and interior lamp operation, the door
switch earth may be the cause of incorrect operation.

If any door or the bonnet is opened, the switch closes and completes an earth path to the anti-theft alarm ECU.
This completed earth path input is sensed by the ECU, which, if armed, will sound the BBUS or alarm sounder.
The ECU also controls, via the door switches and ignition on/off signals, the operation of the interior lamps.

Parts & tools for this job Staging For Land Rover Defender

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