earth LAND ROVER DISCOVERY 2002 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
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).

SUNROOF
DESCRIPTION AND OPERATION 76-6-5
Description
General
The sunroof system consists of a front and a rear sunroof assembly. Both sunroof assemblies slide and tilt to open.
The sunroof system consists of the following components:
lSunroof ECU.
lBCU.
lFront sunroof switch.
lFront sunroof motor and microswitch.
lRear sunroof - front switch.
lRear sunroof - rear switch.
lRear sunroof isolation switch.
lRear sunroof motor and microswitch.
The BCU enables operation of the sunroof ECU. If the sunroof ECU does not receive an enable signal from the BCU,
neither sunroof assembly operates. The BCU is located behind the glovebox. The sunroof ECU is located above the
headlining next to the front sunroof assembly.
TestBook diagnoses the sunroof ECU.
Front sunroof switch
The front sunroof switch is located in the roof console above the windscreen in front of the front sunroof. It controls
the front sunroof motor via the sunroof ECU.
The front sunroof switch supplies an earth signal to the sunroof ECU. The pin at the ECU that receives the earth
signal determines whether ECU causes the sunroof to open or close.
TestBook cannot monitor the state of the front sunroof switch.
The following table lists the values which can be measured at the listed ECU pins when the conditions outlined are
met:
Signal values (connector connected)
Connector/Pin
No.Condition Resistance, ohms
C0784-2 Ignition in position II, front sunroof switch released > 10,000
C0784-2 Ignition in position II, front sunroof switch open < 0.5
C0785-7 Ignition in position II, front sunroof switch released > 10,000
C0785-7 Ignition in position II, front sunroof switch closed < 0.5

SUNROOF
76-6-6 DESCRIPTION AND OPERATION
Front sunroof motor and microswitch
The front sunroof motor is located within the front sunroof assembly. The sunroof ECU controls the front sunroof
motor.
The sunroof ECU determines the direction the sunroof motor runs. A battery signal to one side of the motor and an
earth to the other side of the motor causes the motor to turn in one direction, reversing the polarity through the same
pins causes the motor to turn in the opposite direction.
The following table lists the values which can be measured at the listed ECU pins when the conditions outlined are
met:
Signal values (connector connected)
Connector/Pin
No.Condition Voltage Resistance, ohms
C0785-5 Ignition in position II, rear of front sunroof switch
pressed+voltage to C0785-
5
C0785-1 Ignition in position II, front of front sunroof switch
pressed+voltage to C0785-
1< 0.5
C0784-8 Ignition in position II, sunroof fully closed +V Batt
C0784-8 Ignition in position II, sunroof not closed > 10,0000

SUNROOF
DESCRIPTION AND OPERATION 76-6-7
Rear sunroof - front switch
The rear sunroof front switch is located in the roof console above the windscreen in front of the front sunroof. It
controls the rear sunroof motor via the sunroof ECU.
The rear sunroof front switch supplies an earth signal to the sunroof ECU. The pin at the ECU that receives the earth
signal determines whether ECU causes the sunroof to open or close.
TestBook cannot monitor the state of the rear sunroof front switch.
The following table lists the values which can be measured at the listed ECU pins when the conditions outlined are
met:
Signal values (connector connected)
Connector/Pin
No.Condition Ohms
C0784-7 Ignition in position II, rear sunroof front switch released > 10,000
C0784-7 Ignition in position II, rear sunroof front switch open < 0.5
C0785-8 Ignition in position II, rear sunroof front switch released > 10,000
C0785-8 Ignition in position II, rear sunroof front switch closed < 0.5

SUNROOF
76-6-8 DESCRIPTION AND OPERATION
Rear sunroof isolation switch
The rear sunroof isolation switch is located in the roof console above the windscreen in front of the front sunroof. It
prevents the rear sunroof rear switch from operating the rear sunroof.
The rear sunroof isolation switch is in the earth path between the rear sunroof rear switch and the sunroof ECU.
Operating the rear sunroof isolation switch opens the circuit and prevents the rear sunroof rear switch from operating
the rear sunroof.
TestBook cannot monitor the state of the rear sunroof isolation switch.
The following table lists the values which can be measured at the listed ECU pins when the conditions outlined are
met:
Signal values (connector connected)
Connector/Pin
No.Condition Resistance, ohms
C0784-6 Ignition in position II, rear sunroof rear switch open, rear
sunroof isolation switch pressed> 10,000
C0784-6 Ignition in position II, rear sunroof rear switch open, rear
sunroof isolation switch released< 0.5
C0785-9 Ignition in position II, rear sunroof rear switch closed, rear
sunroof isolation switch pressed> 10,000
C0785-9 Ignition in position II, rear sunroof rear switch closed, rear
sunroof isolation switch released< 0.5

SUNROOF
DESCRIPTION AND OPERATION 76-6-9
Rear sunroof rear switch
The rear sunroof rear switch is located in the roof console in front of the rear sunroof. It controls the rear sunroof
motor via the sunroof ECU.
The rear sunroof front switch supplies an earth signal through the rear sunroof isolation switch to the sunroof ECU.
The pin at the ECU that receives the earth signal determines whether ECU causes the sunroof to open or close.
TestBook cannot monitor the state of the rear sunroof rear switch.
The following table lists the values which can be measured at the listed ECU pins when the conditions outlined are
met:
Signal values (connector connected)
Connector/Pin
No.Condition Resistance, ohms
C0784-6 Ignition in position II, rear sunroof isolation switch closed, rear
sunroof rear switch released> 10,000
C0784-6 Ignition in position II, rear sunroof isolation switch closed, rear
sunroof front switch open< 0.5
C0785-9 Ignition in position II, rear sunroof isolation switch closed, rear
sunroof front switch released> 10,000
C0785-9 Ignition in position II, rear sunroof isolation switch closed, rear
sunroof front switch closed< 0.5

SUNROOF
76-6-10 DESCRIPTION AND OPERATION
Rear sunroof motor and microswitch
The rear sunroof motor and microswitch are located within the rear sunroof assembly. The sunroof ECU controls the
rear sunroof motor.
The sunroof ECU determines the direction the sunroof motor runs. A battery signal to one side of the motor and an
earth to the other side of the motor causes the motor to turn in one direction, reversing the polarity through the same
pins causes the motor to turn in the opposite direction.
Operating Parameters (connector connected)
Connector/Pin
No.Condition Voltage Resistance, ohms
C0785-4 Ignition in position II, rear of rear sunroof switch pressed +voltage to C0785-
6
C0785-6 Ignition in position II, front of rear sunroof switch
pressed+voltage to C0785-
4< 0.5
C0784-2 Ignition in position II, sunroof fully closed +V Batt
C0784-2 Ignition in position II, sunroof not closed > 10,0000

SUNROOF
DESCRIPTION AND OPERATION 76-6-11
Sunroof ECU
The sunroof ECU is located behind the head lining above the rear view mirror. Most functions of the sunroof ECU are
covered under other components.
Sunroof ECU connector pin details - C0784
Sunroof ECU connector pin details - C0785
Pin No. Description Input/Output
1 Rear sunroof microswitch Input
2 Front sunroof switch - open Input
3 Not used -
4 Sunroof microswitches - common Input
5 Not used -
6 Rear sunroof, rear switch - open Input
7 Rear sunroof, front switch - open Input
8 Front sunroof microswitch Input
Pin No. Description Input/Output
1 Front sunroof motor forward Output
2 ECU earth Input
3 Battery power supply Input
4 Rear sunroof motor backwards Output
5 Front sunroof motor backwards Output
6 Rear sunroof motor forwards Output
7 Front sunroof switch - close Input
8 Rear sunroof, front switch - close Input
9 Rear sunroof, rear switch - close Input
10 Sunroof enable Input