wheel LAND ROVER DISCOVERY 1999 Workshop Manual

SEATS
76-5-4 DESCRIPTION AND OPERATION
Description - electric seats
General
All markets use the same electric seat system. Electically operated lumbar support is optional. The system consists
of an electrical sub-system and a mechanical sub-system.
The electrical sub-system consists of the following components:
lBCU.
lSeat power relays.
lSeat switch packs.
lSeat fore/ aft motors.
lSeat cushion front up/ down motors.
lSeat cushion rear up/ down motors.
lSeat squab motor.
lLumbar pump.
lLumbar deflate solenoid.
The mechanical sub-system consist of the following components:
lGear wheels.
lRack and pinion assemblies.
Seat power relay
Located beneath the seat, the seat power relay supplies battery voltage to the satellite fuse box. Operation of the
relays is controlled by the BCU.
Voltage to the seat power relays is from fuse 5 in the engine compartment fuse box. The BCU controls the earth for
the relay coils. Operating the seat power relays provides voltage to the satellite fuse box under each seat.
Satellite fuse box
Located beneath the seat, the satellite fuse box provides circuit protection for the wiring to the seat switches and
motors. It also protects the lumbar inflate and deflate circuits.
The seat power relay provides voltage directly to the 40A fuse in the satellite fuse box. Voltage from this fuse feeds
the seat switch pack. The 3A fuses in the satellite fuse box protect the wiring to the lumbar pump and lumbar deflate
solenoid. Voltage to the 3A fuses comes from the seat switch pack.

SEATS
76-5-8 DESCRIPTION AND OPERATION
Operation - electric seats
Seat power relay enable line
The BCU provides the seat power relays with an earth supply to the relay coil that enables the relay operation. When
this seat power relay enable line is active, the seat power relay energises allowing seat operation.
In order for the seat power relay to be active the BCU must detect either of the following condition options:
lIgnition switch in position II.
lIgnition switch in position II or driver's door within 45 seconds of opening.
Seat fore/ aft movement
When the cushion switch is operated and the seat power relay enable line is operating, power and earth are supplied
to the motor in the seat, allowing the seat to move forward or backward depending on switch position. The motor
drives a gear wheel along a gear rack connected to the seat base. Sliding the cushion switch forward causes the motor
to drive the seat forward. Sliding the cushion switch rearward reverses polarity of the voltage at the seat motor, driving
the seat rearward.
Seat cushion front up/ down movement
When the cushion switch is operated and the seat power relay enable line is operating, power and earth are supplied
to the motor in the seat, allowing the front of the seat cushion to move upward or downward depending on switch
position. The motor drives a gear wheel along a gear rack connected to the seat base. Sliding the front of the cushion
switch upward causes the motor to drive the seat upward. Sliding the front of the cushion switch downward reverses
polarity of the voltage at the seat motor driving the seat downward.
Seat cushion rear up/ down movement
When the cushion switch is operated and the seat power relay enable line is operating, power and earth are supplied
to the motor in the seat, allowing the seat to move upwards or downwards depending on switch position. The motor
drives a gear wheel along a gear rack connected to the seat base. Sliding the rear of the cushion switch upward
causes the motor to drive the seat upward. Sliding the rear of the cushion switch downward reverses polarity of the
voltage at the seat motor driving the seat downward.
Squab fore/ aft movement
When the squab switch is operated and the seat power relay enable line is operating, power and earth is supplied to
the motor in the squab, allowing the squab to move forward or backward depending on switch position. The motor
drives a gear wheel along a rotary gear rack connected to the squab. Sliding the squab switch forward causes the
motor to drive the squab forward. Sliding the squab switch rearward reverses polarity of the voltage at the seat motor
driving the squab rearward.
Lumbar inflate/ deflate
Sliding the squab switch upwards when the seat power relay enable line is operating applies voltage to the lumbar
pump. The lumbar pump inflates the lumbar bladder, increasing lumbar support. The lumbar pump and the normally
closed lumbar deflate solenoid hold the air in the bladder. Sliding the squab switch downwards applies voltage to the
deflate solenoid, venting the air in the lumbar bladder to atmosphere, decreasing lumbar support.
Diagnostics
TestBook can only verify that the seat power relay line is enabled. It cannot determine the status of the system or any
of the components.

SUNROOF
76-6-18 REPAIRS
Motor - sunroof
$% 76.84.07
This procedure is applicable to the motor of both
sunroofs.
Remove
1.Gain access to the sunroof motor:
lFor front sunroof motor, remove front
stowage pocket.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Stowage pocket - front.
lFor rear sunroof motor, remove headlining.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Headlining.
CAUTION: The sunroof must be fully closed
before removing the sunroof motor.
2.Disconnect sunroof motor multiplug.
3.Remove 3 Torx screws securing motor to
sunroof tray.
4.Remove sunroof motor. Refit
1.Check sunroof motor timing notch (A) aligns
with edge of microswitch (B). If motor is out of
alignment, rotate counting wheel (C) to correct
position using an Allen key.
2.Ensure sunroof drive cables are in fully closed
position.
3.Fit motor to sunroof frame.
4.Fit Torx screws securing motor to sunroof tray
and tighten to 2 Nm (1.5 lbf.ft).
5.Connect sunroof motor multiplug.
6.Fit interior trim:
lFor front sunroof motor, fit front stowage
pocket.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Stowage pocket - front.
lFor rear sunroof motor, fit headlining.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Headlining.

CHASSIS AND BODY DIMENSIONS
BODY DIMENSIONS 77-1-5
BODY DIMENSIONS
Body Dimensions
The following dimensional information is shown to assist the technician in the diagnosis and repair of body panels.
The information is shown in two different forms. In the first part of the information X,Y and Z dimensions are shown
and in the second part actual point to point dimensions are shown.
The X,Y,Z dimensions are the planes used by Land Rover for the measurement of body panels. The whole bodyshell
lies within a parallel grid system. See following illustrations.
The 'X' plane is an imaginery vertical plane which measures distances along the length of the vehicle. The start point
for this plane is through the centre of the rear wheels.
The 'Y' plane is an imaginery plane through the centre of the vehicle and measures distances across the vehicle. As
a rule, body dimensions are symmetrical about the centre line.
The 'Z' plane is an imaginery horizontal plane which measures distances in height of the vehicle. The start point for
this plane is through the centre of the rear wheels.
M77 1757
-2400
(-94.488)X
-1800
(-70.866)
-1200-6000600
(-47.244)(-23.622)(23.622)XXXXX
1200
(47.244)Z
600
(23.622)Z
0
Z
M77 1756
0
Y
600(23.622)
Y
600(23.622)
Y

CHASSIS AND BODY DIMENSIONS
BODY DIMENSIONS 77-1-11
Internal information
I.D Description Length
A Distance between seat belt anchorage top fixing and
seat belt reel lower fixing1814.5 (71.437)
B Distance between seat belt anchorage lower fixings on
wheel arch inner1430.2 (56.307)
M77 1760
A
B

PANEL REPAIRS
77-2-6 REPLACEMENT PANELS
'D'-post assembly
1'D' post outer assembly
2'D' post closing assembly3Wheelarch rear outer assembly
4Bodyside inner rear assembly

PANEL REPAIRS
PROCEDURES 77-2-15
PROCEDURES
Panel replacement procedure
This procedure is designed to explain the basic panel
removal and replacement method. The main criterion
in removal and replacement of body panels is that
the original standard is maintained as far as possible.
While individual repairs will differ in detail, this
procedure has been devised placing emphasis on
ease of repair and the elimination of unnecessary
work.
Body panels are being increasingly manufactured in
high strength steels to meet design requirements for
safety and weight saving. As panels in high strength
steels cannot be visually identified, and as they are
more sensitive to excess heat than panels
manufactured from low carbon steel, it is advisable
that the following procedure be observed at all times.
Remove panel
1.Expose resistance spot welds. For those spot
welds which are not obviously visible, use a
rotary impregnated wire brush fitted to an air
drill, or alternatively a hand held wire brush.
NOTE: In wheel arch areas it may be necessary
to soften underbody coating, using a hot air
gun, prior to exposing spot welds.2.Cut out welds using a cobalt drill.
3.Alternatively, use a clamp-type spot weld
remover.

PANEL REPAIRS
REPAIRS 77-2-33
Front valance assembly - RH
Remove
1.Disconnect battery eath lead.
2.Remove front bulkhead assembly.

+ PANEL REPAIRS, REPAIRS, Front
bulkhead assembly.
3.Remove engine compartment fusebox and
related wiring.
4.Remove radiator expansion tank from
mountings and position aside.
5. Petrol models: Remove cruise control
actuator mounting bracket.
6. Diesel models: Remove EGR modulator
mounting bracket.
7. RHD models: Remove brake servo.

+ BRAKES, REPAIRS, Servo - brake.
8.Remove brake pipes from valance assembly.
9.Remove RH road wheel.
10.Remove RH front mud flap.
11.Remove insulation pad from engine bulkhead.
12.Remove windscreen side finisher.

+ EXTERIOR FITTINGS, REPAIRS,
Side finisher - windscreen.
Repair
1.Remove existing panel(s), prepare panel joint
faces and install new panel(s) in accordance
with Panel Replacement Procedure. Punch or
drill holes in new panel for plug welding as
shown.Refit
1.Fit windscreen side finisher.

+ EXTERIOR FITTINGS, REPAIRS,
Side finisher - windscreen.
2.Fit insulation pad to engine bulkhead.
3.Fit front mud flap.
4.Fit road wheel and tighten nuts to 140 Nm (103
lbf.ft).
5.Fit brake pipes to valance assembly.
6. RHD models: Fit brake servo.
7. Diesel models: Fit EGR modulator mounting
bracket.
8. Petrol models: Fit cruise control actuator
mounting bracket.
9.Fit radiator expansion tank.
10.Fit fusebox and secure wiring.
11.Fit front bulkhead assembly.

+ PANEL REPAIRS, REPAIRS, Front
bulkhead assembly.
12.Connect battery leads, negative lead last.
M77 1694A

PANEL REPAIRS
77-2-34 REPAIRS
Front valance assembly - LH
Remove
1.Disconnect both battery leads, negative lead
first.
2.Disconnect leads/multiplug from alternator.
3.Remove front bulkhead assembly.

+ PANEL REPAIRS, REPAIRS, Front
bulkhead assembly.
4.Remove ABS modulator unit.

+ BRAKES, REPAIRS, Modulator unit
- ABS.
5. LHD models: Remove brake servo.

+ BRAKES, REPAIRS, Servo - brake.
6.Remove brake pipes from valance assembly.
7.Remove PAS/ACE reservoir.
8. Models with A/C: Remove A/C pipes from
valance assembly.
9.Remove wiring harness from valance
assembly.
10.Remove LH front road wheel.
11.Remove LH front mud flap.
12.Remove insulation pad from engine bulkhead.
13.Remove windscreen side finisher.

+ EXTERIOR FITTINGS, REPAIRS,
Side finisher - windscreen.
Repair
1.Remove existing panel(s), prepare panel joint
faces and install new panel(s) in accordance
with Panel Replacement Procedure. Punch or
drill holes in new panel for plug welding as
shown.Refit
1.Fit windscreen side finisher.

+ EXTERIOR FITTINGS, REPAIRS,
Side finisher - windscreen.
2.Fit insulation pad to engine bulkhead.
3.Fit front mud flap.
4.Fit road wheel and tighten nuts to 140 Nm (103
lbf.ft).
5.Fit wiring harness to valance assembly.
6. Models with A/C: Fit A/C pipes to valance
assembly.
7.Fit PAS/ACE reservoir.
8.Fit brake pipes to valance assembly.
9. LHD models: Fit brake servo.

+ BRAKES, REPAIRS, Servo - brake.
10.Fit ABS modulator unit.

+ BRAKES, REPAIRS, Modulator unit
- ABS.
11.Fit front bulkhead assembly.

+ PANEL REPAIRS, REPAIRS, Front
bulkhead assembly.
12.Connect leads/multiplug to alternator.
13.Connect battery leads, negative lead last.
M77 1742

PANEL REPAIRS
REPAIRS 77-2-41
Refit
1.Fit side drip rail finisher.
2.Fit wiring to 'B/C' post and sill areas.
3.Fit front and rear door door aperture seal.
4.Position carpet and secure with fixings.
5.Fit tread plates to front and rear door apertures.
6.Fit head lining.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Headlining.
7.Fit rear seat.

+ SEATS, REPAIRS, Seat - rear.
8.Fit front seat belt.

+ RESTRAINT SYSTEMS, REPAIRS,
Seat belt - front.
9. LH side: Fit CD autochanger.

+ IN CAR ENTERTAINMENT,
REPAIRS, CD autochanger.
10. RH side: Fit power amplifier.

+ IN CAR ENTERTAINMENT,
REPAIRS, Amplifier - power.
11.Fit RH or LH front seat.

+ SEATS, REPAIRS, Seat - front.
12.Fit sill finisher.
13.Fit front door striker to B/C post, fit Torx bolts
and tighten to 26 Nm (19 lbf.ft).
14.Fit rear door.

+ DOORS, REPAIRS, Door - rear.
15.Connect leads/multiplug to alternator.
16.Connect battery leads, negative lead last.
Panel body side assembly
Remove
1.Disconnect both battery leads, negative lead
first.
2.Disconnect leads/multiplug from alternator.
3.Remove loadspace side trim casing.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Trim casing - side - loadspace.
4.Remove head lining rear trim finisher.
5.Remove rear head rests, if fitted.
6.Remove body side rear glass.

+ SCREENS, REPAIRS, Glass - body
side - rear.
7.Remove rear bumper assembly.

+ EXTERIOR FITTINGS, REPAIRS,
Bumper assembly - rear - up to 03MY.
8.Remove rear bumper finisher.
9.Remove rear wheel arch liner.

+ EXTERIOR FITTINGS, REPAIRS,
Liner - wheel arch - rear.
10.Remove mud flap.
11.Remove tread plate from rear door aperture.
12.Remove rear door aperture seal.
13.Remove rear door striker from 'D' post.
14.Remove 'D' post outer trim finisher.
15.Remove wheel arch trim finisher.
16.Remove side drip rail finisher.
17. RH side: Remove tail door.
18. LH side: Remove tail door striker and setting
block from 'E' post.
19.Remove tail door tread plate.
20.Remove loadspace carpet retainer.
21.Remove tail door aperture seal.
22.Remove tail lamp.

+ LIGHTING, REPAIRS, Lamp - tail.
23. RH side: Remove fuel filler flap.
24. RH side: Remove fuel filler tube.

+ FUEL DELIVERY SYSTEM - V8,
REPAIRS, Filler tube - fuel.
25.Remove aerial amplifier.
26.Remove relevant wiring from body side area.