Discovery 2. Manual — part 317

BODY CONTROL UNIT

DESCRIPTION AND OPERATION

86-3-9

IDM outputs
The IDM receives the following signals from the BCU using the serial datalink to provide power outputs:

Description

Signal type

System

Unlock all doors enable

Digital

Locking/ Unlocking/ Alarm

Lock passenger and rear doors enable

Digital

Locking/ Unlocking/ Alarm

Superlock all doors enable

Digital

Locking/ Unlocking/ Alarm

Lock driver's door

Digital

Locking/ Unlocking/ Alarm

Rear fog lamps enable

Digital

Exterior lighting

Daylight running lamps enable

Digital

Exterior lighting

LH direction indicators enable

Digital

Direction indicators/ Hazard warning/ Alarm

RH direction indicators enable

Digital

Direction indicators/ Hazard warning/ Alarm

Gear position indicator illumination

Digital

Illumination

Headlamp main beam indicator disable

Digital

Illumination

Front wiper enable

Digital

Wipers and washers

Rear wiper enable

Digital

Wipers and washers

Rear window enable

Digital

Power windows

Shift lever solenoid enable

Digital

Automatic gearbox

Transfer box solenoid enable/ Alarm sounder
relay

Digital

Gearbox

Heated rear window enable

Digital

Heated screens

BODY CONTROL UNIT

86-3-10 DESCRIPTION AND OPERATION

Diagnostic socket

RHD illustrated

The BCU has a serial connection to the diagnostic socket to allow unit interrogation using TestBook.

In addition to fault diagnosis, the BCU can be programmed with the following information:

l

Plip codes.

l

Options.

l

VIN code.

l

EKA code.

l

EEPROM locking.

The following manufacturing details are programmed into the BCU which can be accessed using TestBook:

l

Date of manufacture.

l

Hardware version number.

l

Unit serial number.

l

Odometer reading.

It is not possible to use the diagnostic bus to communicate with the BCU via TestBook when the security system is
active (except for passive immobilisation). This is a security measure to ensure that no key programming or market
configuration can take place if the operator is not in possession of a valid remote transmitter or the vehicle keys.

The BCU is normally programmed to accept two remote transmitters, but a further two remote handsets can be
programmed into the BCU and one optional Self Levelling Suspension (SLS) transmitter. All remote transmitters need
to be available if TestBook is to be used to re-configure the BCU.

M86 4705

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.

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.

Function

Option

Details