Workshop Manuals Factory service & repair Land Rover
01 Discovery Series II - Workshop Manual - 1999MY ON - 6th Edition - NAS02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 INTRODUCTION32 33 GENERAL INFORMATION34 35 GENERAL DATA36 IDENTIFICATION NUMBERS37 38 TORQUE WRENCH SETTINGS39 40 LIFTING AND TOWING41 CAPACITIES, FLUIDS, LUBRICANTS AND SEALANTS42 43 44 MAINTENANCE45 46 ENGINE - V847 48 EMISSION CONTROL - V849 50 ENGINE MANAGEMENT SYSTEM - V851 FUEL DELIVERY SYSTEM - V852 53 COOLING SYSTEM - V854 55 MANIFOLDS AND EXHAUST SYSTEMS - V856 57 58 59 CLUTCH - V860 61 MANUAL GEARBOX - R38062 63 TRANSFER BOX - LT230SE64 65 66 AUTOMATIC GEARBOX - ZF4HP22 - 2467 PROPELLER SHAFTS68 69 REAR AXLE70 71 72 73 74 75 FRONT AXLE76 77 78 79 STEERING80 FRONT SUSPENSION81 82 83 REAR SUSPENSION84 85 86 87 BRAKES88 RESTRAINT SYSTEMS89 90 DOORS91 EXTERIOR FITTINGS92 93 INTERIOR TRIM COMPONENTS94 SCREENS95 96 97 SEATS98 99 SUNROOF100 CHASSIS AND BODY DIMENSIONS101 102 103 104 PANEL REPAIRS105 106 107 108 BODY SEALING MATERIALS109 110 111 112 113 CORROSION PREVENTION AND SEALING114 PAINTING115 HEATING AND VENTILATION116 117 AIR CONDITIONING118 119 WIPERS AND WASHERS120 CHARGING AND STARTING121 122 LIGHTING123 BODY CONTROL UNIT124 125 126 ALARM SYSTEM AND HORN127 128 WINDOWS129 IN CAR ENTERTAINMENT130 HARNESSES131 DRIVING AIDS132 NAVIGATION SYSTEM133 INSTRUMENTS
Land Rover Discovery II126 · ALARM SYSTEM AND HORN
126 · Electrical

ALARM SYSTEM AND HORN (Description): DESCRIPTION AND OPERATION (page 10 of 12)

Make
Land Rover
Model
Discovery II
Section
DESCRIPTION AND OPERATION
ALARM SYSTEM AND HORNDescription · page 10 of 12
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ALARM SYSTEM AND HORN

86-4-14 DESCRIPTION AND OPERATION

Battery Backed-up Sounder (BBUS)

The BBUS is located behind the rear quarter trim panel on the right hand side of the vehicle and is utilised as an 
additional alarm warning device.  It has a self contained power source allowing it to operate when the vehicle battery 
is disconnected.

NOTE: Always disarm the BBUS before carrying out any procedures related to the BBUS.

Input/Output
The BBUS utilises a 12 volts power supply from fuse 20 (15 amperes) located in the passenger compartment fusebox 
via a relay to charge the self contained battery.

When the alarm is triggered, the BCU is pulled high internally triggering the BBUS to sound continuously for 30 
seconds. 

The BCU sets the BBUS to its internal battery backed mode when the vehicle battery is disconnected.

If a mislock occurs the BCU triggers the BBUS for a period of 50 ms.

The BCU triggers the BBUS once for a period of 50 ms when an EKA code is requested.

When the EKA code is entered correctly, the BBUS will operate twice for a period of 50 ms on, 200 ms off.

The BBUS utilises a dedicated earth path.

Parts & tools for this job Staging For Land Rover Discovery

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