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

							DESCRIPTION AND OPERATION
4.16RANGE ROVER
Anti-Trap
The anti-trap system consists of an anti-trap seal, which runs along the door glass frame. 
The seal contains two elements, with a combined resistance of 1.2 k. This resistance is 
constantly monitored by the BCU. If the window meets an obstacle, it pushes it against the 
anti-trap seal. This shorts the two elements together, reducing the seals resistance to 
approximately 500 . When the BCU detects this drop in resistance, it reverses the feed to 
the window lift motor. 
The BCU (C0661) is connected to the RH rear anti-trap seal (C2015) by an NR then NY wire, 
and to the LH rear anti-trap seal (C2015) by an NY wire. Both anti-trap seals (C2015) are 
earthed on N wires.
NOTE: Both rear anti-trap seals have the same connector number as they utilise the same 
harness. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.17
SUNROOF
DESCRIPTION
General
Operation of the sunroof is controlled via the three position switch located on the front of the 
headlining. Moving the switch rearwards opens the sunroof. Similarly, moving the switch 
forward closes the sunroof. A single press in the centre of the switch opens or closes the 
sunroof from the tilt position.
All switch inputs are registered by the sunroof ECU, which is located behind the front of the 
headlining, adjacent the sunroof motor. The sunroof ECU also receives messages from the 
Body Control Unit (BCU) via the P-Bus to enable it to carry out its automatic closing and 
opening routine. Automatic closing is carried out when the Land Rover button on the remote 
handset is pressed and held for longer than 2 seconds. Similarly, pressing and holding the 
Arrow key on the remote handset for longer than 2 seconds opens both the sunroof and all 
windows.
For more information on P-Bus messages, refer to the  Communication Databuses  
section of the System Description and Operation Workshop Manual.
For more information on Sunroof operation, refer to the  Sunroof  section of the System 
Description and Operation Workshop Manual.
For more information on automatic opening and closing, refer to the  Anti-theft Alarm and 
Central Door Locking  section of this manual.
 
+  ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL). 
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 53, and fuse 58 of the 
passenger compartment fuse box (C0632) on an R wire. Fuse 58 (C0582) provides a 
constant battery feed to the sunroof ECU (C0784) on an RS 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 position, current flows 
across the switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) to fuse 41 of the 
passenger compartment fuse box (C0585) on a PB wire. Fuse 41 (C0586) provides an 
auxiliary ignition feed to the Body Control Unit (BCU) (C0660) on a PW wire. 
						

							DESCRIPTION AND OPERATION
4.18RANGE ROVER
Sunroof ECU
The sunroof ECU (C0784) provides a feed to the sunroof switch (C0363) on a YS wire. If the 
switch is moved to the Open position, a feed is returned to the ECU (C0784) on a YG wire. 
The ECU will now power the sunroof motor to open the sunroof. By measuring the voltage 
pulses returned from two Hall effect sensors located within the sunroof mechanism, the ECU 
can determine when the sunroof has reached the end of its travel and cut the voltage supply 
to the motor.
If the switch is moved to the Close position, a feed is returned to the sunroof ECU (C0784) 
on an SB wire. The ECU will now power the sunroof motor to close the sunroof. By 
measuring the voltage pulses returned from the two Hall effect sensors, the ECU determines 
when the sunroof has reached the end of its travel and cuts the voltage supply to the motor.
If the centre of the switch is pressed, a feed is returned to the sunroof ECU (C0784) on a 
YW wire. The ECU will now power the sunroof motor in the Close direction to raise the rear 
of the sunroof. By measuring the voltage pulses returned from the two Hall effect sensors, 
the ECU determines when the sunroof has reached the end of its travel and cuts the voltage 
supply to the motor.
If the centre of the switch is pressed a second time, a feed is returned to the sunroof ECU 
(C0784) on a YW wire. The ECU will now power the sunroof motor in the Open direction to 
lower the sunroof. By measuring the voltage pulses returned from the two Hall effect 
sensors, the ECU determines when the sunroof has reached the end of its travel and cuts 
the voltage supply to the motor.
The sunroof ECU (C0784) is earthed on an N wire.
Body Control Unit (BCU)
The Body Control Unit (BCU) (C0660) communicates with the sunroof ECU (C0784) via the 
P-Bus. In addition to enabling automatic opening and closing to be carried out, the BCU also 
triggers the sunroof ECU into an energy saving sleep mode. 
For a detailed description of P-Bus operation and messages, refer to the  Communication 
Databuses  section of the System Description Operation Workshop Manual. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.19
DOOR MIRRORS
DESCRIPTION
General
The door mirrors operate when the ignition switch is turned to the auxiliary position. 
Operation of the door mirrors is carried out by door modules located in each front door, in 
conjunction with the Body Control Unit (BCU).
The BCU can store up to three mirror positions in its memory, which it transmits to the door 
modules via the peripheral (P) bus. The BCU also initiates mirror heating if the outside 
temperature is between  -10 °C and 35 °C.
If reverse gear is selected, the passenger door mirror will automatically lower to enable the 
driver to gain a better view of the kerb. When reverse gear is deselected, the mirror returns 
to its original position.
For a detailed description of door mirror operation, refer to the  Exterior Fittings – Door 
Mirrors  section of the Description and Operation Workshop Manual.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 11, fuse 24, and fuse 53 
of the passenger compartment fuse box (C0632) on an R wire. Fuse 11 (C0585) provides a 
constant battery feed to the drivers door module (C2017) on an RP wire. Fuse 24 (C0583) 
provides a constant battery feed to the passenger door module (C2016) on an RW wire. The 
drivers (C2017) and passenger (C2016) door modules are both earthed on N 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 41 of the passenger compartment fuse box (C0585) on a PB wire. Fuse 41 
(C0586) provides an auxiliary ignition feed to the Body Control Unit (BCU) (C0660) on a PW 
wire. The BCU (C0662) is earthed on an N wire. 
						

							DESCRIPTION AND OPERATION
4.20RANGE ROVER
Drivers Door Mirror
Horizontal Adjustment
When RH adjustment of the drivers door mirror is required, the drivers door module (C2271) 
provides a feed to the horizontal motor on a G wire. Current flows across the motor and back 
to the drivers door module (C2271) on an R wire. If LH adjustment of the drivers door mirror 
is required, the feed to the horizontal motor is reversed. The motor is provided a feed on an 
R wire, with an earth path provided by the drivers door module (C2271) via a G wire.
To prevent the vertical motor from operating, the drivers door module (C2271) also provides 
a feed to the vertical motor on an S wire. As the potential difference across the motor is 0V, 
the motor does not operate.
Vertical Adjustment
When upwards adjustment of the drivers door mirror is required, the drivers door module 
(C2271) provides a feed to the vertical motor on an S wire. Current flows across the motor 
and back to the drivers door module (C2271) on an R wire. If downwards adjustment of the 
drivers door mirror is required, the feed to the vertical motor is reversed. The motor is 
provided a feed on an R wire, with an earth path provided by the drivers door module 
(C2271) via an S wire.
To prevent the horizontal motor from operating, the drivers door module (C2271) also 
provides a feed to the horizontal motor on a G wire. As the potential difference across the 
motor is 0V, the motor does not operate.
Mirror Memory
The door mirror memory function works in conjunction with the seat and steering wheel 
memory functions. The BCU (C0660) receives a memory request from the seat memory 
ECU (C0862) via the K-bus on a WRY wire. The BCU (C0660) relays this message to the 
drivers door module (C2058) via the P-bus on a UR wire.
When the drivers door module receives a memory request it moves the mirrors as described 
above. Two potentiometers are fitted within the mirror assembly to determine its position. 
The drivers door module (C2271) provides a feed to both potentiometers on an O wire. The 
horizontal potentiometer is provided an earth path by the drivers door module (C2271) on a 
B wire. By measuring the current returned on a W wire, the drivers door module can 
determine the mirrors horizontal position.
The vertical potentiometer is also provided an earth path by the drivers door module (C2271) 
on a B wire. By measuring the current returned on a K wire, the drivers door module can 
determine the mirrors vertical position. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.21
Mirror Fold
A non-latching mirror folding switch is located on the drivers door module. When the switch 
is pressed a first time, the drivers door module (C2271) provides a feed to the mirror fold 
motor on an RU wire. Current flows across the motor and back to the drivers door module 
(C2271) on a GN wire. The drivers door mirror now moves to the folded position. If the switch 
is pressed a second time, the feed to the fold motor is reversed. The motor is provided a 
feed on a GN wire, with an earth path provided by the drivers door module (C2271) via an 
RU wire.
NOTE: Mirror fold is disabled if vehicle speed is greater than 10 km/h (6 mph).
The drivers door module (C2058) communicates the mirror fold request to the passenger 
door module (C2057) via the P-bus on a UR wire.
Mirror Heater
If the BCU (C0660) receives an outside temperature reading of between -10 °C and 35 °C, 
it informs the drivers door module (C2058) to initiate mirror heating via the P-bus on a UR 
wire. Pin 7 of the drivers door module (C2271) provides a feed to the door mirror heater on 
a B wire. An earth path is provided via pin 6 of the drivers door module (C2271), also on a 
B wire.
Passenger Door Mirror
Horizontal Adjustment
When RH adjustment of the passenger door mirror is required, the passenger door module 
(C2271) provides a feed to the horizontal motor on a G wire. Current flows across the motor 
and back to the passenger door module (C2271) on an R wire. If LH adjustment of the 
passenger door mirror is required, the feed to the horizontal motor is reversed. The motor is 
provided a feed on an R wire, with an earth path provided by the passenger door module 
(C2271) via a G wire.
To prevent the vertical motor from operating, the passenger door module (C2271) also 
provides a feed to the vertical motor on an S wire. As the potential difference across the 
motor is 0V, the motor does not operate.
Vertical Adjustment
When upwards adjustment of the passenger door mirror is required, the passenger door 
module (C2271) provides a feed to the vertical motor on an S wire. Current flows across the 
motor and back to the passenger door module (C2271) on an R wire. If downwards 
adjustment of the passenger door mirror is required, the feed to the vertical motor is 
reversed. The motor is provided a feed on an R wire, with an earth path provided by the 
passenger door module (C2271) via an S wire.
To prevent the horizontal motor from operating, the passenger door module (C2271) also 
provides a feed to the horizontal motor on a G wire. As the potential difference across the 
motor is 0V, the motor does not operate. 
						

							DESCRIPTION AND OPERATION
4.22RANGE ROVER
Mirror Memory
The door mirror memory function works in conjunction with the seat and steering wheel 
memory functions. The BCU (C0660) receives a memory request from the seat memory 
ECU (C0862) via the K-bus on a WRY wire. The BCU (C0660) relays this message to the 
passenger door module (C2057) via the P-bus on a UR wire.
When the passenger door module receives a memory request it moves the mirrors as 
described above. Two potentiometers are fitted within the mirror assembly to determine its 
position. The passenger door module (C2271) provides a feed to both potentiometers on an 
O wire. The horizontal potentiometer is provided an earth path by the passenger door 
module (C2271) on a B wire. By measuring the current returned on a W wire, the passenger 
door module can determine the mirrors horizontal position.
The vertical potentiometer is also provided an earth path by the passenger door module 
(C2271) on a B wire. By measuring the current returned on a K wire, the passenger door 
module can determine the mirrors vertical position.
Mirror Fold
When the passenger door module (C2057) receives a folding request from the drivers door 
module (C2058) via the P-bus, it provides a feed to the folding mirror motor on an RU wire. 
Current flows across the motor and back to the passenger door module (C2271) on a GN 
wire. The passenger door mirror now moves to the folded position. If the passenger door 
module receives a second fold request, the feed to the folding mirror is reversed. The motor 
is provided a feed on a GN wire, with an earth path provided by the passenger door module 
(C2271) via an RU wire.
NOTE: Mirror fold is disabled if vehicle speed is greater than 10 km/h (6 mph).
Mirror Heater
If the BCU (C0660) receives an outside temperature reading of between -10 °C and 35 °C, 
it informs the passenger door module (C2057) to initiate mirror heating via the P-bus on a 
UR wire. Pin 7 of the drivers door module (C2271) provides a feed to the door mirror heater 
on a B wire. An earth path is provided via pin 6 of the drivers door module (C2271), also on 
a B wire.
NOTE: The driver and passenger door modules have the same connector numbers as they 
utilise the same harness.
Door Mirror Memory
Door mirror memory information is stored in the driver and passenger door modules. When 
the memory function is selected, the BCU (C0660) informs the driver (C2058) and 
passenger (C2057) door modules to move the mirrors to the required position via the P-bus 
on a UR wire.  
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.23
INTERIOR MIRROR
DESCRIPTION
General
New Range Rover is fitted with an automatically dimming electrochromic interior mirror. A 
light sensor, incorporated into the interior mirror, dims the mirror if it detects a light source 
behind the vehicle. The interior mirror also provides an output to both door mirrors, allowing 
dimming of all three rear view mirrors.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 43 and fuse 53 of the 
passenger compartment fuse box (C0632) on an R wire. Fuse 43 (C0586) provides a 
constant battery feed to the interior mirror (C0698) on an RY 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 auxiliary ignition feed to the interior mirror (C0698) on a GW wire. The 
interior mirror (C0698) is earthed on an NB wire.
Automatic Dimming
When the light sensor incorporated in the interior mirror detects a light source from behind 
the vehicle, it automatically dims the interior mirror. When this happens, the interior mirror 
will also dim both the drivers and passenger door mirrors.
Drivers Door Mirror
The interior mirror (C0698) provides an output to the drivers door mirror (C2292) on WR then 
P and WU then B wires. When the drivers door mirror receives these feeds, it automatically 
dims. When the light source is removed from behind the vehicle, the feeds are removed and 
the drivers door mirror returns to normal brightness.
Passenger Door Mirror
The interior mirror (C0698) provides an output to the passenger door mirror (C2292) on WG 
then P and WY then B wires. When the passenger door mirror receives these feeds, it 
automatically dims. When the light source is removed from behind the vehicle, the feeds are 
removed and the passenger door mirror returns to normal brightness.
NOTE: The drivers and passenger door mirrors have the same connector number as they 
utilise the same harness. 
						

							DESCRIPTION AND OPERATION
4.24RANGE ROVER
Reverse Gear Inhibit
The automatic dimming function of the electrochromic interior mirror is inhibited if reverse 
gear is selected. The Light Check Module (LCM) (C2040) provides a reverse gear selected 
signal to the interior mirror (C0698) on a UY wire.
Anti-theft Alarm LED
The anti-theft alarm LED is located on the interior mirror (C0698) and receives a signal from 
the BCU (C0661) on an SBY wire. For more information on anti-theft alarm operation, refer 
to the  Anti-theft Alarm and Central Door Locking (CDL)  section of this manual.
 
+  ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).  
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.25
FRONT SEATS
DESCRIPTION
General
Two levels of electric front seats are fitted to Range Rover, with a memory function available 
as an option. The memory function is capable of storing up to three seat positions. The 
standard electric front seats have four motors to control the following:

Horizontal movement

Seat height

Seat angle

Seat backrest recline.
The higher specification Contour seat has two additional motors which control the following:

Headrest movement

Additional upper backrest adjustment.
For a detailed description of front seat operation, refer to the  Body – Seats  section of the 
System Description and Operation Workshop manual.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is provided to the seat relay and fuse 53. 
Both are located in the passenger compartment fuse box (C0632). 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 coil (C0585) on a G wire. 
Current flows through the seat relay coil (C0583) to earth on an N wire. This energises the 
seat relay. The energised seat relay provides a feed to fuse 20 and fuse 21, which are also 
located in the passenger compartment fuse box.  
Non-Memory Drivers Seat
Fuse 20 (C0584) provides a feed to the LH seat switch pack (C0773) on an RN wire. Fuse 
21 (C0584) provides a feed to the RH seat switch pack (C0774) on an RN wire. Both the LH 
(C0773) and the RH (C0774) seat switch packs are earthed on N wires.
Memory Drivers Seat
Fuse 20 (C0584) provides a feed to the seat memory ECU (C0722) on an RN wire, and the 
upper backrest motor (C2308) on an RN then R wire. The seat memory ECU (C0722) is 
earthed on an N and an NB wire. The upper backrest motor (C2308) is earthed on an N wire.
NOTE: The upper backrest motor is only fitted on the Comfort seat.