Land Rover Freelander 2004my Electrical Library Rover Manual

							DESCRIPTION AND OPERATION
4.52FREELANDER 04MY
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 (C0895) by an RW 
wire. 
The interface unit (C0895) 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 (C0895) by a UW 
wire. 
The interface unit (C0895) 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 6 of the passenger compartment fuse box (C0581) 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 04MY 4.53
Electronic Automatic Transmission (EAT) ECU
When cruise control is active, the cruise control interface unit (C0895) 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 (C0895) 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
4.54FREELANDER 04MY
CRUISE CONTROL – KV6
DESCRIPTION
General
Cruise control is switched on by pressing the cruise control master switch mounted on the 
drivers side of the fascia. 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 drivers side of the fascia.
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 04MY 4.55
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 6 of the passenger 
compartment fuse box (C0588) on a G wire. Fuse 6 (C0581) provides an ignition feed to the 
following:
zThe cruise control master switch (C0749) on a W then WK wire.
zThe cruise control interface unit (C0895) 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 (C0581) 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 drivers side of the fascia 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:
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).  
						

							DESCRIPTION AND OPERATION
4.56FREELANDER 04MY
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.
Brake Pedal Sensor
The Hall effect brake pedal sensor (C0652) is provided an ignition feed (via header 292) 
from fuse 6 of the passenger compartment fuse box (C0581) 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 (C0895) 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 (C0895) on a GR wire. 
						

							DESCRIPTION AND OPERATION
FREELANDER 04MY 4.57
Interface Unit
The interface unit (C0895) 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 6 of the passenger compartment fuse box (C0581) provides an ignition feed (via 
header 292) to the interface unit (C0895) 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 
(C0895) on a WY wire.
Brake Pedal Sensor
When the brake pedal is in its normal position, the sensor (C0652) provides the interface 
unit (C0895) 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.
Engine Control Module (ECM)
The ECM (C0371) provides a feed to the interface unit (C0895) on a BU wire if the following 
conditions exist:
zHDC is not activated.
zThe gear selector lever is not in the park, neutral, or reverse positions.
zEngine speed is below 6,496 rpm.
For more information on the Siemens ECM, refer to the  Engine Management Systems – 
Siemens  section of the System Description and Operation Workshop manual. 
						

							DESCRIPTION AND OPERATION
4.58FREELANDER 04MY
Cruise Control Pump
When all conditions for cruise control activation have been met, the cruise control ECU 
(C0239) provides a feed to the cruise control pump motor (C0228) on a WU wire. The pump 
motor creates a vacuum in the pump actuator. For a detailed description of actuator 
operation, refer to the  Engine Management Systems – Siemens  section of the Workshop 
manual.
Current flow across the pump motor is controlled by the ECU (C0239) providing a varying 
Pulse Width Modulated (PWM) signal to the other side of the pump motor (C0228) on a BR 
wire. When the correct vehicle speed has been reached, the ECU (C0239) replaces the 
PWM feed with a continuous feed. As the potential difference across the pump motor is now 
0V, the pump motor stops operating.
To maintain the vacuum in the actuator, both the control and dump valves are closed by the 
ECU. To close the valves, the ECU (C0239) provides a feed to the control and dump valves 
(C0228) on a WU wire. Current flows across the control valve (C0228) to the ECU (C0239) 
on a PY wire. Current flows across the dump valve (C0228) to the ECU (C0239) on a BR 
wire.
NOTE: Both the control valve and the dump valve are normally open valves.
When a decrease in speed is requested, the control valve is opened to reduce the 
depression within the actuator. This is done by the ECU (C0239) providing a PWM signal to 
the control valve (C0228) on a PY wire. When the correct speed has been achieved, the 
PWM signal is withdrawn.
When cruise is cancelled, the ECU (C0239) withdraws the feed to the dump valve (C0228) 
on a WU wire. The dump valve now opens, allowing atmospheric pressure into the actuator.
Brake Pedal Switch
As a safety feature, the dump valve is opened if the brake pedal is depressed. If cruise 
control is active and the brake pedal is pressed, the brake pedal switch (C0075) provides a 
feed to the dump valve (C0228) on a GP wire. As the potential difference across the valve 
is 0V, the valve opens allowing atmospheric pressure into the actuator.
Electronic Automatic Transmission (EAT) ECU
When all conditions for cruise control activation have been met, the cruise control ECU 
(C0239) 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).  
						

							DESCRIPTION AND OPERATION
FREELANDER 04MY 4.59
Instrument Pack
When all conditions for cruise control activation have been met, the cruise control ECU 
(C0239) provides a feed to the cruise control LED mounted within the instrument pack 
(C0230) on a WU wire. The cruise control LED is provided an earth by the instrument pack 
(C0230) on a B wire.
Diagnostic Socket
The diagnostic socket (C0040) is connected to the cruise control ECU (C0239) by a K wire, 
enabling the ECU to be interrogated by TestBook or T4. 
						

							DESCRIPTION AND OPERATION
4.60FREELANDER 04MY
ELECTRONIC AUTOMATIC TRANSMISSION (EAT)
DESCRIPTION
General
The Jatco 5–speed automatic transmission fitted to Freelander is controlled by an Electronic 
Automatic Transmission Electronic Control Unit (EAT ECU). The EAT ECU is located inside 
the engine E-box, and receives information from the following sources to calculate when to 
operate the solenoid valves contained within the gearbox to enable quick, smooth, quiet 
gear changes;
zThe Engine Control Module (ECM) via the CAN-BUS,
zThe instrument pack via the CAN-BUS,
zThe cruise control ECU,
zThe automatic transmission selector,
zThe brake pedal switch,
zThe automatic gearbox sensors.
The Jatco automatic gearbox also has a number of different operating modes. When the 
ignition switch is first turned to the ignition position, the gearbox will always revert to the 
Normal mode. For a full description of the 5–speed automatic transmission, refer to the  
Automatic Gearbox – Jatco section of the System Description and Operation Workshop 
manual.
OPERATION
General
Feed from the positive battery terminal (C0192) is supplied to the main relay and fusible link 
3 (C0632) on an R wire. Both are located in the engine compartment fuse box.
The battery also provides a feed to fusible link 4 of the engine compartment fuse box 
(C0632) on vehicles fitted with an instrument dimmer switch. For more information, refer to 
the  Interior Lamps  section of this manual.
 
+  INTERIOR LAMPS.  
						

							DESCRIPTION AND OPERATION
FREELANDER 04MY 4.61
Operation of the main relay (C0576 on Td4 vehicles, C0578 on KV6 vehicles) is controlled 
by the Engine Control Module (ECM) (C0603 on Td4 vehicles, C0604 on KV6 NAS vehicles, 
C0371 on KV6 ROW vehicles) on a WK wire (NG on KV6 NAS vehicles). The energised 
main relay allows a battery feed to flow to fuse 4 of the engine compartment fuse box. Fuse 
4 (C0575) provides a feed to the following:
zThe Electronic Automatic Transmission Electronic Control Unit (EAT ECU) (C0932) on 
a pair of NK wires.
zThe transmission selector (C0244) (vehicles without instrument dimmer only) on a NK 
then a NR wire.
zThe illumination relay (C1976) (vehicles with instrument dimmer only) on a NK then a 
NR wire.
zThe CommandShift switch (C0410) on a NK wire.
For further details of main relay operation, refer to the Engine Management – EDC ,  
Engine Management – Siemens (NAS)  or  Engine Management – Siemens (All Except 
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 6 of the passenger compartment fuse box (C0588) on a G wire. Fuse 6 (C0581) 
provides an ignition feed to the transmission inhibit switch (C0244) on a W wire.