1999 LAND ROVER DISCOVERY transmission

RESTRAINT SYSTEMS
75-8 DESCRIPTION AND OPERATION
Diagnostic and Control Unit (DCU)
The SRS DCU is an electronic single point crash sensor. It is capable of sensing if a crash has taken place. If all the
relevant parameters are met, then the DCU deploys the airbag(s) and seat belt pretensioners.
The DCU is bolted to the transmission tunnel beneath the centre console in the area of the handbrake.
The DCU performs the following functions:
lInternal self test, system monitoring and fault detection.
lSRS warning lamp operation.
lSystem deployment.
Self test, system monitoring and fault detection
The DCU performs a self-test during start-up and then continually during operation of the system. The following
components are tested:
lThe decelerometer.
lThe electromechanical safing sensor.
lThe microprocessor.
lThe continuity of squib ignition circuits.
lThe SRS warning lamp.
If the DCU detects a fault, it stores the fault code in memory. Diagnose the DCU with TestBook. The DCU cannot
be serviced. It must be replaced if it is faulty.
SRS warning lamp operation
The DCU controls the SRS warning lamp contained in the instrument cluster.
System deployment
The DCU determines when the system deploys based on inputs from both the decelerometer and the
electromechanical safing sensor. Both are located within the DCU. Neither are serviceable.
The electromechanical safing sensor uses a magnet and ball bearing system to provide a mechanical confirmation of
vehicle deceleration. The ball bearing is held in place by the magnet. The strength of the magnet is calibrated such
that the force required for the ball bearing to move away from the magnet will only occur if the vehicle decelerates
suddenly, as in an accident.
The SRS deploys only if both the decelerometer reading and the safing sensor operation occur at the same time.

INTERIOR TRIM COMPONENTS
76-3-6 REPAIRS
7. Models with veneer trim: Release veneered
console cover and remove cigar lighter
element. Disconnect multiplugs from switch
pack and remove veneered console cover.
8.Remove 2 bolts securing forward edge of
console to transmission tunnel. 9.Release handbrake gaiter from console.
10.Remove clip and clevis pin securing cable to
handbrake lever.
11.Move handbrake to fully upward position.
12.Release electric seat switches from console.
13.Disconnect multiplugs from switches and
remove.
14.Remove 2 bolts securing rear of console to
transmission tunnel.
15.Release centre console from fascia.
16.Disconnect multiplug and bulb from cigar
lighter.

INTERIOR TRIM COMPONENTS
REPAIRS 76-3-7
17.Remove console.
NOTE: Do not carry out further dismantling if
component is removed for access only.
18.Remove 4 screws securing storage bin lid to
console and remove lid.
19.Release cigar lighter body from console and
remove.
Refit
1.Fit and secure cigar lighter body to console.
2.Fit lid to console and secure with screws.
3.Fit console.
4.Connect multiplug and bulb to cigar lighter.
5.Fit centre console to fascia.
6.Fit 2 bolts securing rear of console to
transmission tunnel.
7.Connect multiplugs to seat switches.
8.Fit switches to console.
9.Move handbrake to lowered position.
10.Fit cable to handbrake and secure with clevis
pin and clip.
11.Fit handbrake gaiter to console.
12.Fit bolts securing forward edge of console to
transmission tunnel.
13. Models with veneer trim: Position veneered
console cover and connect multiplugs to switch
pack. Fit cigar lighter element and secure
veneered console cover to console.
14. Models with base trim: Connect multiplugs to
switch pack, fit switch pack to console and
secure with screws.
15. Models with base trim: Fit cover plate to
switch pack, and rubber mat to console.
16.Fit transfer box gaiter and knob to lever.
17.Secure transfer box gaiter to console.
18.Connect multiplug to selector panel, fit and
secure panel to centre console.
19.Fit spacer and knob to gear selector lever.
20. Models from 03MY:Fit both centre console
cup holders.
Console - centre - manual models
$% 76.25.01
Remove
1.Release clips securing gear lever gaiter to
centre console and remove knob and gaiter.
2. Models from 03MY:Remove both centre
console cup holders.
3.Release clips securing transfer box lever gaiter
to centre console and remove knob and gaiter.

INTERIOR TRIM COMPONENTS
76-3-8 REPAIRS
4. Models with base trim: Remove rubber mat
from console and remove cover plate from
switch pack.
5. Models with base trim: Remove 4 screws
securing switch pack to centre console,
disconnect multiplugs and remove switch pack.6. Models with veneer trim: Release veneered
console cover from console and remove cigar
lighter element. Disconnect multiplugs from
switch pack and remove veneered console
cover.
7.Remove 2 bolts securing forward edge of
console to transmission tunnel.

INTERIOR TRIM COMPONENTS
REPAIRS 76-3-9
8.Release handbrake gaiter from console.
9.Remove clip and clevis pin securing cable to
handbrake.
10.Move handbrake to fully upward position.
11.Release electric seat switches from console.
12.Disconnect multiplugs from switches and
remove.
13.Remove 2 bolts securing rear of console to
transmission tunnel.
14.Release centre console from fascia.
15.Disconnect multiplug and bulb from cigar
lighter. 16.Remove console.
NOTE: Do not carry out further dismantling if
component is removed for access only.
17.Remove 4 screws securing storage bin lid to
console and remove lid.
18.Release cigar lighter body from console and
remove.
Refit
1.Fit and secure cigar lighter body to console.
2.Fit lid to console and secure with screws.
3.Fit console.
4.Connect multiplug and bulb to cigar lighter.
5.Fit centre console to fascia.
6.Fit 2 bolts securing rear of console to
transmission tunnel.
7.Connect multiplugs to seat switches.
8.Fit switches to console.
9.Move handbrake to lowered position.
10.Fit cable to handbrake and secure with clevis
pin and clip.
11.Fit handbrake gaiter to console.
12.Fit bolts securing forward edge of console to
transmission tunnel.
13. Models with veneer trim: Position veneered
console cover and connect multiplugs to switch
pack. Fit cigar lighter element and secure
veneered console cover to console.
14. Models with base trim: Connect multiplugs to
switch pack, fit switch pack to console and
secure with screws.
15. Models with base trim: Fit cover plate to
switch pack, and rubber mat to console.
16.Fit transfer gearbox gaiter and knob to lever.
17.Secure gaiter to console.
18.Fit knob and gaiter to gear lever and secure
gear lever gaiter to console with clips.
19. Models from 03MY:Fit both centre console
cup holders.

INTERIOR TRIM COMPONENTS
76-3-12 REPAIRS
20.Separate blue section from ICE multiplug.
21.Release coaxial cables from fascia panel.
22.Disconnect multiplug from passenger air bag.
23.Disconnect multiplug from blower motor.
24.Working through glove box aperture remove 2
bolts, or 4 bolts if passenger airbag module is
fitted, securing fascia to body.25.Remove 4 bolts securing lower edge of fascia
to mounting brackets on transmission tunnel.
26.Remove 4 bolts securing lower edge of fascia
to brackets on 'A' post.
27.With assistance carefully remove fascia from
vehicle.
28.If renewing fascia, transfer components to new
fascia as necessary.
Refit
1.With assistance carefully fit fascia and tighten
bolts securing lower edge of fascia to 26 Nm
(19 lbf.ft).
2.Tighten bolts securing fascia to body to 26 Nm
(19 lbf.ft).
3.Fit nuts securingfascia to steering column
bracket to 11 Nm (8 lbf.ft).
4.Secure coaxial cables to fascia and secure blue
multiplug to main ICE multiplug.
5. Models with A/C: Connect heater control
multiplug.
6. Models without A/C: Connect temperature
and air distribution inner cables to heater
control levers. Set temperature control knobs to
fully hot, distribution knob to demist position
and, with flap levers fully closed, secure outer
cables to clips on heater casing.
7.Connect multiplugs to blower motor and
passenger air bag (where fitted).
8.Fit glove box and secure with bolts.
9.Connect fascia harness multiplugs to main
harness and fuse box.
10.Position instrument pack and connect
multiplugs.

INTERIOR TRIM COMPONENTS
76-3-18 REPAIRS
Carpet - front
$% 76.49.02
Remove
1. Models with premium ICE: Remove power
amplifier.

+ IN CAR ENTERTAINMENT,
REPAIRS, Amplifier - power.
2. Models with premium ICE: Remove CD
autochanger.

+ IN CAR ENTERTAINMENT,
REPAIRS, CD autochanger.
3.Remove centre console.
lFor models with manual gearbox:

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Console - centre - manual
models.
lFor models with automatic gearbox:

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Console - centre - automatic
models.
4.Remove both lower 'A' post trim panels.
5.Remove finisher from both front carpet
retainers.
6.Remove 8 screws securing front carpet
retainers to floor.
7.Remove front carpet retainers.
8.Remove 2 nuts securing main body harness to
transmission tunnel.
9.With assistance release and remove carpet.Refit
1.With assistance position carpet.
2.Secure main body harness to transmission
tunnel with nuts.
3.Position front carpet retainers and secure to
floor with screws.
4.Fit finishers to front carpet retainers
5.Fit both lower 'A' post trim panels.
6.Fit centre console.
lFor models with manual gearbox:

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Console - centre - manual
models.
lFor models with automatic gearbox:

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Console - centre - automatic
models.
7. Models with premium ICE: Fit CD
autochanger.

+ IN CAR ENTERTAINMENT,
REPAIRS, CD autochanger.
8. Models with premium ICE: Fit power
amplifier.

+ IN CAR ENTERTAINMENT,
REPAIRS, Amplifier - power.

HEATING AND VENTILATION
DESCRIPTION AND OPERATION 80-5
Heater assembly
1Windscreen and side window air outlet
2Face level air outlet
3Casing
4Rear footwell air outlet
5Front footwell air outlet
6Drain outlet
7Air inlet8Engine coolant return
9Engine coolant feed
10Heater matrix
11RH temperature control cable
12Distribution control cable
13LH temperature control cable
The heater assembly heats and distributes air as directed by selections made on the control panel. The assembly is
installed on the vehicle centre-line, between the fascia and the engine bulkhead. The heater assembly consists of a
casing, formed from a series of plastic moldings, which contains a heater matrix and control flaps. Internal passages
integrated into the casing guide the air through the casing and separate it into two flows, one for the LH outlets and
one for the RH outlets. Two drain outlets at the bottom of the casing connect to overboard drain tubes installed in the
sides of the transmission tunnel.
Heater matrix
The heater matrix provides the heat source to warm the air being supplied to the distribution outlets. The heater matrix
is an aluminium two pass, fin and tube heat exchanger, installed in the RH side of the casing. Two aluminium tubes
attached to the heater matrix extend through the engine bulkhead to connect the heater assembly to the engine
coolant system. When the engine is running, coolant is constantly circulated through the heater matrix by the engine
coolant pump. On diesel models, the coolant flow is assisted by an electric pump while the FBH system is active.