Land Rover Discovery 99my To 03my Electrical Library 3rd Edition Rover Manual

DESCRIPTION AND OPERATION
4.30DISCOVERY SERIES II
Folding Mirrors Operation
When the switch is moved to the fold position, an earth path is completed on a UB wire from 
the ECU pin C0907-5 to the mirror switch. The earth continues through the switch contact 
and is connected on a B wire to earth header C0018.
The ECU supplies a feed to the RH folding mirror motor from pins C0907-1 or C0907-3 on 
O or OR wires to the motor. Depending on motor direction required to fold mirrors in or out, 
the earth from...

DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.31
ELECTRIC SEATS
DESCRIPTION
Adjustment
The electrically powered front seats are operated by four electric motors which control the 
seat base rear up/down, seat base front up/down, seat base forward/rearward and seat 
squab recline. The seats are operated by switches and controlled by the Body Control Unit 
(BCU). The seats operate when the ignition switch is in position I or II or for a predetermined 
period when the drivers door is open.
A electrically...

DESCRIPTION AND OPERATION
4.32DISCOVERY SERIES II
OPERATION
Circuit Supply
A feed from the battery positive terminal is connected on an R wire to the engine 
compartment fusebox where it passes through fusible links 1, 5, 7 and 8. Fusible links 1 and 
5 and 1 and 7 are connected in series.
A feed from fusible links 1 and 7 is connected to the contacts of the auxiliary circuits relay.
A feed from fusible links 1 and 5 is connected on an NG wire to connector C0255-5/C0751-
1 interface. From connector...

DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.33
From the RH seat heater switch the feed is connected on a UK wire to connector C0253-1/
C0751-1 interface. From connector C0751-1 the feed continues on an OW wire to the RH 
seat heat module.
Power is supplied to the electronics within the LH or RH seat heat module by the feed from 
the LH or RH seat heater switch. This allows the feed to pass through the module and is 
connected to the LH or RH seat cushion heater on a K wire. The LH or RH seat squab...

DESCRIPTION AND OPERATION
4.34DISCOVERY SERIES II
Lumbar Operation
When the lumbar inflate switch is operated, the feed from fuse 2 in the LH or RH satellite 
fuse block is connected from the LH or RH seat switch pack and connected to fuse 3 in the 
LH or RH satellite fuse block on a P wire. From fuse 3, the feed is connected to the LH or 
RH lumbar pump on a P wire.
When the lumbar deflate switch is operated, the feed from fuse 2 in the LH or RH satellite 
fuse block is connected from the LH or RH seat...

DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.35
MANUAL SEATS
DESCRIPTION
General
On vehicles with manual seats and seat heaters, the temperature is controlled by a 
thermostatic switch located in the seat cushion. The thermostat disconnects the power 
supply when the thermostat reaches 36 degrees C (97 degrees F) and restores the power 
supply when the temperature is below 26 degrees C (79 degrees F).
OPERATION
Circuit Supply
A feed from the battery positive terminal is connected on an R wire to the...

DESCRIPTION AND OPERATION
4.36DISCOVERY SERIES II
LH seat
From the LH seat heater switch the feed is connected on a US wire to connector interface 
C0255-1/C0751-1. From the interface the feed continues on an R wire to the LH seat 
cushion heater. The feed passes through the thermostatic switch and the cushion heater 
and is connected in series on a B wire to the LH seat squab heater. The seat squab heater 
is connected on a B wire to earth header C0708.
RH seat
From the RH seat heater switch the feed is...

DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.37
DIAGNOSTIC SOCKET
DESCRIPTION
General
The diagnostic socket is located below the facia on the drivers side. The connector is 
constructed to ISO standard and allows the attachment of TestBook/T4 or any other ISO 
standard scantool.
The diagnostic socket allows diagnostic information stored in any of the ECU’s listed below 
to be retrieved. It also allows engine tuning and fault diagnosis to be carried out.
OPERATION
Diagnostic Socket Supply
Circuit...

DESCRIPTION AND OPERATION
4.38DISCOVERY SERIES II
Self Levelling/Anti-Lock Brake System (SLABS) ECU
The SLABS ECU is connected to header C0286 on a K wire. The connection continues from 
the header C0286 to the diagnostic socket on a K wire.
Active Cornering Enhancement (ACE) ECU
The ACE ECU is connected to header C0286 on a K wire. The connection continues from 
the header C0286 to the diagnostic socket on a K wire.
Cruise control ECU - V8 engines only
The cruise control ECU is connected to header C0286...

DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.39
BODY CONTROL UNIT (BCU)
DESCRIPTION
General
The BCU communicates with and controls a large number of functions on the vehicle. Refer 
to BCU circuit diagram for BCU connection details.
For BCU power supplies refer to Power Distribution circuits.