1999 LAND ROVER DISCOVERY Workshop Manual

SEATS
76-5-12 DESCRIPTION AND OPERATION
Temperature control unit
The temperature control unit is only fitted to vehicles with electric seats. Feed back of the seat temperature is via a
Negative Temperature Coefficient (NTC) sensor within the seat cushion. Resistance of this sensor changes with the
temperature of the seat cushion allowing the temperature control unit to lower or raise the voltage to the seat heater
elements to raise or lower their temperature.
An ignition feed is supplied via the seat heater switch. The temperature sensor supplies an input. Output is a supply
to the cushion heater element and an earth.
Thermostat
On vehicles with non electric seats, the temperature is controlled by a thermostat located in the seat cushion. The
thermostat interrupts the power supply when it reaches a pre-determined temperature.

SEATS
DESCRIPTION AND OPERATION 76-5-13
Operation - heated seats
When the seat heater switch is operated, power is supplied to the heater elements in the seat, causing the seat to
heat up. On vehicles fitted with non electric seats, the thermostat switches the power supply to the heater elements
on and off. On vehicles fitted with electric seats, the temperature control unit senses seat temperature via the sensor
in the cushion and regulates voltage to the seat heater elements to maintain a constant temperature.
On both electric and non electric seats, the heater elements increase and then maintain the seat at a temperature
between 26 and 36 °C (79 and 97 °F).

SEATS
REPAIRS 76-5-15
REPAIRS
Seat - front
$% 78.10.43.99
Remove
1.Disconnect battery earth lead.
2.Remove 3 screws and 1 trim clip securing
lower trim casing to seat.
3.Remove lower trim casing.
4.Remove cap from front seat belt lower
anchorage bolt.
5.Remove front seat belt lower anchorage bolt. 6.Remove 4 Torx bolts and nut securing front
seat to floor.
7.Lean seat forward to gain access to multiplugs.

SEATS
76-5-16 REPAIRS
8.Release pretensioner multiplug from seat
frame and disconnect.
9. Electrically operated seats: Disconnect 2
seat motor multiplugs.
10.Remove front seat.
Refit
1.Fit front seat in vehicle.
2. Electrically operated seats: Connect seat
motor multiplugs.
3.Connect pretensioner multiplug and secure to
seat frame.
4.Fit Torx bolts and nut securing front seat to floor
and tighten to 45 Nm (33 lbf.ft).
5.Fit front seat belt lower anchorage bolt to front
seat and tighten to 32 Nm (24 lbf.ft).
6.Fit cap to lower anchorage bolt.
7.Fit lower trim casing to seat and secure with
screws and trim clip.
8.Connect battery earth lead.
Seat - third row
$% 78.10.45
Remove
1.Manufacture a spring retainer bracket to the
dimensions given above.
2.Position third row seat in deployed position.
3.Remove the cup holder (where applicable).

SEATS
REPAIRS 76-5-17
4.Remove saddle bracket cover from lower rear
quarter to allow access to third row seat
securing bolts and nuts.
5.Remove top 2 bolts securing seat to lower rear
quarter panel.
6.Position the locally manufactured retainer
bracket across the seat mounting. Ensure that
the lugs on the end of the retainer fit below the
seat mounting bar, then partially fold the seat
so that the retainer bracket is held in position.
7.Remove lower 2 nuts securing seat to lower
rear quarter panel. The action of the spring will
now hold the retainer bracket in place.
8.Remove seat.Refit
1.Ensuring that the retainer bracket is in position
on the spring, position third row seat to its
mounting studs.
2.Fit nuts securing third row seat to lower rear
quarter panel and tighten to 22 Nm (16 lbf.ft).
3.Remove the retainer bracket, fit bolts securing
third row seat to lower rear quarter panel and
tighten to 22 Nm (16 lbf.ft).
4.Fit saddle bracket cover to third row seat
securing bolts, fit the cup holder (where
applicable) and stow the seat.

SEATS
76-5-18 REPAIRS
Seat - rear
$% 78.10.48.99
This procedure is applicable to both rear seats.
Remove
1.Carefully pull carpet away from the rear seat
base to gain access to mounting brackets.
2.Remove 2 Torx bolts securing front of mounting
brackets to floor.
3.Fold rear seats fully forward.
4.Remove the 2 Torx bolts securing rear of
mounting brackets to floor.
5.Remove rear seat. Refit
1.Position rear seat to floor in the fully folded
position. Fit Torx screws to rear of mounting
brackets and tighten to 45 Nm (33 lbf.ft).
2.Position rear seat in upright position. Fit Torx
bolts to front of mounting brackets and tighten
to 45 Nm (33 lbf.ft).
3.Position front carpet.

SEATS
REPAIRS 76-5-19
Bolster assembly - rear armrest
$% 78.20.02
Remove
1.Raise rear seat centre headrest, release clips
securing headrest and remove.
2.Lower armrest and carefully release 2 upper
clips securing armrest bolster bars to seat
frame.
3.Release bolster bars from seat frame and raise
armrest to closed position.
4.Firmly grasp the armrest and bolster assembly,
using considerable force withdraw armrest
bolster assembly from seat frame pivots.
NOTE: During removal it is likely that one or
both armrest pivots will break.
5.Remove broken lower armrest pivots. NOTE:
Care must be used to ensure seat frame is not
distorted during pivot removal.Refit
1.Fit and secure new armrest bolster pivots to
seat frame.
2.Fit new armrest and bolster assembly to lower
pivots, align and push fully home to lock.
3.Position bolster armrest assembly vertically,
align bars, fit and secure bolster bars to upper
seat frame clips.
4.Check operation of armrest assembly.
5.Fit and secure rear seat centre headrest.