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

							DESCRIPTION AND OPERATION
4.86RANGE ROVER
Glove Box Lamp
The BCU (C0662) monitors the condition of the glove box switch (C0227) by providing a feed 
on a RY wire. When the glove box is opened, the switch contacts close creating a path to 
earth on an N wire.
Automatic Mode
When the interior lamps are in automatic mode and any of the doors are opened, the BCU 
(C0662) provides a feed to all the interior lamps listed in the  Body Control Unit (BCU)  
section previously. Current flows across the lamps to earth on N wires. When all the doors 
are closed, the BCU withdraws the feed to the interior lamps.
Manual Mode
When the switch located on the front interior lamp is pressed to enter the manual 
continuously on mode, current flows across the front interior lamp to the BCU (C0660) on 
a WN wire. Sensing this, the BCU illuminates all the interior lamps listed in the  Body 
Control Unit (BCU)  section irrespective of door status. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.87
INTERIOR ILLUMINATION
DESCRIPTION
General
Operation of the interior illumination LEDs and lamps is controlled by the Light Check 
Module (LCM). The LCM is located at the base of the RH A post, and powers the LEDs and 
lamps when the ignition switch is in either the auxiliary or ignition position, and the lighting 
switch is in either the side or headlamp position.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 3, fusible link 4, 
and fuse 53 of the passenger compartment fuse box (C0632) on an R wire. Fusible link 3 
(C0589) and fusible link 4 (C0590) provide constant battery feeds to the LCM on R wires. 
Fuse (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 auxiliary 
position, current flows across the switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) to 
fuse 9 of the passenger compartment fuse box (C0585) on a PB wire. Fuse 9 (C0587) 
provides an auxiliary ignition feed to the LCM (C2040) on a PY 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 4 of the passenger compartment 
fuse box (C0585) on a G wire. Fuse 4 (C0587) provides an ignition feed to the LCM (C2040) 
on a GS wire.
Lighting Switch
The LCM (C2040) monitors the condition of the fascia mounted rotary lighting switch 
(C0041) by providing a feed on an NB wire. When the lighting switch is turned to the side 
lamp position, it returns a feed to the LCM (C2040) on a Y wire. When the lighting switch is 
turned to the headlamp position, it returns a feed to the LCM (C2040) on a B wire. 
						

							DESCRIPTION AND OPERATION
4.88RANGE ROVER
Light Check Module (LCM)
When the LCM (C2039) senses that the ignition switch is in either the auxiliary or ignition 
position, and the lighting switch is in either the side or headlamp position, it provides a feed 
to the following lamps on SR wires:

RH inner face level air vent illumination (C1295)

RH outer face level air vent illumination (C1200)

LH inner face level air vent illumination (C1294)

LH outer face level air vent illumination (C1199)

Clock illumination (C0232)

Rear heater illumination (C0846)

Sunroof switch illumination (C0363)

Automatic Temperature Control (ATC) control panel (C1629)

Emergency switch illumination (C2082)

Instrument pack illumination (C0230)

Hazard warning switch illumination (C0096)

Centre console switch pack illumination (C0700)

Radio remote display illumination (C0241)

Multi Function Display (MFD) illumination (C0816)

Radio/cassette player illumination (C0098)

Rear radio illumination (C0818)

LH rear window switch illumination (C0732)

RH rear window switch illumination (C0732)
NOTE: The LH and RH rear window switches have the same connector number as 
they utilise the same harness.

Air suspension ride height switch illumination (C2186)

Drivers door module illumination (C2058)

Passenger door module illumination (C2057)

Front cigar lighter (C0074)

Rear cigar lighter (C1596)

Ashtray illumination (C2322)

RH seat heat switch (C1401)

LH seat heat switch (C1403)

Automatic transmission selector indicator illumination (C0245)

Telephone eject box illumination (C1252). 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.89
All the above are earthed on N wires. The LCM also provides a feed to the following LEDs 
on SR wires:

Front interior lamp LEDs (C0355)

Rear interior lamp LED (C0357)

RH rear door handle LED (C2335)

LH rear door handle LED (C2335)
NOTE: The LH and RH rear door handle LEDs have the same connector number as 
they utilise the same harness.
All the above are earthed on N wires.
Drivers Door Module
When the drivers door module (C2058) receives an illumination feed from the LCM, it 
illuminates the following LEDs by providing a feed on SR then SU wires:

Drivers door interior handle LED

Door pocket front LED

Door pocket rear LED.
Passenger Door Module
When the passenger door module (C2057) receives an illumination feed from the LCM, it 
illuminates the following LEDs by providing a feed on SR then SU wires:

Passenger door interior handle LED

Door pocket front LED

Door pocket rear LED. 
						

							DESCRIPTION AND OPERATION
4.90RANGE ROVER
INSTRUMENTS
DESCRIPTION
General
The instrument pack is a totally electronic device which receives analogue or digital signals 
via hardwired or bus systems for instrumentation operation. The instrument pack has two 
main functions:

To provide the driver information on vehicle status

To process and relay digital signals to and from other system controlling ECUs.
The signals are processed by two microprocessors which transpose the data into analogue 
gauge indications or warning lamp illumination. For more details on instrument pack 
operation, refer to the  Instruments  section of the System Description and Operation 
Workshop Manual.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 27, fuse 46, 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 46 
(C0586) provides two constant battery feeds to the instrument pack (C0230 & C0233) on a 
pair of RY wires.
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 
auxiliary position, current flows across the switch (C0099 on Td6 vehicles, C0028 on V8 
vehicles) to fuse 45 of the passenger compartment fuse box (C0585) on a PB wire. Fuse 45 
(C0586) provides an auxiliary ignition feed to the instrument pack (C0233) on a PG 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 1 of the passenger compartment 
fuse box (C0585) on a G wire. Fuse 1 (C0587) provides two ignition feeds to the instrument 
pack (C0230 & C0233) on a pair of GU wires.
The instrument pack (C0230 & C0233) is earthed on NB wires. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.91
Analogue Instruments
Speedometer
The ABS ECU (C0506) provides the instrument pack (C0230) a pulsed signal on an SB wire. 
The instrument pack calculates the vehicle speed from this signal and broadcasts it to other 
systems via the CAN, I, and K buses.
Tachometer
The instrument pack (C0234) receives an engine speed signal from the Engine Control 
Module (ECM) via the CAN bus on YN (low) and YB (high) wires.
Fuel Level Gauge
The instrument pack (C0234) provides a feed to the LH fuel tank level sensor (C0114) and 
the RH fuel tank level sensor (C0114) on BRW and BRY wires respectively. Each level 
sensor is a float operated potentiometer. By measuring the current returned on an NBW (LH) 
and an NBY (RH) wire, the instrument pack can determine how much fuel is in the tank.
Engine Coolant Temperature (ECT) Gauge
The instrument pack (C0234) provides a feed to the ECT sensor (C0169) on an NP wire. 
The ECT sensor is a Negative Temperature Coefficient (NTC) sensor. As ECT rises, the 
resistance of the sensor falls. By measuring the signal returned on an NY wire, the 
instrument pack can determine the ECT.
Warning Lamps
For details on warning lamp operation, refer to the  Instruments  section of the Service 
Description and Operation Workshop manual. 
						

							DESCRIPTION AND OPERATION
4.92RANGE ROVER
HORNS
DESCRIPTION
General
Two horns are located behind the RH side of the front bumper. Operation of the horns is 
controlled by the two steering wheel mounted switches when the ignition switch is in either 
the auxiliary or ignition position. 
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 10 and fuse 53 of the 
passenger compartment fuse box (C0632) on an R wire. Fuse 10 is connected to the switch 
contacts of the horn relay, which is also located in the passenger compartment fuse box.
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 auxiliary position, current 
flows across the switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) to the horn relay 
coil (C0585) on a PB wire.
Horn Relay
The earth path for the horn relay coil (C0587) is controlled by the steering wheel modules 
(C2285) via the rotary coupler (C0082) on an NR wire. When either of the horn switches are 
pressed, an earth path is created via the rotary coupler (C0082) on an NB wire. This 
energises the horn relay (C0585) allowing fuse 10 of the passenger compartment fuse box 
to supply a battery feed to the LH (C0003) and RH (C0004) horns on a pair of PS wires. Both 
horns are earthed on N wires. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.93
CLOCK
DESCRIPTION
General
The analogue clock is mounted on the passenger side of the centre console, and is 
illuminated when the fascia mounted rotary lighting switch is turned to either the side or 
headlamp position.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 13 of the passenger 
compartment fuse box (C0632) on an R wire. Fuse 13 (C0586) provides a constant battery 
feed to the clock (C0232) on an RG wire. The clock (C0232) is earthed on an NB wire.
Illumination
When the Light Check Module (LCM) (C2039) senses that the ignition switch is in either the 
auxiliary or ignition position, and the lighting switch is in either the side or headlamp position, 
it provides a feed to the lamp contained within the clock assembly (C0232) on an SR wire. 
The lamp is earthed on an NB wire. 
						

							DESCRIPTION AND OPERATION
4.94RANGE ROVER
CIGAR LIGHTERS
DESCRIPTION
General
Two cigar lighters are fitted to Range Rover. The front cigar lighter is located in the front of 
the centre console for use by the driver and front passenger. The rear cigar lighter is located 
in the rear of the centre console for use by the rear seat passengers.
When the cigar lighter element is pushed into the cigar lighter, power is automatically 
switched through its locking clips to the heater coil. As current passes through the heater 
coil, the element will heat up to the point where the locking clips expand and release the 
cigar lighter element.
CAUTION: The cigar lighter should NOT be used for accessory power or damage may 
result.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 1 of the passenger 
compartment fuse box (C0632) on an R wire. Fusible link 1 (C0588) is connected to fuse 1 
of the rear fuse box (C2024) on an R wire.
Front Cigar Lighter
Fuse 1 of the rear fuse box (C2020) provides a constant battery feed to the front cigar lighter 
(C0089) on an RBY wire. When the cigar lighter element is pushed into the cigar lighter, an 
earth path is created (C0086) on an N wire. When the element reaches the correct 
temperature and is ejected, the circuit is broken.
Rear Cigar Lighter
Fuse 1 of the rear fuse box (C2020) provides a constant battery feed to the rear cigar lighter 
(C1594) on an RG wire. When the cigar lighter element is pushed into the cigar lighter, an 
earth path is created (C1595) on an N wire. When the element reaches the correct 
temperature and is ejected, the circuit is broken. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.95
ACCESSORY SOCKETS
DESCRIPTION
General
Two accessory sockets are fitted to Range Rover. The front accessory socket is located in 
the storage compartment at the rear of the centre console. The rear accessory socket is 
located on the RH side of the luggage compartment, behind a protective cover.
Both accessory sockets provide battery voltage to any approved Land Rover accessory.
CAUTION: The cigar lighter should NOT be used for accessory power or damage may 
result.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 1 (C0632) of the 
passenger compartment fuse box on an R wire. Fusible link 1 (C0588) is connected to fuse 
1 and fuse 7 of the rear fuse box (C2024) by an R wire.
Front Accessory Socket
Fuse 1 of the rear fuse box (C2020) provides a constant battery feed to the front accessory 
socket (C0350) on an RG wire. The front accessory socket (C0942) is earthed on an N wire.
Rear Accessory Socket
Fuse 7 of the rear fuse box (C2020) provides a constant battery feed to the rear accessory 
socket (C1632) on an RB wire. The rear accessory socket (C1632) is earthed on an N wire.