1999 LAND ROVER DISCOVERY wheel

RESTRAINT SYSTEMS
75-4 DESCRIPTION AND OPERATION
Driver airbag module
The driver airbag module is located in the steering wheel and is controlled by the DCU. A bag within the module
inflates to protect the driver in the event of a collision severe enough to deploy the system.
The driver airbag module connects to the steering column wiring harness via a rotary coupler.
Within the driver airbag module is a squib which, when given the correct current by the DCU, inflates the airbag by
initiating a chemical reaction. In deployment, the airbag inflates within a fraction of a second and then deflates at a
controlled rate as the weight of the driver presses against the bag. Vents in the bag control airbag deflation.
The DCU regularly applies a test current to the driver airbag squib to confirm continuity of the ignition circuitry.
The DCU is capable of detecting a short to ground, a short to battery and an open circuit for the driver airbag module
squib. It will also identify if the configuration of the DCU differs from that actually fitted to the vehicle.
The DCU also stores the following additional information on each fault:
lA count indicating the number of times the fault has occurred.
lA start time and an end time for the fault to indicate duration of the fault.

RESTRAINT SYSTEMS
DESCRIPTION AND OPERATION 75-11
DESCRIPTION AND OPERAT ION
Description - seat belts
An inertia reel, three point seat belt is installed at each seat position. The inertia reels incorporate a liftshaft locking
system with webbing sensor and car sensor activating mechanisms. The webbing sensor activates the locking system
if the webbing is subjected to a sharp pull. The car sensor activates the locking system if the vehicle is subjected to
sudden deceleration or a severe tilt angle.
Front seat belts
The inertia reel of each front seat belt is attached to the related B/C post, behind the finishers. The webbing runs from
the inertia reel, through a height adjuster, to an anchor point at the base of the B/C post. The buckle assembly for
each belt is attached to the inboard side of the seat and contains the SRS pretensioner.
Rear seat belts
The inertia reels for the outboard rear seats are attached to the body behind the loadspace side trim casings. The
webbing runs from each inertia reel through an upper mounting, suspended from the cantrail, to an anchor point on
the rear wheel arch.
The inertia reel of the centre rear seat is mounted in the back of the seat. The webbing runs through a guide on the
top of the seat and is anchored to one of the seat hinge points. The buckles for the rear seat belts are also attached
to the seat hinge points.
Third row seat belts
The inertia reel of each third row rear seat belt is attached to the related E post, behind the loadspace side trim
casing.The webbing runs from the inertia reel, through an upper mounting on the E post to an anchor point on the
loadspace floor. The buckle is mounted on the inboard side of the seat.

RESTRAINT SYSTEMS
75-22 REPAIRS
Airbag module - drivers
$% 76.74.01
WARNING: It is imperative that before any work
is undertaken on the SRS system the appropriate
information is read thoroughly.
WARNING: Always disconnect both battery leads
before beginning work on the SRS system.
Disconnect the negative battery lead first. Never
reverse connect the battery.
Remove
1.Remove the key from the starter switch.
Disconnect both battery leads, negative lead
first. Wait ten minutes before starting work.
2.Remove 2 Torx bolts securing air bag module
to steering wheel.
3.Release air bag module from steering wheel.
CAUTION: Do not allow the air bag module
to hang by the air bag harness.
4.Disconnect multiplug from air bag module. 5.Remove air bag module.
WARNING: Store the airbag module with the
deployment side uppermost. If it is stored
deployment side down, accidental
deployment will propel the airbag module
with enough force to cause serious injury.
WARNING: Store the airbag module or seat
belt pre-tensioner in a designated storage
area. If there is no designated storage area
available, store in the locked luggage
compartment/loadspace of the vehicle and
inform the workshop supervisor.
Refit
NOTE: If the airbag module is to be replaced,
the bar code of the new module must be
recorded.
1.Position air bag module and connect multiplug.
2.Fit air bag module to steering wheel and tighten
Torx bolts to 9 Nm (7 lbf.ft).
3.Connect battery leads, earth lead last.

RESTRAINT SYSTEMS
REPAIRS 75-25
Air bag - steering wheel - deployment -
off vehicle
$% 76.74.16
These guidelines are written to aid authorised
personnel to carry out the safe disposal of air bag
modules when removed from the vehicle.
Deploy
It is imperative that before any work is
undertaken on the SRS system, the
appropriate information is read thoroughly.
1.Check condition of deployment tool LRT-86-
003 and associated fly leads.
2.Position LRT-86-007/02 in vice, ensuring that
vice jaws grip tool above the bottom flange to
prevent possibility of tool being forced upwards
during detonation. Tighten vice.
3.Fit and secure 2 off LRT-86-007/05 to LRT-86-
007/02.4.Fit and secure air bag to LRT-86-007/05.
5.Connect deployment tool fly lead LRT-86-003/
08 to air bag.
6.Connect deployment tool LRT-86-003 to
deployment tool fly lead LRT-86-003/08.
7.Connect deployment tool LRT-86-003 to
battery.
WARNING: Ensure all personnel are at least
15 metres (50 feet) away from the air bag
module.
8.Press deployment tool operating button to
deploy air bag module.
9.Disconnect deployment tool from battery.
WARNING: During deployment parts of the
air bag module become hot enough to burn
you. Wait 30 minutes after deployment
before touching the air bag module.
10.Disconnect deployment tool fly lead from air
bag.
11.Remove air bag module from holding tools and
place in a sealed bag, ready for disposal.
NOTE: Do not transport deployed SRS
components in the vehicle passenger
compartment.
12.Wipe down holding tools with a damp cloth and
remove from vice.
13.Transport deployed air bag module to
designated area for incineration.
14. Do not re-use or salvage any parts of the
SRS system.

RESTRAINT SYSTEMS
REPAIRS 75-29
Rotary coupler
$% 76.74.20
WARNING: It is imperative that before any work
is undertaken on the SRS system the appropriate
information is read thoroughly.
WARNING: Always disconnect both battery leads
before beginning work on the SRS system.
Disconnect the negative battery lead first. Never
reverse connect the battery.
Remove
1.Remove the key from the starter switch.
Disconnect both battery leads, negative lead
first. Wait ten minutes before starting work.
2.Remove steering wheel.

+ STEERING, REPAIRS, Steering
wheel.
3.Remove steering column nacelle.

+ STEERING, REPAIRS, Nacelle -
steering column.4.Release rotary coupler multiplug from bracket
and disconnect from harness.
5.Disconnect rotary coupler multiplug from
harness.
6.Remove rotary coupler.
Refit
1.Fit rotary coupler to steering column and
connect multiplug to harness.
2.Connect rotary coupler multiplug to harness
and secure to bracket.
3.Fit steering column nacelle.

+ STEERING, REPAIRS, Nacelle -
steering column.
4.Fit steering wheel.

+ STEERING, REPAIRS, Steering
wheel.

DOORS
REPAIRS 76-1-3
Door - tail
$% 76.28.19.99
Remove
1.Remove spare wheel from tail door.
2.Remove tail door trim casing.

+ DOORS, REPAIRS, Trim casing - tail
door.
3.Carefully release water shedder from tail door.
4.Disconnect multiplug from door latch.
5.Disconnect multiplug from rear wiper motor.
6.Disconnect 2 Lucars from Heated Rear
Window (HRW).
7.Disconnect multiplug from number plate lamp.
8.Remove 2 screws securing Centre High
Mounted Stop Lamp (CHMSL) cover to tail door
glass.
9.Remove CHMSL cover.
10.Disconnect 2 Lucars from CHMSL.
11.Attach draw string to CHMSL wires and draw
wires through tail door. Disconnect draw string
from wires.
12.Tape draw string in tail door to retain its
position.
13.Release washer tube from rear of wiper arm. 14.Release 3 clips securing harness to tail door.
15.Release harness sleeve from door outer edge
and feed harness and washer tube through
door.
16.Remove spring clip securing check strap to tail
door aperture and collect washer.
17.Mark position of hinges.
18.Support the tail door on a jack, using a block of
wood to protect the door.
19.Remove 6 bolts securing tail door hinges to
body and, with assistance, remove tail door.

DOORS
76-1-4 REPAIRS
Refit
1.Support the tail door on a jack, using a block of
wood to protect the door.
2.With assistance position door. Fit securing
bolts but do not tighten at this stage.
3.Fit washer and spring clip securing check strap
to aperture.
4.Adjust position of tail door in relation to
aperture, ensuring gaps around all 4 edges
are consistent, and door closes cleanly onto
dove tail.
5.When tail door is correctly adjusted, tighten tail
door hinge bolts to 34 Nm (25 lbf.ft).
6.Feed harness and washer tube through outer
edge of door and connect harness sleeve to
door.
7.Secure harness to tail door with clips.
8.Connect washer tube to rear of wiper arm.
9.Remove tape from draw string and secure to
CHMSL wires.
10.Draw wires through tail door and connect
Lucars to CHMSL.
11.Fit CHMSL cover and secure with screws.
12.Connect multiplug of number plate lamp.
13.Connect Lucars to HRW.
14.Connect multiplug to rear wiper motor.
15.Connect multiplug to door latch.
16.Fit water shedder to door.
17.Fit tail door trim casing.

+ DOORS, REPAIRS, Trim casing - tail
door.
18.Fit spare wheel to tail door.

EXTERIOR FITTINGS
REPAIRS 76-2-1
EXTERIOR FITTINGS REPAIRS
Wing - front - up to 03MY
$% 76.10.24
Remove
1.Remove front repeater lamp.

+ LIGHTING, REPAIRS, Lamp - front
repeater - up to 03MY.
2.Remove front wheel arch liner.

+ EXTERIOR FITTINGS, REPAIRS,
Liner - wheel arch - front.
3.Remove 5 screws securing wheel arch liner
extension to bumper valance and remove liner.
4.Remove side repeater lamp from wing,
disconnect multiplug and remove lamp.5.Remove bolt securing front of wing to bracket
on body.
6.Remove screw securing headlamp surround
panel to wing.
7.Remove nut securing wing to bracket on sill
finisher.