1999 LAND ROVER DISCOVERY light

LIGHTING
REPAIRS 86-2-9
Motor - headlamp levelling
$% 86.41.16
Remove
1. For RH headlamp levelling motor: Release
fixings and remove battery cover.
2.Remove headlamp access cover.
3.Release headlamp from adjuster pin sockets. 4.Rotate and remove motor from body panel.
5.Disconnect multiplug from motor.
6.Remove headlamp levelling motor.
Refit
1.Position new headlamp levelling motor and
connect multiplug.
2.Fit motor to body panel.
3.Fit headlamp to adjuster pins.
4.Check headlamp beam alignment.

+ LIGHTING, ADJUSTMENTS,
Headlamps beam alignment - up to 03MY.
5.Fit headlamp access cover.
6. For RH headlamp levelling motor: Fit and
secure battery cover with fixings.

LIGHTING
86-2-10 REPAIRS
Lamp - stop - centre high mounted
(CHMSL)
$% 86.41.32
Remove
1.Remove 2 screws securing lamp cover and
remove cover.
2.Disconnect Lucar connectors from lamp bulb
holder.
3.Remove 2 nuts securing lamp to rear screen
and remove lamp.
Refit
1.Fit new lamp to screen and secure with nuts.
2.Connect Lucar connectors to lamp bulb holder.
3.Fit lamp cover to lamp and secure with screws.
Lamp - tail/flasher - bumper
$% 86.41.42
Remove
1.Release tail lamp from bumper.
2.Disconnect multiplug and remove lamp.
Refit
1.Position tail lamp, connect multiplug and
secure lamp to bumper.

LIGHTING
REPAIRS 86-2-11
Lamp - interior - front
$% 86.45.09
Introduction
This procedure is also applicable for removal and
fitting of the loadspace lamp.
Remove
1.Remove interior lamp lens.
2.Remove two nuts securing lamp.
3.Release lamp and disconnect multiplug.
4.Remove lamp.
Refit
1.Position new lamp and connect multiplug.
2.Fit lamp and secure with nuts.
3.Fit interior lamp lens.
Lamp - interior - rear
$% 86.45.18
Remove
1.Release lamp from headlining.
2.Disconnect multiplug and remove lamp.
Refit
1.Position interior lamp and connect multiplug.
2.Fit lamp to headlining.

LIGHTING
86-2-12 REPAIRS
Rheostat - panel lights dimmer
$% 86.65.37
Remove
1.Remove 2 screws securing instrument cowl to
fascia and release the cowl from the retaining
clips.
2.Disconnect 8 multiplugs from the instrument
cowl switches.
3.Remove the instrument cowl.4.Remove 2 screws securing the dimmer switch
to the instrument cowl and remove the dimmer
switch.
Refit
1.Fit the dimmer switch to the instrument cowl
and secure with screws.
2.Position the instrument cowl to the fascia and
connect the multiplugs.
3.Fit the instrument cowl to the fascia and secure
with screws.

LIGHTING
REPAIRS 86-2-13
Switch - hazard warning
$% 86.65.50
Remove
1.Carefully remove switch.
2.Disconnect multiplug from switch.
3.Remove switch.
Refit
1.Connect multiplug switch.
2.Position switch and push to secure.
Switch - indicator and exterior lighting -
combined
$% 86.65.55
WARNING: Always remove the key from the
starter switch, disconnect the vehicle battery and
wait 10 minutes before commencing work on the
SRS system.
Remove
1.Remove rotary coupler.

+ RESTRAINT SYSTEMS, REPAIRS,
Rotary coupler.
2.Remove 2 screws securing switch.
3.Carefully raise edge of switch bracket to clear
location peg and release switch from bracket.
4.Disconnect 2 multiplugs and remove switch.
Refit
1.Position switch and connect multiplugs.
2.Fit switch to bracket and secure with screws.
3.Fit rotary coupler.

+ RESTRAINT SYSTEMS, REPAIRS,
Rotary coupler.

LIGHTING
86-2-14 REPAIRS
Socket - accessory
$% 86.65.62
Remove
1.Remove screw securing accessory socket
escutcheon to loadspace side trim casing.
2.Release accessory socket assembly from trim
casing.
3.Disconnect multiplug and bulb from accessory
socket.
4.Remove accessory socket.
5.Release bulb holder from accessory socket.
Release accessory socket from escutcheon.
Refit
1.Fit accessory socket to escutcheon.
2.Fit bulb holder to accessory socket.
3.Position accessory socket to trim casing and
connect multiplug and bulb.
4.Fit accessory socket to trim casing and secure
with screw.
Switch - front/rear fog lamps
$% 86.65.65
Remove
1.Carefully remove switch from instrument cowl.
2.Disconnect multiplug and remove switch.
Refit
1.Position switch and connect multiplug.
2.Carefully push switch into instrument cowl.

BODY CONTROL UNIT
DESCRIPTION AND OPERATION 86-3-1
BODY CONTROL UNIT DESCRIPTION AND OPERAT ION
Description
General
The Body Control Unit (BCU) is located behind the passenger glovebox and is connected to the main harness by four
connectors on its bottom edge and an additional connector located on the side of the BCU casing. Mounting the BCU
behind the fascia makes it reasonably inaccessible for intruders to disable the anti-theft system.
The BCU uses solid-state microprocessor control to perform logical operations and timing functions for a variety of
the vehicle's electrically operated systems, these include:
lDoor locking.
lAnti-theft alarm and immobilisation system.
lExterior lighting including direction indicators and hazard warning lamps.
lCourtesy lighting.
lWipers and washers.
lElectric windows and sunroof.
lHeated windows.
The BCU also communicates with several other electronically controlled systems such as the EAT ECU and SLABS
ECU and also has a datalink between the Intelligent Driver Module (IDM) and the instrument pack. The datalink is a
low speed bus capable of transmitting and receiving messages at a data rate of 10,400 bits per second. Additional
inputs and outputs to peripheral devices are included which are necessary for determining vehicle status for particular
logical operations e.g. crank, ignition key inserted, fuel flap enable etc.
The BCU receives its power supply from the engine compartment fuse box, and is protected by a 10 A fuse.
The BCU communicates with the IDM to provide the control signals to perform power switching operations in
conjunction with dedicated relays.
IDM
The IDM is integrated into the passenger compartment fuse box, which is mounted behind the fascia below the
steering column. There are no harnesses between the fuse box and the IDM. The IDM performs the power switching
operations for several of the vehicle's electrical systems.
The IDM communicates with the BCU and the instrument pack via a serial interface. If the BCU or the IDM is replaced,
the communications link between the two units has to be re-established. This can be done either by switching on the
ignition and leaving it on for five minutes, or by using TestBook. The vehicle immobilisation will remain active until the
communications link between the BCU and IDM has been re-established.
Transit mode
To prevent excessive battery drain during transit to overseas markets, the vehicle is placed in a transit mode. The
following functions are disabled when the vehicle is in transit mode:
lVolumetric sensors.
lPassive immobilisation.
lImmobilisation of the vehicle by use of door lock.
lIgnition key interlock.
lElectric seat enable time-out with driver's door open.

BODY CONTROL UNIT
86-3-8 DESCRIPTION AND OPERATION
C0664 connector pin details
IDM inputs
The IDM inputs are communicated to the BCU using the serial datalink so that the BCU can perform the necessary
logic operations:
The V
in for IDM digital signals are defined as follows:
lLogic 1 when V
in ≥ 8V.
lLogic 0 when V
in ≤ 2V.
IDM input voltages between 2 and 8 volts are indeterminate and cannot be guaranteed.
Pin No. Description Input/Output
1 Front left window down Output
2 Front right window down Output
3 Fuel flap release Output
4 Front left window up Output
5Earth -
6 Front right window up Output
7 Battery power supply Input
Description Signal type System
Inertia switch Digital Locking/ Unlocking/ Alarm
Side lamps Digital Exterior lighting
Headlamp dipped beam Digital Exterior lighting
Headlamp main beam daylight running lamps Analogue Exterior lighting
RH direction indicators current sense Analogue Direction indicators/ Hazards/ Alarm
LH direction indicators current sense Analogue Direction indicators/ Hazards/ Alarm
Front wiper park sense Digital Wipers and washers