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

							DESCRIPTION AND OPERATION
4.116RANGE ROVER
Steering Wheel Heater
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to the steering wheel relay and 
fuse 53 of the passenger compartment fuse box (C0632) on an R wire. Fuse 53 (C0583) is 
connected to the ignition switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) by 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 steering wheel relay coil 
(C0585) on a G wire. The steering wheel relay coil (C0585) is earthed on an N wire.
Steering Wheel Heater
The energised steering wheel relay provides a feed to fuse 29. Fuse 29 (C0582) is 
connected to the rotary coupler (C0374) by a GB wire, allowing the rotary coupler to provide 
a feed to the heated steering wheel ECU (C1948) on an N wire. The steering wheel ECU is 
earthed via the rotary coupler on an R then N wire. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.117
AIR SUSPENSION
DESCRIPTION
General
The main function of the four wheel air suspension system is to maintain the vehicle at the 
correct ride height, irrespective of load. Additionally, the system allows the driver to request 
ride height changes to improve off-road performance or ease of access or for loading. The 
system automatically adjusts the ride height to improve the vehicle handling and dynamics 
when speed increases or decreases.
The air suspension system fitted to Range Rover is controlled by an ECU located behind the 
passenger side of the fascia. The ECU monitors the height of each corner of the vehicle via 
four height sensors, which are mounted in-board of each road wheel. The ECU also 
performs an on-board diagnostic function to perform health checks on the system. If faults 
are detected, codes are stored in the ECU and can be retrieved using TestBook or T4.
For a detailed description of the air suspension system, refer to the  Suspension  section 
of the System Description and Operation Workshop Manual.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 5 and fuse 57 of 
the passenger compartment fuse box (C0632) on an R wire. Fuse 57 (C0582) provides a 
constant battery feed to the air suspension ECU (C2030) on an RN wire. The air suspension 
ECU (C2030) is earthed on an N wire.
Fusible link 5 (C0588) is connected to fuse 18 of the rear fuse box (C2024) by an R wire. 
Fuse 18 provides a constant battery feed to the air suspension relay, which is also located 
in the rear fuse box. 
						

							DESCRIPTION AND OPERATION
4.118RANGE ROVER
Air Suspension ECU
The air suspension ECU (C0867) is located behind the LH side of the fascia, and is 
connected to the centre console rotary switch (C0700) as follows:

If the rotary switch is turned to select a lower suspension setting, an earth path is 
created via the switch on a UP wire

If the rotary switch is turned to select a higher suspension setting, an earth path is 
created via the switch on an SR wire

If the Hold switch has been selected, an earth path is created via the switch on a YW 
wire.
NOTE: The air suspension ECU will only allow the suspension settings to change if all the 
conditions described in the Suspension section of the System Description and Operation 
Workshop manual have been met.
The air suspension ECU (C0867) also provides a feed to the LEDs contained on the face of 
the centre console rotary switch (C0700) as follows:

To the Motorway LED on an SY wire

To the Off Road LED on an SG wire

To the Access LED on an SP wire

To the Standard LED on a WY wire

To the Hold LED on an SU wire.
Height Sensors
The Air Suspension ECU monitors the height of the vehicle via four height sensors. The air 
suspension ECU is connected to the height sensors as follows:
RH Front Height Sensor
The air suspension ECU (C0867) provides a feed to the RH front height sensor (C1697) on 
a BW wire. An earth path is provided for the sensor on a BN wire. By measuring the voltage 
returned on a BS wire, the air suspension ECU can determine the height of the RH front of 
the vehicle.
LH Front Height Sensor
The air suspension ECU (C0867) provides a feed to the LH front height sensor (C1696) on 
an SB wire. An earth path is provided for the sensor on an SN wire. By measuring the voltage 
returned on an SW wire, the air suspension ECU can determine the height of the LH front of 
the vehicle. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.119
RH Rear Height Sensor
The air suspension ECU (C0867) provides a feed to the RH rear height sensor (C1698) on 
a YB wire. An earth path is provided for the sensor on a YN wire. By measuring the voltage 
returned on a YS wire, the air suspension ECU can determine the height of the RH rear of 
the vehicle.
LH Rear Height Sensor
The air suspension ECU (C0867) provides a feed to the LH rear height sensor (C1699) on 
a WB wire. An earth path is provided for the sensor on a WN wire. By measuring the voltage 
returned on a WS wire, the air suspension ECU can determine the height of the LH rear of 
the vehicle.
Cross Link Valves
The cross link valves connect the height sensors in pairs, front and rear. When air is required 
to flow between the two rear height sensors, the air suspension ECU (C2030) provides a 
feed to the rear cross link valve (C2033) on a UR wire. The air suspension ECU provides an 
earth path for the cross link valve on a UP wire.
When air is required to flow between the two front height sensors, the air suspension ECU 
(C2030) provides a feed to the front cross link valve (C2032) on a UN wire. The air 
suspension ECU provides an earth path for the cross link valve on a WU wire.
Air Supply Unit
The air supply unit is located in a sealed housing in the spare wheel well. Located within the 
unit is the compressor. To power the compressor, the air suspension ECU (C0867) provides 
a feed to the air suspension relay coil (C2022) on a B wire. The relay is located in the rear 
fuse box and is earthed (C2021) on an N wire. The energised relay (C2023) provides a 
battery feed from fuse 18 of the rear fuse box to the compressor (C0873) on an RY wire. The 
compressor (C0873) is earthed on an N wire.
The air suspension ECU (C0867) monitors the temperature within the air supply unit 
(C0873) by providing a feed to the temperature sensor on a BRY wire. The air suspension 
ECU determines the temperature within the air supply unit by measuring the voltage 
returned on an S wire. 
						

							DESCRIPTION AND OPERATION
4.120RANGE ROVER
Valve Block
The valve block contains five solenoid valves which control the air supply as follows:
RH Front
If air is required in the RH front air spring, the air suspension ECU (C0867) provides a feed 
to the valve block (C0770) on a UB wire. An earth path is provided by the ECU on a UY wire.
LH Front
If air is required in the LH front air spring, the air suspension ECU (C0867) provides a feed 
to the valve block (C0770) on a UB wire. An earth path is provided by the ECU on a US wire.
RH Rear
If air is required in the RH rear air spring, the air suspension ECU (C0867) provides a feed 
to the valve block (C0274) on a WP wire. An earth path is provided by the ECU on a WR 
wire.
LH Rear
If air is required in the LH rear air spring, the air suspension ECU (C0867) provides a feed 
to the valve block (C0274) on a WP wire. An earth path is provided by the ECU on a YP wire.
Reservoir Valve
The reservoir valve controls the air pressure supply from the reservoir to the air springs. The 
air suspension ECU (C0867) provides a feed to the valve block (C0771) on a UW wire, and 
an earth path on a UG wire.
Air Pressure Sensor
The air pressure sensor measures the pressure within the air reservoir. The air suspension 
ECU (C0867) provides a feed to the pressure sensor (C1611) on a Y wire. An earth path is 
provided for the sensor on a W wire. By measuring the voltage returned on a U wire, the air 
suspension ECU can determine the pressure within the air reservoir. 
						

							CONNECTOR
RANGE ROVER 5.1
CONN ECTORCIRCUIT REFERENCE NUMBERS
CONNECTOR APPLICABILITY
General
The following table lists the circuit reference numbers against a description of the model or 
feature to which they apply.
This information should be used in conjunction with the connector pin-out tables on the 
following pages to determine the wire configuration of the vehicle being worked on.
Cct Model or Feature
1Td6
2V8 
3All
4ATC
5Comfort ATC
6 Park Distance Control
7 Cruise Control
8 Fuel Burning Heater
9 Heated Front Screen
10 Infra Red Remote Handset
11 RF Remote Handset
12 Low Line Interior Lamps
13 High Line Interior Lamps
14 Rain Sensor
15 Satellite Navigation
16 Seat Belt Warning
17 Electric Seats
18 Heated Front Seats
19 Heated Rear Seats
20 Rear Head Airbag
21 Headlamp Wash/Wipe
22 Xenon Lamps
23 Tyre Pressure Monitoring
24 Non-Memory Steering Column
25 Heated Steering Wheel
26 Electrochromic Rear View Mirrors
27 Low Line Audio System
28 High Line Audio System
29 Trailer Socket 
						

							CONNECTOR
5.2RANGE ROVER
30 Auxiliary Module (Europe)
31 Auxiliary Module (NAS) 
						

							CONNECTOR DETAILSC0001
RANGE ROVER
CONN ECTOR DE TAILS
RA NGE ROVE R
C0 001
Description:Lamp-Direction indicator/hazard warning-Front-LH
Location:Front of vehicle - LH side
Colour:BLACK
Gender:Female
P6853
C0001
C0538
CavColCct
1UGALL
2NALL 
						

							C0002CONNECTOR DETAILS
RANGE ROVER
C000 2
Description:Lamp-Direction indicator/hazard warning-Front-RH
Location:Front of vehicle - RH side
Colour:BLACK
Gender:Female
P6863
C0002
C0537
CavColCct
1UNALL
2NALL 
						

							CONNECTOR DETAILSC0003
RANGE ROVER
C0 003
Description:Horn (s)
Location:Behind RH side of front bumper
Colour:GREY
Gender:Female
P6868
C0004
C0003
CavColCct
1NALL
2PSALL