Land Rover Range Rover Electrical Library Lm 2nd Edition Rover Manual

							DESCRIPTION AND OPERATION
4.106RANGE ROVER
FUEL PUMP
DESCRIPTION
Td6
The fuel system on Td6 vehicles features three fuel pumps. A primary fuel pump is mounted 
in the plastic fuel tank. This pump supplies fuel to the secondary pump mounted externally 
to the tank. The secondary pump supplies fuel to the high pressure Fuel Injection Pump 
(FIP) mounted on the engine. For more information on the Td6 fuel system, refer to the  Fuel 
Delivery – Td6  section of the System Description and Operation Workshop manual.
V8
The fuel pump fitted on V8 vehicles is mounted in the plastic fuel tank, and supplies fuel at 
a constant 3.5 bar pressure to the fuel rail. The fuel rail distributes fuel evenly to each of the 
eight injectors. For more information on the V8 fuel system, refer to the  Fuel Delivery – V8  
section of the System Description and Operation Workshop manual.
OPERATION
Td6
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 5 of the passenger 
compartment fuse box (C0632) on an R wire. A constant battery feed is also supplied to the 
100A fuse located within the fuse holder (C1875) on an R wire. The 100A fuse (C1878) 
provides a constant battery feed to the Engine Control Module (ECM) relay (C1895) on an 
R wire.
Fusible link 5 of the passenger compartment fuse box (C0588) is connected to fuse 15 of 
the rear passenger compartment fuse box (C2024) by an R wire. Fuse 15 provides a 
constant battery feed to the fuel pump relay, which is also located in the rear fuse box.
ECM Relay
The 100A fuse located in the fuse holder (C1878) provides a constant battery feed to the 
ECM relay coil (C1895) on an R wire. The earth path for the relay coil (C1895) is controlled 
by the ECM (C0603) on an N wire. The energised ECM relay (C1895) provides a feed to 
fuse 51 of the passenger compartment fuse box (C0584) on an RW wire. Fuse 51 (C0585) 
supplies a feed to the fuel pump relay coil (C2022) on an RW wire.
Fuel Pump Relay
The fuel pump relay coil (C2022) receives a feed from fuse 51 of the passenger 
compartment fuse box (C0585) on an RW wire. The earth path for the relay coil (C2022) is 
controlled by the ECM (C0331) on a BP wire. The energised fuel pump relay provides a 
battery feed from fuse 15 of the rear fuse box to the primary (C0114) and secondary (C0205) 
fuel pumps on a pair of WU wires. Both pumps are earthed on N wires. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.107
V8
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 2 and fusible link 
5 of the passenger compartment fuse box (C0632) on an R wire. Fusible link 2 (C0591) 
provides a constant battery feed to the Engine Control Module (ECM) relay (C1895) on an 
R wire.
Fusible link 5 of the passenger compartment fuse box (C0588) is connected to fuse 15 of 
the rear passenger compartment fuse box (C2024) by an R wire. Fuse 15 provides a 
constant battery feed to the fuel pump relay, which is also located in the rear fuse box.
ECM Relay
Fusible link 2 of the passenger compartment fuse box (C0591) provides a constant battery 
feed to the ECM relay coil (C1895) on an R wire. The earth path for the relay coil (C1895) is 
controlled by the ECM (C0604) on an N wire. The energised ECM relay (C1895) provides a 
feed to fuse 51 of the passenger compartment fuse box (C0584) on an RW wire. Fuse 51 
(C0585) supplies a feed to the fuel pump relay coil (C2022) on an RW wire.
Fuel Pump Relay
The fuel pump relay coil (C2022) receives a feed from fuse 51 of the passenger 
compartment fuse box (C0585) on an RW wire. The earth path for the relay coil (C2022) is 
controlled by the ECM (C0331) on a BP wire. The energised fuel pump relay provides a 
battery feed from fuse 15 of the rear fuse box to the fuel pump (C0114) on a WU wire. The 
fuel pump is earthed on an N wire. 
						

							DESCRIPTION AND OPERATION
4.108RANGE ROVER
ROTARY COUPLER
DESCRIPTION
General
The rotary coupler is a rotating link harness, acting as a bridge between the electrical circuits 
contained within the steering wheel and the steering column. It relays signals for the 
following systems:

Horns

Audio system

Telephone

Cruise Control

Heated steering wheel

Driver airbag.
WARNING: Before carrying out any work on the rotary coupler, refer to the 
warning information contained within the Service Procedures Workshop 
Manual.
OPERATION
Horns
For detailed information on horn operation, refer to the  Horns  section of this manual.
 
+  HORNS. 
Audio System
For detailed information on audio system operation, refer to the  Entertainment and 
Information Systems  section of the System Description and Operation Workshop manual.
Telephone
For detailed information on telephone operation, refer to the  Entertainment and 
Information Systems  section of the System Description and Operation Workshop manual.
Cruise Control
For detailed information on cruise control operation, refer to the  Cruise Control  section of 
this manual.
 
+  CRUISE CONTROL. 
Heated Steering Wheel
For detailed information on heated steering wheel operation, refer to the   Steering Column  
section of this manual.
 
+  STEERING COLUMN.  
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.109
Driver Airbag
For detailed information on driver airbag operation, refer to the  Supplementary Restraint 
System (SRS)  section of this manual.
 
+  SUPPLEMENTARY RESTRAINT SYSTEM (SRS).  
						

							DESCRIPTION AND OPERATION
4.110RANGE ROVER
PARK DISTANCE CONTROL (PDC)
DESCRIPTION
General
Park Distance Control (PDC) provides an audible warning to the driver when any obstacles 
are in the path of the vehicle during forward and reverse parking manoeuvres. The system 
consists of four ultrasonic sensors in each bumper, an ECU, a sounder and a parking switch.
For detailed information on PDC, refer to the Driving Aids  section of the System 
Description and Operation Workshop Manual.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 27 and fuse 53 of the 
passenger compartment fuse box (C0632) on an R wire. Fuse 27 (C0582) provides a 
constant battery feed to the Body Control Unit (BCU) (C0662) on an RP wire.
Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0099 on Td6 
vehicles, C0028 on V8 vehicles) on an R wire. When the ignition switch is turned to the 
ignition position, current flows across the switch (C0099 on Td6 vehicles, C0028 on V8 
vehicles) to fuse 6 of the passenger compartment fuse box (C0585) on a G wire. Fuse 6 
(C0587) provides an ignition feed to the PDC ECU (C0957) on a GN wire. The PDC ECU 
(C0957) is earthed on an NB wire.
PDC Switch
The PDC ECU (C0957) monitors the condition of the PDC switch (C0700) by providing a 
feed on an NUY wire. When the switch is pressed, an earth path is created on an N wire. 
Sensing this, the PDC initiates the PDC system, and provides a feed to the switch tell-tale 
LED (C0700) on an NWY wire.
Rear PDC
RH Outer Sensor
The PDC ECU (C0958) provides a feed to the RH outer PDC sensor (C0966) on a GP wire. 
An earth path is provided for the sensor by the PDC ECU on an NY wire. The PDC sensor 
outputs a pulsed signal to the PDC ECU on a YN wire, which the PDC ECU translates into 
a distance reading. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.111
RH Inner Sensor
The PDC ECU (C0958) provides a feed to the RH inner PDC sensor (C0965) on a GS wire. 
An earth path is provided for the sensor by the PDC ECU on an NU wire. The PDC sensor 
outputs a pulsed signal to the PDC ECU on a YB wire, which the PDC ECU translates into 
a distance reading.
LH Inner Sensor
The PDC ECU (C0958) provides a feed to the LH inner PDC sensor (C0964) on a GN wire. 
An earth path is provided for the sensor by the PDC ECU on an NB wire. The PDC sensor 
outputs a pulsed signal to the PDC ECU on a YG wire, which the PDC ECU translates into 
a distance reading.
LH Outer Sensor
The PDC ECU (C0958) provides a feed to the LH outer PDC sensor (C0963) on a GB wire. 
An earth path is provided for the sensor by the PDC ECU on an NW wire. The PDC sensor 
outputs a pulsed signal to the PDC ECU on a YS wire, which the PDC ECU translates into 
a distance reading.
PDC Sounder
The PDC ECU coverts the signals received from the rear PDC sensors and outputs a pulsed 
signal to the PDC sounder. The PDC sounder (C0987) is located on the RH side of the 
luggage and is provided a positive signal on a UR wire, and a negative signal on a US wire.
Front PDC
RH Outer Sensor
The PDC ECU (C1457) provides a feed to the RH outer PDC sensor (C0403) on a GP wire. 
An earth path is provided for the sensor by the PDC ECU on an NY wire. The PDC sensor 
outputs a pulsed signal to the PDC ECU on a YN wire, which the PDC ECU translates into 
a distance reading.
RH Inner Sensor
The PDC ECU (C1457) provides a feed to the RH inner PDC sensor (C0401) on a GS wire. 
An earth path is provided for the sensor by the PDC ECU on an NU wire. The PDC sensor 
outputs a pulsed signal to the PDC ECU on a YB wire, which the PDC ECU translates into 
a distance reading.
LH Inner Sensor
The PDC ECU (C1457) provides a feed to the LH inner PDC sensor (C0400) on a GN wire. 
An earth path is provided for the sensor by the PDC ECU on an NB wire. The PDC sensor 
outputs a pulsed signal to the PDC ECU on a YG wire, which the PDC ECU translates into 
a distance reading. 
						

							DESCRIPTION AND OPERATION
4.112RANGE ROVER
LH Outer Sensor
The PDC ECU (C1457) provides a feed to the LH outer PDC sensor (C0402) on a GB wire. 
An earth path is provided for the sensor by the PDC ECU on an NW wire. The PDC sensor 
outputs a pulsed signal to the PDC ECU on a YS wire, which the PDC ECU translates into 
a distance reading.
PDC Sounder
The PDC ECU coverts the signals received from the front PDC sensors a feed to the front 
sounder (C0405) on a US wire. The PDC sounder is located behind the lower edge of the 
fascia, above the drivers footwell and is earthed (C0369) on an NB wire.
I Bus
The PDC ECU (C0957) receives the following information on the I-bus via the instrument 
pack (C0233) on a WSY wire:

Vehicle speed

Reverse gear selected

Trailer fitted. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.113
TYRE PRESSURE MONITORING (TPM)
DESCRIPTION
General
The Tyre Pressure Monitoring (TPM) system continuously monitors tyre pressures so long 
as vehicle battery power is available. If a low tyre pressure is detected, the system alerts the 
driver via the message centre when the ignition is on. The system monitors the tyre pressure 
of each road wheel and the full size spare wheel.
NOTE: The tyre pressure of a space saver spare wheel is not monitored.
For a detailed description of the TPM system, refer to the  Driving Aids  section of the 
System Description and Operation Workshop Manual.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 16 and fuse 53 of the 
passenger compartment fuse box (C0632) on an R wire. Fuse 16 (C0586) provides a 
constant battery feed to the TPM ECU (C1537) on an RNY wire. The TPM ECU (C1537) is 
located under the front passenger seat and is earthed on an NB wire.
Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0099 on Td6 
vehicles, C0028 on V8 vehicles) on an R wire. When the ignition switch is turned to the 
ignition position, current flows across the switch (C0099 on Td6 vehicles, C0028 on V8 
vehicles) to fuse 6 of the passenger compartment fuse box (C0585) on a G wire. Fuse 6 
(C0587) provides an ignition feed to the TPM ECU (C1537) on a GN wire.
TPM Antennae
An air pressure and temperature sensor is fitted to the rim of each road wheel and the full 
size spare wheel. The sensors transmit radio signals to the relevant antenna at a frequency 
of 433 MHz. The TPM ECU (C1537) is connected to the antennae as follows:

To the RH front TPM antenna (C2027) by a W and a U wire

To the LH front TPM antenna (C2026) by a W and a G wire

To the RH rear TPM antenna (C2029) by a W and a Y wire

To the LH rear TPM antenna (C2028) by a W and an R wire.
TPM Reset Switch
The TPM ECU (C1537) provides a feed to the TPM reset switch (C0700) on a UR wire. 
When the switch is pressed, a feed is returned to the TPM ECU (C1537) on a UN wire. When 
the TPM registers that the reset switch has been pressed, it takes the current tyre pressure 
readings as the nominal pressures. 
						

							DESCRIPTION AND OPERATION
4.114RANGE ROVER
STEERING COLUMN
DESCRIPTION
General
The steering column fitted to New Range Rover features fully electrical adjustment for tilt 
and reach. On vehicles fitted with memory seats, the steering wheel position is incorporated 
into the memory of the seat ECU. On certain models, a heater is fitted around the rim of the 
steering wheel.
For a detailed description of the steering column, refer to the  Steering  section of the 
System Description and Operation Workshop Manual.
OPERATION
Non-Memory Steering Column
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 23 of the passenger 
compartment fuse box (C0632) on an R wire. Fuse 23 (C0583) provides a constant battery 
feed to the steering column adjustment control unit (C1392) on an RN wire. The control unit 
(C1392) is earthed on an N wire.
Steering Column Switch
Movement of the steering column is controlled via the 4 way switch mounted on the LH side 
of the steering column. The control unit (C1392) is connected to the switch (C1393) as 
follows:

If forward movement is selected, an earth path is created via the switch on an NU wire

If backward movement is selected, an earth path is created via the switch on an NR 
wire

If upwards movement is selected, an earth path is created via the switch on an NB wire

If downwards movement is selected, an earth path is created via the switch on an NW 
wire.
The switch is earthed on an NB wire.
Tilt Movement
If tilt movement of the steering column is requested, the control unit (C1392) powers the 
height motor (C1397) via BU and UB wires.
Reach Movement
If reach movement of the steering column is requested, the control unit (C1392) powers the 
telescope motor (C1396) via B and U wires. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.115
Memory Steering Column
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to the seat relay and fuse 53 of 
the passenger compartment fuse box (C0632) on an R wire. Fuse 53 (C0583) provides a 
constant battery feed to the ignition switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) 
on an R wire. When the ignition switch is turned to the ignition position, current flows across 
the switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) to the seat relay (C0585) on a G 
wire. The seat relay is located in the passenger compartment fuse box and is earthed 
(C0585) on an N wire.
Steering Column Switch
Movement of the steering column is controlled via the 4 way switch mounted on the LH side 
of the steering column. The seat memory ECU (C0773) is connected to the switch (C1393) 
as follows:

If forward movement is selected, an earth path is created via the switch on an NU wire

If backward movement is selected, an earth path is created via the switch on an NR 
wire

If upwards movement is selected, an earth path is created via the switch on an NB wire

If downwards movement is selected, an earth path is created via the switch on an NW 
wire.
The switch is earthed on an NB wire.
Seat Memory ECU
The seat memory ECU (C0773) interprets the signals received from the steering column 
switch (C0773) and adjusts the steering column as follows:

If vertical adjustment is requested, the seat memory ECU provides a feed to the height 
motor (C1395) on a B wire

If height adjustment is requested, the seat memory ECU provides a feed to the 
telescope motor (C1394) on a BU wire.
Both motors are earthed on N wires.