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

							DESCRIPTION AND OPERATION
4.6RANGE ROVER
Central Door Locking (CDL)
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to the following on an R wire:

Fusible link 1.

Fuse 11.

Fuse 15.

Fuse 24.

Fuse 60.
All are located in the passenger compartment fuse box (C0632). Fuse 15 (C0586) provides 
a constant battery feed to the BCU (C0660) on an RS wire. Fuse 60 (C0582) also provides 
a feed to the BCU (C0662) on an RW wire. The BCU (C0660) is earthed on an NB wire.
Fuse 24 (C0583) provides a constant battery feed to the passenger door module (C2016) 
on an RW wire. Fuse 11 (C0585) provides a constant battery feed to the drivers door module 
(C2017) on an RP wire.
Fusible link 1 (C0588) is connected to fuse 14 and fuse 16 of the rear fuse box (C2024) on 
an R wire. Fuse 14 (C2022) provides a constant battery feed to the RF receiver (C0674) on 
an RB wire. Fuse 16 provides a constant battery feed to relay 8, which is also located in the 
rear fuse box.
RF Receiver
The RF receiver (C0674) is located at the top of the upper tail door and is provided a 
constant battery feed from fuse 14 of the rear fuse box (C2022) on an RB wire. The RF 
receiver converts the radio frequency signals from the remote handset and converts them 
into a digital signals. The RF receiver (C0674) provides the digital signal to the BCU (C0660) 
on a WY wire. The BCU processes the signal from the RF receiver and carries out the 
appropriate function.
CDL Master Switch
The non-latching CDL master switch is mounted on the fascia, below the hazard warning 
switch. The BCU (C0661) monitors the condition of the switch (C0700) by providing a feed 
on an SN wire. When the switch is pressed, the switch contacts close and a momentary 
earth is created on an N wire. When the BCU registers this earth, it will lock all four doors, 
the tail door, and the fuel filler flap. Pressing the button a second time unlocks all four doors, 
the tail door and the fuel filler flap.
NOTE: Superlocking is not initiated when the CDL master switch is pressed. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.7
Drivers Door
The BCU controls operation of the drivers door lock via the drivers door module. The drivers 
door module (C2017) is provided a constant battery feed from fuse 11 of the passenger 
compartment fuse box (C0585) on an RP wire. The module (C2017) is earthed on an N wire.
The BCU (C0660) communicates with the drivers door module (C2058) via the P-bus on a 
UR wire. If the drivers door module (C2058) receives an unlock signal from the BCU, it 
provides a feed to the door lock motor (C1449) on a U wire. Current flows across the motor 
(C1449) and is provided an earth path via the drivers door module (C2058) on a B wire.
The drivers door can also be unlocked using the key. The drivers door module (C2058) 
monitors the condition of the door lock barrel switch (C1449) on a WB wire. When the door 
lock is moved to the unlock position, the switch contacts close and an earth path is created 
on an N wire. Sensing this, the drivers door module unlocks the drivers door.
If the drivers door module (C2058) receives a lock signal from the BCU, it provides a feed 
to the door lock motor (C1449) on a B wire. Current flows across the motor (C1449) and is 
provided an earth path via the drivers door module (C2058) on a U wire.
If the drivers door module (C2058) receives a superlock signal from the BCU, it provides a 
feed to the superlock motor (C1449) on a W wire. Current flows across the superlock motor 
(C1449) and is provided an earth path via the drivers door module (C2058) on a U wire.
The drivers door can also be locked using the key. The drivers door module (C2058) 
monitors the condition of the door lock barrel switch (C1449) on a UR wire. When the door 
lock is moved to the lock position, the switch contacts close and an earth path is created on 
an N wire. Sensing this, the drivers door module locks the drivers door.
Front Passenger Door
The BCU controls operation of the front passenger door lock via the passenger door module. 
The passenger door module (C2016) is provided a constant battery feed from fuse 24 of the 
passenger compartment fuse box (C0583) on an RW wire. The module (C2016) is earthed 
on an N wire.
The BCU (C0660) communicates with the passenger door module (C2057) via the P-bus on 
a UR wire. If the passenger door module (C2057) receives an unlock signal from the BCU, 
it provides a feed to the door lock motor (C1451) on a U wire. Current flows across the motor 
(C1451) and is provided an earth path via the drivers door module (C2057) on a B wire.
If the passenger door module (C2057) receives a lock signal from the BCU, it provides a 
feed to the door lock motor (C1451) on a B wire. Current flows across the motor (C1451) 
and is provided an earth path via the passenger door module (C2057) on a U wire.
If the passenger door module (C2057) receives a superlock signal from the BCU, it provides 
a feed to the superlock motor (C1451) on a W wire. Current flows across the superlock motor 
(C1451) and is provided an earth path via the drivers door module (C2057) on a U wire. 
						

							DESCRIPTION AND OPERATION
4.8RANGE ROVER
Rear Passenger Doors
When the BCU (C0662) receives an unlock signal from the RF receiver, it provides a feed 
to the RH and LH rear (C0442) door lock motors on a pair of U wires. Current flows across 
the motors (C0442) to earth path via the BCU (C0662) on a pair of B wires.
When the BCU (C0662) receives a lock signal from the RF receiver, it provides a feed to the 
RH and LH rear door lock motors (C0442) on a pair of B wires. Current flows across the 
motors (C0442) to earth via the BCU (C0662) on a pair of U wires.
When the BCU (C0662) receives a superlock signal from the RF receiver, it provides a feed 
to the RH and LH rear (C0442) superlock motors on a pair of W wires. Current flows across 
the superlock motors (C0442) to earth via the BCU (C0662) on a pair of U wires.
Tail Door
The non-latching tail door switch is located on the centre console, adjacent to the clock. 
When the switch is pressed a momentary earth path is created. Sensing this, the BCU 
(C0662) provides a feed to the upper tail door motor (C0383) on a YN wire. The motor 
(C0383) is earthed on an N wire.
Once the upper tail door has been opened, the lower tail door can be opened. This can be 
carried out by pressing the non-latching switch located on the upper edge of the lower tail 
door.
The BCU (C0660) monitors the condition of the switch (C0615) by providing a feed on a YB 
wire. When pressed, the switch contacts close and a momentary earth path is created via 
the rear fuse box. Sensing this, the BCU (C0661) provides a feed to relay 8 of the rear fuse 
box (C2022) on an NY wire. This feed energises relay 8.
The energised relay 8 (C2022) allows a feed from fuse 16 of the rear fuse box to power the 
RH lower (C2052) and LH lower (C0617) tail door motors on UW wires. Both motors are 
earthed on N wires.
Fuel Filler Flap
When the BCU (C0662) receives an unlock signal from the RF receiver, it provides a feed 
to the fuel filler flap release motor (C0690) on a U wire. On European vehicles, current flows 
across the motor (C0690) and is provided an earth path via the BCU (C0662) on a W wire. 
On NAS vehicles, current flows across the motor (C0690) and is provided an earth path via 
the BCU (C0662) on a B wire.
When the BCU (C0662) receives a lock signal from the RF receiver, it provides a feed to the 
fuel filler flap release motor (C0690) on a W wire (B wire on NAS vehicles). Current flows 
across the motor (C0690) and is provided an earth path via the BCU (C0662) on a U wire. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.9
ENGINE IMMOBILISATION
DESCRIPTION
General
The function of the engine immobilisation system is to prevent unauthorised starting of the 
vehicle. The system is controlled by an immobilisation ECU which is located beneath the 
centre console, adjacent to the handbrake. Re-mobilisation is achieved via a transponder in 
the vehicle key, which is read by a transponder coil when the ignition switch is turned to the 
auxiliary position. The transponder coil is mounted around the ignition switch.
For a detailed description of the engine immobilisation system, refer to the  Security  section 
of the Description and Operation Workshop Manual.
OPERATION
Td6
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 2, fuse 18, and fuse 
53 of the passenger compartment fuse box (C0632) on an R wire. Fuse 18 (C0584) provides 
a constant battery feed to the immobilisation ECU (C0059) and the steering column interlock 
ECU (C2055) on a pair of RY wires.
Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0099) on an R 
wire. When the ignition switch is turned to the auxiliary position, current flows across the 
switch (C0099) to fuse 39 of the passenger compartment fuse box (C0585) on a PB wire. 
Fuse 39 (C0587) provides an auxiliary ignition feed to the immobilisation ECU (C0059) and 
the steering column interlock ECU (C2055) on a pair of PB wires.
When the ignition switch is turned to the ignition position, current flows across the switch 
(C0099) to fuse 31 of the passenger compartment fuse box (C0585) on a G wire. Fuse 31 
(C0587) provides an ignition feed to the steering column interlock ECU (C2055) on a GB 
wire.
Fusible link 2 of the passenger compartment fuse box (C0591) provides a constant battery 
feed to the ignition switch (C0099) on an R wire. When the ignition switch is turned to the 
crank position, current flows across the switch (C0099) to the immobilisation ECU (C0059) 
on a BY wire. 
						

							DESCRIPTION AND OPERATION
4.10RANGE ROVER
Steering Column Interlock ECU
The steering column interlock ECU (C2055) receives the following power supplies:

A constant battery feed from fuse 18 of the passenger compartment fuse box (C0584) 
on an RY wire.

An auxiliary ignition feed from fuse 39 of the passenger compartment fuse box (C0587) 
on a PB wire.

An ignition on feed from fuse 31 of the passenger compartment fuse box (C0587) on 
a GB wire.
The ECU is earthed on an NB wire.
Transponder Coil
The transponder coil (C0049) is connected to the immobilisation ECU (C0059) by YU and 
YN wires. Both connections between the immobilisation ECU and the transponder coil 
switch between being both inputs and outputs. The transponder coil reads the vehicle 
identification information contained within the key transponder and relays it to the 
immobilisation ECU.
Immobilisation ECU
The immobilisation ECU (C0059) is located beneath the centre console, adjacent to the 
handbrake. It receives a constant battery feed from fuse 18 of the passenger compartment 
fuse box (C0584) on an RY wire, and an auxiliary ignition feed from fuse 39 of the passenger 
compartment fuse box (C0587) on a PB wire. 
If the immobilisation ECU (C0059) has received a valid signal from both the transponder coil 
(C0049) and the steering column interlock ECU (C2055) when the ignition switch is turned 
to the crank position, it transmits a rolling code to the Engine Control Module (ECM) 
(C0331) on a BP wire. The immobilisation ECU (C0059) also provides a feed to the starter 
motor relay (C0179) on a B wire.
For more information on operation of the starter motor, refer to the Starting and Charging 
– Td6  section of this manual.
 
+  STARTING AND CHARGING – Td6.  
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.11
V8
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to the following on an R wire: 

Fusible link 2.

Fuse 18.

Fuse 25.

Fuse 53.
All are located in the passenger compartment fuse box (C0632). 
Fusible link 2 (C0591) provides a constant battery feed to the immobilisation ECU (C0059) 
on an R wire. Fuse 18 (C0584) provides a constant battery feed to the immobilisation ECU 
(C0059) and the steering column interlock ECU (C2055) on a pair of RY wires.
Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0028) on an R 
wire. When the ignition switch is turned to the auxiliary position, current flows across the 
switch (C0028) to fuse 39 of the passenger compartment fuse box (C0585) on a PB wire. 
Fuse 39 (C0587) provides an auxiliary ignition feed to the immobilisation ECU (C0059) and 
the steering column interlock ECU (C2055) on a pair of PB wires.
When the ignition switch is turned to the ignition position, current flows across the switch 
(C0028) to fuse 31 of the passenger compartment fuse box (C0585) on a G wire. Fuse 31 
(C0587) provides an ignition feed to the steering column interlock ECU (C2055) on a GB 
wire.
Fuse 25 of the passenger compartment fuse box (C0583) provides a constant battery feed 
to the ignition switch (C0028) on an RU wire. When the ignition switch is turned to the crank 
position, current flows across the switch (C0028) to the Engine Control Module (ECM) 
(C0331) on a BY wire.
Steering Column Interlock ECU
The steering column interlock ECU (C2055) receives the following power supplies:

A constant battery feed from fuse 18 of the passenger compartment fuse box (C0584) 
on an RY wire.

An auxiliary ignition feed from fuse 39 of the passenger compartment fuse box (C0587) 
on a PB wire.

An ignition on feed from fuse 31 of the passenger compartment fuse box (C0587) on 
a GB wire.
The ECU is earthed on an NB wire. 
						

							DESCRIPTION AND OPERATION
4.12RANGE ROVER
Transponder Coil
The transponder coil (C0049) is connected to the immobilisation ECU (C0059) by YU and 
YN wires. Both connections between the immobilisation ECU and the transponder coil 
switch between being both inputs and outputs. The transponder coil reads the vehicle 
identification information contained within the key transponder and relays it to the 
immobilisation ECU.
Immobilisation ECU
The immobilisation ECU (C0059) is located beneath the centre console, adjacent to the 
handbrake. It receives a constant battery feed from fuse 18 of the passenger compartment 
fuse box (C0584) on an RY wire, and an auxiliary ignition feed from fuse 39 of the passenger 
compartment fuse box (C0587) on a PB wire. 
If the immobilisation ECU (C0059) has received a valid signal from both the transponder coil 
(C0049) and the steering column interlock ECU (C2055) when the ignition switch is turned 
to the crank position, it transmits a rolling code to the Engine Control Module (ECM) (C0331) 
on a BP wire. 
The immobilisation ECU (C0059) also provides a feed to the interlock relay (C1455) on a B 
wire. The energised interlock relay (C1455) provides a feed to the starter motor relay 
(C0179) on a B then BY wire.
For more information on operation of the starter motor, refer to the Starting and Charging 
– V8 section of this manual.
 
+  STARTING AND CHARGING – V8.  
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.13
WINDOWS
DESCRIPTION
General
Operation of all four windows is controlled by the Body Control Unit (BCU) via the P-bus. 
The P-bus allows communication between the BCU and the drivers and passenger door 
modules. The door modules are mounted in the relevant front door. The drivers door module 
features four rocker switches, and a non-latching switch to inhibit operation of the rear 
windows. A rocker switch is also located on the front passenger door, and both rear 
passenger doors for operation of the relevant window.
Both front and rear windows feature an anti-trap function. If an obstacle is detected while the 
window is being closed, it will return to the fully open position.
For a detailed description of window lift operation, refer to the  Windows  section of the 
Description and Operation Workshop Manual.
For a detailed description of the P-bus, refer to the  Communication Databuses  section of 
the Description and Operation Workshop Manual.
OPERATION
Front
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.
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.
Drivers Window
When the drivers door switch is moved to the Up position, the feed from fuse 11 of the 
passenger compartment fuse box (C0585) flows through the drivers door module (C2017) 
to earth on an N wire. The drivers door module (C2017) will now provide a feed to the 
window lift motor (C0740) on a BS wire. Current flows across the motor and back to the 
drivers door module (C2017) on a BG wire. The drivers door module provides an earth path 
for the motor on an N wire. When the current draw of the window lift motor increases, the 
BCU (via the P-bus) determines the window has reached the limit of its travel and cuts the 
supply from the drivers door module. 
						

							DESCRIPTION AND OPERATION
4.14RANGE ROVER
When the drivers door switch is moved to the Down position, the feed from fuse 11 of the 
front passenger compartment fuse box (C0585) flows through the drivers door module 
(C2017) to earth on an N wire. The drivers door module (C2017) will now provide a feed to 
the window lift motor (C0740) on a BG wire. Current flows across the motor and back to the 
drivers door module (C2017) on a BS wire. The drivers door module provides an earth path 
for the motor on an N wire. When the current draw of the window lift motor increases, the 
BCU (via the P-bus) determines the window has reached the limit of its travel and cuts the 
supply from the drivers door module.
Front Passenger Window
When the passenger door switch is moved to the Up position, the feed from fuse 24 of the 
passenger compartment fuse box (C0583) flows through the passenger door module 
(C2016) to earth on an N wire. The passenger door module (C2016) will now provide a feed 
to the window lift motor (C0741) on a BS wire. Current flows across the motor and back to 
the passenger door module (C2016) on a BG wire. The passenger door module provides an 
earth path for the motor on an N wire. When the current draw of the window lift motor 
increases, the BCU (via the P-bus) determines the window has reached the limit of its travel 
and cuts the supply from the passenger door module.
When the passenger door switch is moved to the Down position, the feed from fuse 24 of 
the front passenger compartment fuse box (C0583) flows through the passenger door 
module (C2016) to earth on an N wire. The passenger door module (C2016) will now provide 
a feed to the window lift motor (C0741) on a BG wire. Current flows across the motor and 
back to the passenger door module (C2016) on a BS wire. The passenger door module 
provides an earth path for the motor on an N wire. When the current draw of the window lift 
motor increases, the BCU (via the P-bus) determines the window has reached the limit of its 
travel and cuts the supply from the passenger door module.
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 kΩ. This resistance is 
constantly monitored by the BCU via the P-bus. 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 Ω. When the BCU detects this drop in resistance, it 
reverses the feed to the window lift motor. Both the drivers door module (C2058) and the 
passenger door module (C2057) are connected to the anti-trap seals (C0599 & C0600 
respectively) by NR wires. The anti-trap seals are both earthed on N wires. 
						

							DESCRIPTION AND OPERATION
RANGE ROVER 4.15
Rear
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 53 and fuse 60 of the 
passenger compartment fuse box (C0632) on an R wire. Fuse 60 (C0582) provides a 
constant battery feed to the BCU (C0662) 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 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 BCU (C0660) on a PW wire.
RH Rear Window
The BCU (C0660) provides a feed to the RH rear window switch (C0732) on SY then N and 
SU then SB wires. If the switch is moved to the Up position, the switch contacts close 
momentarily, allowing the feed on the SY then N wire to flow to earth on an N wire. Sensing 
this earth path, the BCU (C0662) provides a feed to the RH rear window lift motor (C0304) 
on a BN then BG wire. Current flows across the motor (C0304) and back to the BCU (C0662) 
on a US then UP wire. When the current draw of the window lift motor increases, the BCU 
determines the window has reached the limit of its travel and cuts the supply to the motor.
If the switch is moved to the Down position, the switch contacts close momentarily, allowing 
the feed on the SU then SB wire to flow to earth on an N wire. Sensing this earth path, the 
BCU (C0662) provides a feed to the RH rear window lift motor (C0304) on a UP then US 
wire. Current flows across the motor (C0304) and back to the BCU (C0662) on a BG then 
BN wire. When the current draw of the window lift motor increases, the BCU determines the 
window has reached the limit of its travel and cuts the supply to the motor.
LH Rear Window
The BCU (C0660) provides a feed to the LH rear window switch (C0732) on SN and SB 
wires. If the switch is moved to the Up position, the switch contacts close momentarily, 
allowing the feed on the SN wire to flow to earth on an N wire. Sensing this earth path, the 
BCU (C0662) provides a feed to the LH rear window lift motor (C0304) on a BG wire. Current 
flows across the motor (C0304) and back to the BCU (C0662) on a US wire. When the 
current draw of the window lift motor increases, the BCU determines the window has 
reached the limit of its travel and cuts the supply to the motor.
If the switch is moved to the Down position, the switch contacts close momentarily, allowing 
the feed on the SB wire to flow to earth on an N wire. Sensing this earth path, the BCU 
(C0662) provides a feed to the LH rear window lift motor (C0304) on a US wire. Current flows 
across the motor (C0304) and back to the BCU (C0662) on a BG wire. When the current 
draw of the window lift motor increases, the BCU determines the window has reached the 
limit of its travel and cuts the supply to the motor.