Discovery 2. Manual — part 736

BODY CONTROL UNIT

DESCRIPTION AND OPERATION 86-3-11

Programmable options
The BCU can be programmed with a number of options to satisfy specific market requirements and customer
preferences. The options can be set using TestBook.

Function

Option

Details

Transmission

Manual

The vehicle is fitted with manual transmission.

Automatic

The vehicle is fitted with automatic transmission.

Front fog lamps

None

The vehicle is not fitted with front fog lamps.

Main

The front fog lamps will operate if the headlamps are on main
beam.

No main

The front fog lamps will not operate if the headlamps are on main
beam.

Interlocks

None

The vehicle is not fitted with key, shift or transfer box interlocks.

Shift

The vehicle is fitted with key, shift and transfer box interlocks.

No transfer

The vehicle is fitted with key and shift interlocks, but not a transfer
box interlock.

Daylight running lamps

None

The vehicle is not fitted with daylight running lamps.

No main

The daylight running lamps are on if the headlamp main beams
are off.

No heads

The daylight running lights are on with headlamp main and dipped
beams off and the gearbox not in Park.

Programmed wash/ wipe Normal

The front wipers operate if the front wash is operated.

No wipe

The front wipers do not operate if the front wash is operated.

Key-in warning

Disabled

The ignition key in audible warning is disabled.

Enabled

The ignition key in audible warning is generated if the ignition key
is in and the driver's door is open.

Electric front seats

None

The vehicle is not fitted with electric front seats.

Normal

Electric seat adjustment is available for 45 seconds after the
driver's door opens or if the ignition is on.

Ignition II

Electric seat adjustment is available if the ignition is on.

Electric front windows

Driver cancel

The front windows will be disabled 44 seconds after the driver's
door is opened.

All cancel

The front windows will be disabled 44 seconds after any door is
opened.

No cancel

The front windows will be disabled when the ignition is turned off.

Heated front screen

Fitted

The vehicle is fitted with heated front screens.

None

The vehicle is not fitted with heated front screens.

Rear windows and
sunroof

Driver cancel

The rear windows and sunroof will be disabled 44 seconds after
the driver's door is opened.

All cancel

The rear windows and sunroof will be disabled 44 seconds after
any door is opened.

No cancel

The rear windows and sunroof will be disabled when the ignition
switch is turned off.

Gear position indicator
illumination

Always

The automatic gearbox selector illumination is on when the
ignition is on.

Sidelights

The automatic gearbox selector illumination is on when the
ignition is on and the sidelights are off.

Hill descent control

None

The vehicle is not fitted with hill descent control.

Fitted

The vehicle is fitted with hill descent control.

Courtesy headlamps

Disabled

The vehicle is not fitted with courtesy headlamps.

Enabled

The vehicle is fitted with courtesy headlamps.

Odometer error warning

Disabled

The odometer will not flash if there is an odometer error.

Enabled

The odometer will flash if there is an odometer error.

BODY CONTROL UNIT

86-3-12 DESCRIPTION AND OPERATION

Seatbelt warning lamp

Timed

The warning lamp is on for 6 seconds after the ignition is turned
on.

Buckle

The warning lamp is on for 6 seconds after ignition is turned on or
until the buckle is fastened.

Ignition II

If the buckle is unfastened when the ignition is turned on then the
warning lamp comes on for 6 seconds.

Disable

The warning lamp is not used.

Seatbelt audible warning

Timed

The audible warning is on for 6 seconds after the ignition is turned
on.

Buckle

The audible warning is on for 6 seconds after the ignition is turned
on or until the buckle is fastened.

Ignition II

If the buckle is unfastened when the ignition is turned on then the
audible warning is on for 6 seconds.

Disable

The audible warning is not used.

Bulb failure warning

Disabled

Direction indicator bulb failure detection is disabled.

Enabled

Direction indicator bulb failure detection is enabled.

Superlocking

None

Superlocking is not available.

Double

The vehicle will superlock on a double press of the remote
transmitter or double key turn.

Single

The vehicle will superlock on a single press of the remote
transmitter or a single key turn.

No key

The vehicle will superlock on a single press of the remote
transmitter but not with the key.

Door unlocking

Not SPE

The SPE (Single Point Entry) function is not used. All doors unlock
on a remote transmitter press.

SPE

Only the driver's door unlocks on the first remote transmitter press,
all other doors on the second press.

Alarm disarming

Always

Operation of the key in the driver's door always disarms the
vehicle.

Key only

Operation of the key in the driver's door only disarms the vehicle
if it was locked with the key.

Key never

The security system is not disarmed by the key (except for EKA).

Inertia switch

No hazards

Operation of the inertia switch does not operate the hazard
warning lamps.

Hazards

Operation of the inertia switch operates the hazard warning lamps.

Speed locking

Disabled

Speed related locking is disabled.

Enabled

Speed related locking is enabled. The door locks are disabled
when the vehicle is moving.

Volumetric sensing

Disabled

Volumetric sensing is disabled.

Enabled

Volumetric sensing is enabled.

Alarm

Disabled

The vehicle is not fitted with a security system.

Enabled

The vehicle is fitted with a security system.

Passive immobilisation

Disabled

Passive immobilisation is disabled.

Enabled

Passive immobilisation is enabled.

Hazard warning lamps

Disabled

The hazard warning lamps do not flash on security system arm,
disarm or trigger.

Enabled

The hazard warning lamps flash on security system trigger only.

All

The hazards flash on security system arm, disarm and trigger.

Mislocking audible
warning

Disabled

Mislock audible warnings are disabled.

Enabled

Mislock audible warnings are enabled.

Function

Option

Details

BODY CONTROL UNIT

DESCRIPTION AND OPERATION 86-3-13

Anti-theft system
The BCU controls the logical switching operations for enabling and activating the anti-theft system. Features include:

l

Perimetric protection – monitors the condition of doors and hinged panels.

l

Volumetric protection – monitors the vehicle's interior space.

l

Remote locking, superlocking and unlocking functions.

l

Engine immobilisation and remobilisation.

l

Advanced mislock detection and automatic compensation.

l

EKA code functions.

l

Customer configuration options.

l

Market configuration options.

Immobilisation
The immobilisation system comprises the following components:

l

RF receiver.

l

RF transmitter/ transponder.

l

Transponder coil.

l

BCU.

l

Door switches, door lock switches and bonnet switch.

l

IDM.

l

ECM.

l

Starter solenoid relay.

l

Status LED.

Alarm sounder

Alarm

Audible warnings are given by the security system sounder only.

Both

Audible warnings are given by both the security system sounder
and the vehicle horn.

Vehicle

Audible warnings are given by the vehicle horn only.

BBUS

Audible warnings are given by the security system sounder,
vehicle horn and BBUS.

Disabled

Audible warnings are not given.

Acclimatisation locking

Disabled

The vehicle cannot be locked if the ignition is on.

Enabled

The vehicle can be locked if the ignition is on and the engine is
running.

Alarm tamper

Disabled

The security system LED does not flash when the security system
has been tampered with.

Enabled

The security system LED flashes when the security system has
been tampered with.

Engine immobilised

LED off

The security system LED does not flash when the engine is
immobilised.

LED flash

The security system LED flashes when the engine is immobilised.

Low battery warning

Disabled

The security system LED does not flash when the remote
transmitter battery is low.

Enabled

The security system LED flashes when the remote transmitter
battery is low.

Emergency Key Access
(EKA)

Disabled

EKA is disabled.

Enabled

EKA is enabled and the door locks operate electrically.

No unlock

EKA is enabled, but the door locks do not operate electrically.

Function

Option

Details

BODY CONTROL UNIT

86-3-14 DESCRIPTION AND OPERATION

Alarm system
The alarm system comprises the following components:

l

RF receiver.

l

RF transmitter.

l

BCU.

l

IDM.

l

Door switches, door lock switches and bonnet switch.

l

Battery backed-up sounder (BBUS).

l

Status LED.

On non NAS vehicles, power supply for the alarm sounder and the battery BBUS is provided through two relays in the
passenger compartment fuse box. Each of the coils of the alarm relays are directly connected to the IDM which
controls their operation under the direction of BCU signals received via the serial data bus.

On NAS vehicles, an audible warning is provided through operation of the vehicle horns. The BCU provides an earth
path for the coil of the horn relay to initiate vehicle horn operation.

+

ALARM SYSTEM AND HORN, DESCRIPTION AND OPERATION, Description.

Central Door Locking (CDL)
The BCU carries out the logic control operation for CDL. A CDL switch is mounted on the fascia panel and has two
inputs to the BCU, one for lock and one for unlock.

Door locking and unlocking can be performed using the remote transmitter in the keys and the receiver unit located
above the vehicle's headlining, behind the rear sunroof aperture. The receiver detects the signals sent from the
remote transmitter and sends a decoded signal to the BCU for processing.

Four methods of door locking are available:

l

Remote handset locking.

l

Vehicle key locking.

l

CDL switch locking.

l

Speed related locking.

Two security levels of door locking are available, CDL and Superlocking. The anti-theft alarm system works in
conjunction with the CDL system.

Electric windows and sunroof
The BCU controls the logical operations and the timing periods for the electric front windows. The rear windows are
hard-wired and the two electric sunroofs are controlled by a dedicated ECU which is enabled by the BCU.

The front windows are electrically operated using two rocker switches located in the centre console. Electric motors
are located in each of the front doors.

The rear windows are enabled by the IDM controlling the operation of the rear window relay located in the passenger
compartment fuse box.

Wipers and washers
The wiper and washer functions are controlled by the BCU and the IDM.

The front wipers and washers are operated from the switch stalk located on the right hand side of the steering column
and only operate when the ignition switch is in position I or II. The front wipers are operated by a motor located below
the windscreen plenum.

+

WIPERS AND WASHERS, DESCRIPTION AND OPERATION, Description.