Land Rover Freelander 2003my Electrical Library Rover Manual

							DESCRIPTION AND OPERATION
4.46FREELANDER 03MY
Starter Motor and Starter Motor Solenoid
The starter motor solenoid coil (C0179) receives a feed from the energised starter relay 
(C0572) on an NR wire (see above). The energised starter motor solenoid allows a battery 
feed (C0178) to flow across the switch contacts and power the starter motor. 
Central Control Unit (CCU)
The CCU (C0428) receives a feed from the inertia switch (C0123) via the engine 
compartment fuse box (C0576) on a UG wire. If this feed is removed due to the inertia switch 
being tripped, the CCU will unlock all of the doors. For more details of the Central Door 
Locking (CDL) system, refer to the  Anti-theft Alarm and Central Door Locking (CDL)  
section of this manual.
 
+  ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL). 
NOTE: The CCU will only unlock all doors if the ignition switch is in the ignition position.
The CCU (C0429) also provides a signal feed to the immobilisation ECU (C0059) on a KN 
wire. This signal feed informs the immobilisation ECU to energise the starter relay. For a 
detailed description of the immobilisation ECU, refer to the  Engine Immobilisation  section 
of this manual.
 
+  ENGINE IMMOBILISATION. 
Charging
Alternator
Fusible link 1 of the engine compartment fuse box (C0826) provides a constant battery feed 
to the alternator (C0183) on an R wire. Fuse 19 of the passenger compartment fuse box 
(C0581) provides an ignition feed to the alternator (C0053) on a W wire. 
When the engine is turned over, the alternator (C0053) supplies the ECM (C0331) with a 
Pulse Width Modulated (PWM) signal on a GK wire. The ECM uses this PWM signal to 
calculate the electrical load on the alternator, and controls engine idle speed accordingly.
When the engine is started, the magnetised rotor within the stator windings generate 3 
phase alternating current (ac) and voltage that rises rapidly with rotor speed. The field 
diodes in the rectifier pack convert the ac current into direct current (dc). Output current from 
the field diodes supplements the initial current flowing through the field windings. This 
causes an increase in the magnetic influence of the rotor, resulting in self-exitation of the 
alternator. The field current increases with rotor speed and thus increases the generated 
current and voltage until the alternator is fully excited.
The alternator (C0183) charges the battery by providing current via fusible link 1 of the 
engine compartment fuse box (C0826 & C0632) to the battery positive terminal (C0192) on 
an R wire. 
						

							DESCRIPTION AND OPERATION
FREELANDER 03MY 4.47
Ignition/No Charge Warning Lamp
Fuse 8 of the passenger compartment fuse box (C0589) provides an ignition feed to the 
ignition/no charge warning lamp (C0233) on a G wire. Current flows across the lamp 
(C0233) and is provided an earth path by the alternator (C0053) on an NY wire. The warning 
lamp will now illuminate.
When the alternator is charging, it provides a feed to the warning lamp (C0233) on the NY 
wire. Because the potential difference across the bulb is 0 V, the lamp will now extinguish. 
						

							DESCRIPTION AND OPERATION
4.48FREELANDER 03MY
CRUISE CONTROL – TD4 & KV6 (NORTH AMERICA)
DESCRIPTION
General
Cruise control is switched on by pressing the cruise control master switch mounted on the 
centre console. The Set + and Res switches mounted on the steering wheel allow the 
driver to either set the vehicle speed as required or resume the last cruising speed set.
The cruise control system uses mechanical, electrical and vacuum operated devices to 
maintain vehicle speed at a setting selected by the driver. As vehicle speed changes due to 
changes in road gradients, so the cruise control ECU operates the cruise control pump, 
continually moving the cruise control actuator to maintain the set vehicle speed.
Should the driver wish to increase the speed of the vehicle, the Set + switch should be 
pressed and held. The vehicle will accelerate until the switch is released. As the Set + 
switch is released, the cruise control ECU will store the new cruise speed in its memory.
With cruise control switched on, it is possible to press the accelerator pedal and accelerate 
through the memorised set speed. When the accelerator is released, the cruise control ECU 
will automatically return the vehicle to its set speed. 
Note: The cruise control system will only operate between speeds of 22 mph (35 kph) and 
125 mph (201 kph).
Cruise control operation can be suspended by one of the following ways:
zBy pressing the Res switch.
zBy pressing the brake pedal.
zThe gearbox is placed in park, neutral, or reverse.
zHill Descent Control (HDC) is active.
zEngine revs are too high.
Under all these conditions, the cruise control set speed will be memorised. Cruise control 
operation can be resumed by pressing the Res switch.
Cruise control operation can be cancelled in one of two ways:
zBy pressing the cruise control master switch located on the centre console.
zBy switching the ignition off.
In both these cases, the cruise control set speed will be lost.
Warning: Do not switch off the vehicle ignition unless the vehicle is stationary and 
the handbrake is applied. 
						

							DESCRIPTION AND OPERATION
FREELANDER 03MY 4.49
OPERATION
General
Feed from the positive battery terminal (C0192) is supplied to the main relay, the horn relay, 
and fusible link 3 (C0632) on an R wire. All are located in the engine compartment fuse box. 
The earth path for the main relay (C0578) is controlled by the ECM (C0604) on an NG wire. 
The energised main relay provides a feed to fuse 4, which is also located in the engine 
compartment fuse box. For more information on main relay operation, refer to the  Engine 
Management System – EDC  or  Engine Management System – Siemens (NAS)  section 
of the System Description and Operation Workshop manual.
Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the 
ignition switch is turned to the ignition position, current flows across the switch (C0028) to 
fuse 35 of the passenger compartment fuse box (C0588) on a G wire.
Cruise Control Master Switch
Cruise control is switched on and off by pressing the master switch mounted on the centre 
console. Fuse 35 of the passenger compartment fuse box (C0580) supplies the cruise 
control master switch (C0749) an ignition feed on a W wire. When the switch is pressed, 
current flows across the switch contacts (C0749) to the cruise control interface unit (C1959) 
on a WY wire.
NOTE: When the cruise control system is switched off using the master switch, any stored 
road speed values will be lost.
Cruise Control Interface Unit
Fuse 4 of the engine compartment fuse box (C0575) provides a feed to the cruise control 
interface unit (C1959) on an NK wire. The interface unit (C1959) is earthed on a B wire. To 
enable it to control the cruise control system, the ECU receives a number of inputs from 
various sources as follows:
ABS ECU
The ABS ECU (C0501) provides a road speed signal to the cruise control interface unit 
(C1959) via the CAN-BUS on YN (Low) and YB (High) wires. For more information on the 
CAN-BUS road speed signal, refer to the  Communication Databuses  section of the 
System Description and Operation Workshop manual. 
						

							DESCRIPTION AND OPERATION
4.50FREELANDER 03MY
Set + Switch
A constant battery feed is supplied to the rotary coupler (C0082) via the horn relay (C0576) 
on a PY wire. Current flows across the rotary coupler (C1254) to the cruise control switches. 
The Set + switch is a normally open, non-latching switch. When the switch is pulled forward, 
the switch contacts close. Current flows across the switch back to the rotary coupler. The 
rotary coupler (C0082) is connected to the cruise control interface unit (C1959) by an RW 
wire. 
The interface unit (C1959) converts the signals received from the Set + switch, and relays 
information to the Engine Control Module (ECM) (C0331) on an RG wire. The signal 
provided by the interface unit is a continuous, pulsed voltage, varying from approximately 6 
V to 8 V. By measuring the frequency of the pulses, the ECM is able to control vehicle speed 
in accordance to requests from the Set + switch.
Res switch
A constant battery feed is supplied to the rotary coupler (C0082) via the horn relay (C0576) 
on a PY wire. Current flows across the rotary coupler (C1254) to the cruise control switches. 
The Res switch is a normally open, non-latching switch. When the switch is pulled forward, 
the switch contacts close. Current flows across the switch back to the rotary coupler. The 
rotary coupler (C0082) is connected to the cruise control interface unit (C1959) by a UW 
wire. 
The interface unit (C1959) converts the signals received from the Res switch, and relays 
information to the ECM (C0331) on an RG wire. The signal provided by the interface unit is 
a continuous, pulsed voltage, varying from approximately 6 V to 8 V. By measuring the 
frequency of the pulses, the ECM is able to control vehicle speed in accordance to requests 
from the Res switch.
Brake Pedal Switch
Fuse 35 of the passenger compartment fuse box (C0580) provides an ignition feed to the 
hall effect brake pedal switch (C0652) on a W wire. The brake pedal switch (C0652) is 
earthed on a B wire.
When the brake pedal is in the rest position, only a nominal voltage (between approximately 
0V and 2V) is supplied to the ECM (C0331) on GR and PG wires. When the brake pedal is 
pressed, this voltage rises to between approximately 6V and battery voltage. Sensing this 
increase, the ECM suspends cruise control operation. 
						

							DESCRIPTION AND OPERATION
FREELANDER 03MY 4.51
Electronic Automatic Transmission (EAT) ECU
When cruise control is active, the cruise control interface unit (C1959) provides a feed to the 
EAT ECU (C0932) on a WU wire. When the EAT ECU receives this feed, it enters its cruise 
control mode. For more information on EAT operation, refer to the   Electronic Automatic 
Transmission (EAT)  section of this manual.
 
+  ELECTRONIC AUTOMATIC TRANSMISSION (EAT). 
Instrument Pack
When cruise control is operational, the cruise control interface unit (C1959) sends a cruise 
active message to the instrument pack (C0230) via the CAN-BUS on YN (low) and YB (high) 
wires. This message is used to illuminate the cruise control lamp housed within the 
instrument pack. 
						

							DESCRIPTION AND OPERATION
4.52FREELANDER 03MY
CRUISE CONTROL – KV6
DESCRIPTION
General
Cruise control is switched on by pressing the cruise control master switch mounted on the 
centre console. The Set + and Res switches mounted on the steering wheel allow the 
driver to either set the vehicle speed as required or resume the last cruising speed set.
The cruise control system uses mechanical, electrical and vacuum operated devices to 
maintain vehicle speed at a setting selected by the driver. As vehicle speed changes due to 
changes in road gradients, so the cruise control ECU operates the cruise control pump, 
continually moving the cruise control actuator to maintain the set vehicle speed.
Should the driver wish to increase the speed of the vehicle, the Set + switch should be 
pressed and held. The vehicle will accelerate until the switch is released. As the Set + 
switch is released, the cruise control ECU will store the new cruise speed in its memory.
With cruise control switched on, it is possible to press the accelerator pedal and accelerate 
through the memorised set speed. When the accelerator is released, the cruise control ECU 
will automatically return the vehicle to its set speed. 
Note: The cruise control system will only operate between speeds of 22 mph (35 km/h) and 
125 mph (200 km/h).
Cruise control operation can be suspended by one of the following ways:
zBy pressing the Res switch.
zBy pressing the brake pedal.
zThe gearbox is placed in park, neutral, or reverse.
zHill Descent Control (HDC) is active.
zEngine revs are too high.
Under all these conditions, the cruise control set speed will be memorised. Cruise control 
operation can be resumed by pressing the Res switch.
Cruise control operation can be cancelled in one of two ways:
zBy pressing the cruise control master switch located on the centre console.
zBy switching the ignition off.
In both these cases, the cruise control set speed will be lost.
Warning: Do not switch off the vehicle ignition unless the vehicle is stationary and 
the handbrake is applied. 
						

							DESCRIPTION AND OPERATION
FREELANDER 03MY 4.53
OPERATION
General
Feed from the positive battery terminal (C0192) is supplied to the horn relay and fusible link 
3 of the engine compartment fuse box (C0632) on an R wire. Fusible link 3 (C0571) is 
connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to 
the ignition position, current flows across the switch (C0028) to fuse 35 of the passenger 
compartment fuse box (C0588) on a G wire. Fuse 35 (C0580) provides an ignition feed to 
the following:
zThe cruise control master switch (C0749) on a W then WK wire.
zThe cruise control interface unit (C1959) on a W wire (via header 292).
zThe brake pedal sensor (C0652) on a W wire (via header 292).
The ignition switch (C0028) also provides a feed to fuse 2 of the passenger compartment 
fuse box (C0588) on an NW wire. Fuse 2 (C0580) provides an ignition feed to the brake 
pedal switch (C0075) on a G wire.
Cruise Control Master Switch
The cruise control master switch (C0749) is mounted in the centre console and is provided 
an ignition feed from fuse 35 of the passenger compartment fuse box (C0580) on a W then 
WK wire. When the switch is pressed, current flows across the switch contacts (C0749) to 
the cruise control interface unit (C1959) and the cruise control ECU (C0239) on WY wires.
NOTE: When the cruise control system is switched off using the master switch, any stored 
road speed values will be lost.
Cruise Control ECU
When cruise control is activated, the cruise control ECU (C0239) receives a feed from the 
cruise control master switch (C0749) on a WY wire. The ECU (C0239) is earthed on a B wire. 
To enable it to control the cruise control system, the ECU receives a number of inputs from 
various sources as follows: 
						

							DESCRIPTION AND OPERATION
4.54FREELANDER 03MY
ABS ECU 
The ABS ECU (C0501) provides a pulsed wheel speed signal to the cruise control ECU 
(C0239) on a WO wire. The rate of pulses provided by the ABS ECU increases by 2.22 Hz 
for every mile per hour speed increase (approximately 8,000 pulses per mile travelled). This 
enables the cruise control ECU to calculate the road speed of the vehicle. If vehicle speed 
is outside the operating limits (see  Description), the cruise control ECU will not activate the 
system.
NOTE: If the Cruise Control ECU fails to receive a pulsed wheel speed signal from the ABS 
modulator, cruise control will not operate.
For more information on ABS ECU operation, refer to the  Anti-lock Braking System (ABS) 
section of this manual.
 
+  ANTI-LOCK BRAKING SYSTEM (ABS). 
Set + Switch
The non latching Set + switch (C1254) is provided a feed via the horn relay (C0576) on a PY 
wire. When the switch is pulled back against spring pressure, the switch contacts close and 
a feed is provided to the cruise control ECU (C0239) via the rotary coupler (C0082) on a RW 
wire. 
If cruise control is active, and the switch is operated for the first time, the cruise control ECU 
will store the current vehicle speed in its memory and maintain that speed.
NOTE: The cruise control ECU will only store and maintain the vehicle speed if it is within 
the operating limits given in the Description section above.
If the switch is tapped a second time, the ECU will increase the vehicle speed by 1 mph. If 
the switch is pulled back and held against spring pressure, the vehicle will accelerate until 
the switch is released. The final vehicle speed in both instances will be stored in the cruise 
control ECU memory.
Res Switch
The non latching Res switch (C1254) is provided a feed via the horn relay (C0576) on a PY 
wire. When the switch is pulled back against spring pressure, the switch contacts close and 
a feed is provided to the cruise control ECU (C0239) via the rotary coupler (C0082) on a UW 
wire. 
If the Res switch is pulled back against spring pressure, the cruise control ECU will alter 
vehicle speed to reflect the vehicle speed held within its memory. If the Res switch is pulled 
back for a second time, cruise control operation will be suspended 
NOTE: If a road speed value is not held within the cruise control ECU memory, the ECU will 
not respond to the Res switch input. To enter a vehicle speed into the ECU memory, refer 
to the Set + Switch section above.
  
						

							DESCRIPTION AND OPERATION
FREELANDER 03MY 4.55
Brake Pedal Sensor
The Hall effect brake pedal sensor (C0652) is provided an ignition feed from fuse 35 of the 
passenger compartment fuse box (C0580) on a W wire. The sensor (C0652) is earthed on 
a B wire. When the brake pedal is in its normal position, the sensor provides the cruise 
control interface unit (C1959) a low voltage (between approximately 0V and 2V) on a PG 
wire. When the brake pedal is pressed, this voltage rises to between approximately 6V and 
battery voltage. When the interface unit registers this rise in voltage, it suspends cruise 
control operation.
The brake pedal sensor (C0652) also provides a brake pedal status signal to the cruise 
control interface unit (C1959) on a GR wire.
Interface Unit
The interface unit (C1959) provides a feed to the cruise control ECU (C0239) on a PG wire 
if the following conditions exist:
zThe cruise control master switch is depressed.
zThe brake pedal is not depressed.
zHDC is not activated.
zThe gear selector lever is not in the park, neutral, or reverse positions.
zEngine speed is below 6,496 rpm.
The cruise control ECU uses the feed provided by the interface unit to enable the cruise 
control pump. For more details on interface unit operation, refer to the  Interface Unit  
section below.
Interface Unit
Fuse 35 of the passenger compartment fuse box (C0580) provides an ignition feed to the 
interface unit (C1959) on a W wire. The interface unit is earthed on a pair of B wires, and 
receives inputs from a number of different components as follows:
Cruise Control Master Switch
When the cruise control master switch is depressed, it provides a feed to the interface unit 
(C1959) on a WY wire. 
Brake Pedal Sensor
When the brake pedal is in its normal position, the sensor (C0652) provides the interface 
unit (C1959) a low voltage (between approximately 0V and 2V) on GR and PG wires. When 
the brake pedal is pressed, this voltage rises to between approximately 6V and battery 
voltage.