Discovery 2. Manual — part 749

ALARM SYSTEM AND HORN

DESCRIPTION AND OPERATION 86-4-23

Depending on which market the vehicle is sold, either the vehicle horn, a specific alarm sounder, or a BBUS operates
in phase with the direction indicators when the alarm is triggered. The audible warning device operates for
approximately 30 seconds at 0.25 second on, and 0.25 second off. The BCU allows the alarm to be triggered up to 3
times in any armed period.

Theft deterrent LED
An LED located in the instrument pack indicates the status of the alarm system.

There are eight theft deterrent alarm configurations:

l

No handset low battery warning.

l

Handset low battery warning.

l

No passive immobilisation.

l

Passive immobilisation.

l

Engine immobilised (ignition off, LED off).

l

Engine immobilised (ignition off, LED flashes).

l

No alarm tampered indication.

l

Alarm tampered indication.

The theft deterrent LED utilises a particular flash to show the status of the following:

l

Alarm armed.

l

Engine immobilised.

l

Alarm tampered.

l

Handset low battery warning.

Transit mode
To prevent excessive battery drain during transportation to overseas markets, the vehicle is placed in a transit mode
at the end of line test.

The following functions are disabled when the vehicle is in transit mode:

l

Volumetric sensors.

l

Passive immobilisation.

l

Mobilisation of the vehicle by use of door lock.

l

Ignition key interlock.

l

Electric seat enable time-out with drivers door open.

To exit this mode, switch on the ignition and simultaneously hold down the heated rear window and the rear fog lamp
switch for 2 seconds.

Transit mode can be entered using Testbook.

ALARM SYSTEM AND HORN

86-4-24 DESCRIPTION AND OPERATION

ALARM SYSTEM AND HORN

REPAIR 86-4-25

REPAIR

Switch - central door locking

$% 86.26.30

Remove

1. Carefully remove clock assembly from louvre

panel.

2. Disconnect multiplug from door lock switch.
3. Remove door lock switch from clock.

Refit

1. Fit door lock switch to clock assembly.
2. Connect multiplug to door lock switch.
3. Position clock assembly and push to secure in

position.

Switches - horn

$% 86.30.01

Remove

WARNING: It is imperative that before any
work is undertaken on the SRS system the
appropriate information is read thoroughly.

1. Disconnect both battery leads, negative lead

first, and wait 10 minutes.

2. Remove driver's airbag module.

+

RESTRAINT SYSTEMS, REPAIRS,

Airbag module - drivers.

3. Release horn switch multiplugs and leads from

steering wheel base.

4. Disconnect horn switch multiplugs from

harness.

5. Disconnect horn switch multiplug from rotary

coupler harness.

6. Remove screw securing earth leads to steering

wheel.

7. Using a broad round edged tool, carefully prise

horn switches from steering wheel.

Refit

1. Fit to steering wheel and connect multiplugs.
2. Fit earth leads and secure with screw.
3. Secure leads and multiplugs to base of steering

wheel.

4. Fit driver's airbag module.

+

RESTRAINT SYSTEMS, REPAIRS,

Airbag module - drivers.

ALARM SYSTEM AND HORN

86-4-26 REPAIR

Vehicle horn

$% 86.30.10

Remove

1. Remove front grille.

+

EXTERIOR FITTINGS, REPAIRS,

Grille - front - up to 03MY.

2. Disconnect multiplug from horn.
3. Remove nut securing horn to body and remove

horn.

Refit

1. Fit horn to body and tighten nut to 13 Nm (10

lbf.ft).

2. Connect multiplug to horn.
3. Fit front grille.

+

EXTERIOR FITTINGS, REPAIRS,

Grille - front - up to 03MY.

Sounder - alarm

$% 86.77.10

Remove

1. Remove nut securing sounder to mounting

bracket.

2. Release sounder from mounting bracket,

disconnect multiplug and remove sounder.

Refit

1. Position sounder and connect multiplug.
2. Fit sounder to bracket and secure with nut.