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

DESCRIPTION AND OPERATION
4.66RANGE ROVER
HEATED REAR WINDOW (HRW)
DESCRIPTION
General
Operation of the Heated Rear Window (HRW) is controlled by the Automatic Temperature 
Control (ATC) ECU via the non latching HRW switch. After 10 minutes of operation, (when 
ambient temperature is –15 °C (5 °F) or above) or 17 minutes (when ambient temperature 
is less than –15 °C (5 °F)), the ATC ECU operates the HRW at low power for 60 minutes. 
During the 60 minutes, the ATC ECU cycles the HRW relay off for 80...

DESCRIPTION AND OPERATION
RANGE ROVER 4.67
HEATED FRONT SCREEN (HFS)
DESCRIPTION
General
Operation of the Heated Front Screen (HFS) is controlled by the Automatic Temperature 
Control (ATC) ECU via the non latching HFS switch. 
When the engine is running and the HFS is selected, the ATC ECU illuminates the LED 
above the switch and energises the HFS relay attached to the passenger end of the fascia 
cross tube. If not already active, the ATC ECU also activates the A/C compressor and the 
blower, and sets...

DESCRIPTION AND OPERATION
4.68RANGE ROVER
WIPERS AND WASHERS
DESCRIPTION
General
The wipers and washers system is controlled by the Body Control Unit (BCU) on receipt of 
requests made by the driver or the rain sensor unit (if fitted). All wiper functions for the front 
and rear wipers are controlled from a multifunction wash/wipe switch assembly located on 
the right hand side of the steering column.
Optional equipment on Range Rover includes a rain sensor. The sensor, located below the 
interior rear...

DESCRIPTION AND OPERATION
RANGE ROVER 4.69
OPERATION
Front
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 26 and fuse 53 of the 
passenger compartment fuse box (C0632) on an R wire. Fuse 26 (C0583) provides a 
constant battery feed to the wiper delay ECU (C0546) on an RW 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 
auxiliary...

DESCRIPTION AND OPERATION
4.70RANGE ROVER
Rear
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 27, fuse 53, and fusible 
link 5 of the passenger compartment fuse box (C0632) on an R wire. Fuse 27 (C0585) 
provides a constant battery feed to the BCU (C0662) on an RU wire. Fusible link 5 (C0588) 
is connected to fuse 10 of the rear fuse box (C2024) on an R wire. Fuse 10 (C2021) provides 
a constant battery feed to the rear screen wiper ECU (C0388) on an RW wire.
Fuse...

DESCRIPTION AND OPERATION
RANGE ROVER 4.71
HEADLAMP WASH/WIPE
DESCRIPTION
General
Operation of the headlamp wash/wipe system is controlled by the Body Control Unit (BCU) 
via the headlamp wash/wipe relay. Headlamp wash/wipe is activated automatically when the 
ignition and the headlamps are switched on, and windscreen wash/wipe is selected via the 
column switch. The headlamp wipers will operate through four cycles, with the washer jets 
spraying twice. This operation is only carried out on the first...

DESCRIPTION AND OPERATION
4.72RANGE ROVER
BRAKE AND REVERSE LAMPS
DESCRIPTION
Brake Lamps
The brake lamps are active with the ignition switch in the auxiliary or ignition positions. The 
Light Check Module (LCM) receives an input from the brake switch, which is used as a signal 
to activate the brake lamps. When Hill Descent Control (HDC) is active, the ABS ECU 
outputs a signal on a separate hardwired connection to the LCM to activate the brake lamps 
when the HDC function is operating.
For more...

DESCRIPTION AND OPERATION
RANGE ROVER 4.73
Brake Lamps
The LCM (C2040) monitors the condition of the brake pedal via the brake pedal switch 
(C0075) on a UR wire. When the brake pedal is pressed, the switch contacts close and an 
earth path is created on an NB wire. Sensing this, the LCM (C0937) provides a feed to the 
following on BU wires:

The RH brake lamp (C0125)

The LH brake lamp (C0121)

The Centre High Mounted Stop Lamp (CHMSL) (C0613).
All are earthed on N wires.
When HDC is functioning, the...

DESCRIPTION AND OPERATION
4.74RANGE ROVER
HEAD, SIDE AND TAIL LAMPS
DESCRIPTION
General
Operation of the head, side, tail, and side marker (NAS vehicles only) is controlled by the 
Light Check Module (LCM). The LCM receives inputs from other systems via the I Bus.
Two headlamp systems are available; Halogen or bi-xenon. The two types of headlamps 
share a common lense.
NOTE: NAS vehicles are fitted with headlamp lenses marked with a Department of 
Transport (DOT) rating.
The bi-xenon headlamps illuminate...

DESCRIPTION AND OPERATION
RANGE ROVER 4.75
Light Check Module
The LCM (C2040) is located at the base of the RH A post, and monitors the condition of the 
fascia mounted rotary lighting switch (C0041) by providing a feed on an NB wire. The LCM 
can determine the position of the switch by sensing if a feed is returned on a Y (side lamps) 
or a B (headlamps) wire. The LCM also monitors the condition of the column mounted main/
dipped beam switch (C1832) via a U wire.
Side Lamps
If the LCM detects that side...