Land Rover Freelander 2004my Electrical Library Rover Manual
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DESCRIPTION AND OPERATION 4.92FREELANDER 04MY Engine Control Module (ECM) On vehicles fitted with manual transmission, a feed is provided to the ECM (C0331) on a GY wire when the PTC heater is operational. This signal feed informs the ECM to raise the engine idle speed.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.93 COOLING FANS DESCRIPTION K Series K Series vehicles are fitted with a single cooling fan, which is mounted on the rear face of the radiator. Operation of the single speed cooling fan is controlled by the Engine Control Module (ECM) via the cooling fan relay. NOTE: Vehicles fitted with Air Conditioning (A/C) are also fitted with a condenser fan and a cooling fan control unit. For more information, refer to the Air Conditioning (A/C) – K Series and KV6 section of this manual. + AIR CONDITIONING (A/C) – K SERIES AND KV6. The cooling fan will also operate after the ignition has been switched off to control rising engine bay temperatures after the engine has stopped running. KV6 and Td4 KV6 and Td4 vehicles are fitted with a fan to control the temperature within the E-box. If the temperature within the E-box reaches 35 °C (95 °F), the fan operates until the temperature drops to 27 °C (80 °F). For information on cooling fan operation, refer to the Air Conditioning (A/C) – Td4 , Air Conditioning (A/C) – K Series and KV6, or Air Conditioning (A/C) – KV6 (North America) section of this manual. + AIR CONDITIONING (A/C) – Td4. + AIR CONDITIONING (A/C) – K SERIES AND KV6. + AIR CONDITIONING (A/C) – KV6 (NORTH AMERICA). OPERATION Td4 Feed from the positive battery terminal (C0192) is supplied to fusible link 1 and the main relay (C0632) on an R wire. Both are located in the engine compartment fuse box. Operation of the main relay (C0576) is controlled by the Engine Control Module (ECM) (C0603) on a WK wire. The energised main relay provides a feed to fuse 4, which is also located in the engine compartment fuse box. Fusible link 1 is connected in series with fusible link 7. Fusible link 7 provides a constant battery feed to the starter relay, which is also located in the engine compartment fuse box. Operation of the starter relay (C0576) is controlled by the ECM (C0059) on an RW wire. The relay coil (C0576) is earthed on a B wire. The energised starter relay (C0572) provides a feed to the E-box fan (C0646) on an NR wire.
DESCRIPTION AND OPERATION 4.94FREELANDER 04MY E-box Fan Fuse 4 of the engine compartment fuse box (C0575) provides a feed to the E-box temperature sensor (C1258) on an NK wire. The temperature sensor is a thermostatic switch. When the temperature within the E-box reaches 35 °C (95 °F) the switch contact close. Current flows across the switch contacts (C1258) to the E-box fan (C0646) on an NK wire. The E-box fan (C0646) is earthed on a B wire. When the temperature within the E-box drops to 27 °C (80 °F), the switch contacts within the sensor open, cutting the feed to the E-box fan. K Series Feed from the positive battery terminal (C0192) is supplied to fusible link 5, and the main relay on an R wire. Both are located in the engine compartment fuse box. Fusible link 5 (C0573) provides a constant battery feed to the cooling fan relay (C0019) on an SU wire. Operation of the main relay (C0576) is controlled by the ECM (C0913) on a WK wire. When energised, the main relay provides a feed to fuse 4, which is also located in the engine compartment fuse box. Fuse 4 (C0575) is connected to the cooling fan relay (C0019) by an NK wire. Engine Coolant Temperature (ECT) Sensor The ECM monitors Engine Coolant Temperature (ECT) via the ECT sensor. The ECM (C0914) provides a feed to the ECT sensor (C0169) on a KG wire. As ECT rises, the resistance of the sensor falls. By measuring the voltage returned from the ECT sensor (C0169) on a KB wire, the ECM (C0914) can determine ECT. Cooling Fan When the ECM (C0913) registers a temperature of 102 °C (215 °F) via the ECT sensor, it energises the cooling fan relay by providing an earth path for the relay coil (C0019) on a UR wire. The energised cooling fan relay (C0019) provides a feed to the cooling fan motor (C0005) on an NR wire. The cooling fan motor (C0005) is earthed on a B wire. KV6 Feed from the positive battery terminal (C0192) is supplied to fusible link 3 and the main relay (C0632) on an R wire. Both are located in the engine compartment fuse box. Operation of the main relay (C0578) is controlled by the ECM (C0604 on KV6 NAS vehicles, C0371 on KV6 ROW vehicles) on a WK wire (NG on KV6 NAS vehicles). The energised main relay provides a feed to fuse 4, which is also located in the engine compartment fuse box. 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 5 of the passenger compartment fuse box (C0588) on a WR wire. Fuse 5 (C0581) provides an ignition feed to the E-box fan (C0646) on a WR wire.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.95 E-box Fan Fuse 4 of the engine compartment fuse box (C0575) provides a feed to the E-box temperature sensor (C1258) on an NK wire. The temperature sensor is a thermostatic switch. When the temperature within the E-box reaches 35 °C (95 °F) the switch contact close. Current flows across the switch contacts (C1258) to the E-box fan (C0646) on an NK wire. The E-box fan (C0646) is earthed on a B wire. When the temperature within the E-box drops to 27 °C (80 °F), the switch contacts within the sensor open, cutting the feed to the E-box fan.
DESCRIPTION AND OPERATION 4.96FREELANDER 04MY HEATED REAR WINDOW (HRW) DESCRIPTION General The HRW comprises eleven metallic strips bonded to the inside surface of the tail door glass to form an element. The metallic strips terminate in two larger strips at the bottom of the glass. Two connectors bonded to the terminations provide attachment of the supply and earth connections. The HRW is controlled by the Central Control Unit (CCU) via a non latching switch mounted on the centre console. The switch has an illumination LED to show when the HRW is operational. The switch is also illuminated by a separate bulb when the side or headlamps are switched on. For more information on switch illumination, refer to the Interior Illumination section of this manual. + INTERIOR ILLUMINATION. The CCU will only operate the HRW when all of the following conditions are met: zThe HRW switch is pressed. zThe engine is running. zThe tail door window is closed. zThe roof is fitted (3 door models only). NOTE: The HRW will not operate if the tail door window has not been calibrated. For more information on tail door window calibration, refer to the Windows section of this manual. + WINDOWS – 5 DOOR. The CCU will switch the HRW off automatically after approximately 15 minutes. OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 3 and fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) provides a constant battery feed to the HRW relay and fuse 16 of the passenger compartment fuse box (C0587) on an NW wire. NOTE: Only 3 door vehicles utilise fuse 16 for HRW operation. The earth path for the HRW coil is controlled by the CCU (C0592), which is connected directly into the rear of the passenger compartment fuse box. The CCU will only provide an earth path for the relay coil if the ignition is switched on, and the engine is running.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.97 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 18 of the passenger compartment fuse box (C0588) on a G wire. Fuse 18 provides an ignition feed to the CCU (C0593). When the CCU receives an ignition feed, it provides a feed to the HRW switch (C0072) on a GY wire. When the switch is pressed, current flows across the switch contacts (C0072) to earth on a B wire. The first of two electrical switches within the CCU will now close. When the ignition is switched on, the CCU (C0592) also provides a feed to the oil pressure switch (C0187) via the passenger compartment fuse box (C0581) on an NW then WN wire. The oil pressure switch contacts are closed when there is no oil pressure. When the engine is started, the rise in oil pressure causes the switch contacts to open. When the switch contacts open, the second electrical switch within the CCU closes. When both electrical switches within the CCU are closed, the CCU (C0592) provides an earth path for the HRW relay coil. The energised HRW relay provides a feed to fuse 26, which is also located in the passenger compartment fuse box. Fuse 26 (C0583) provides a feed to the HRW element (C0381) on an N wire. The HRW element (C0382) is earthed on a B wire. Fuse 26 (C0583) also provides a feed to the switch illumination LED (C0072) on an NG wire. The LED (C0072) is earthed on a B wire. The CCU will de-energise the HRW relay by removing its earth path after approximately 15 minutes has elapsed, or if the ignition is switched off. Tail Door Window Lift The HRW will not operate if the tail door glass is not in the fully closed position. If the tail door window is opened while the HRW is operational, the CCU suspends the feed to the HRW element by de-energising the HRW relay. The CCU (C0428) monitors the condition of the tail door window via the tail door window switch (C0354) on BR and BK wires. The switch (C0354) is earthed on a B wire. For more information on tail door window operation, refer to the Windows section of this manual. + WINDOWS – 5 DOOR. Roof On Switch (3 Door Vehicles Only) Fuse 16 of the passenger compartment fuse box (C0580) provides a constant battery feed to the roof on switch (C0497) on a P wire. The roof on switch is closed when the hard back is fitted, or the soft back is in the fitted position. In this instance, current flows across the switch (C0497) to the CCU (C0428) on a PY wire. If the hard back is removed (or the soft back is folded down) the roof on switch becomes open circuit, and the feed to the CCU is removed. The CCU will now inhibit operation of the HRW.
DESCRIPTION AND OPERATION 4.98FREELANDER 04MY HEATED FRONT SCREEN (HFS) DESCRIPTION General The Heated Front Screen (HFS) consists of two heater elements which are embedded into the LH and RH sides of the windscreen. Two connectors at the base of the windscreen provide the power feed and an integral earth for each of the heater elements. Operation of the HFS is controlled by the CCU and a non latching switch on the centre console. The switch contains an LED which illuminates while the HFS is on. The CCU de- energises the HFS relay after approximately 5 minutes, when the switch is pressed again or if the engine stops. OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 3 of the engine compartment fuse box (C0632) on an R wire and the Heated Front Screen (HFS) relay (C0994) on an N wire. Fusible link 3 (C0571) provides a constant battery feed to the ignition switch (C0028) on an N wire. When the ignition switch is turned to the ignition position, current flows across the switch (C0028) to fuse 18 of the passenger compartment fuse box (C0588) on a G wire. Fuse 18 provides an ignition feed to the CCU (C0593), which is mounted on the rear of the passenger compartment fuse box. The CCU (C0593) is earthed via the passenger compartment fuse box (C0587) on a B wire. HFS Relay The battery (C0192) provides a constant battery feed to the HFS relay coil (C0994) on an N wire. The earth path for the relay coil (C0994) is controlled by the CCU (C0429) on an SB wire. The CCU will only provide an earth path for the HFS relay coil if all of the following are present: zThe ignition is on. zThe engine is running. zThe HFS switch is pressed. The CCU (C0592) monitors the condition of the oil pressure switch (C0187) on a WN wire. The oil pressure switch contacts are closed when there is no oil pressure. When the engine is started, the rise in oil pressure causes the switch contacts to open.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.99 HFS Switch The CCU (C0429) monitors the condition of the HFS switch (C0131) by providing a feed on a KO wire. When the switch is pressed the CCU senses the momentary earth path, and (providing all other conditions are met) energises the HFS relay. The switch (C0131) is earthed on a B wire. HFS Elements The energised HFS relay (C0994) provides a feed to fuse A and fuse B (C1860) on a pair of NW wires. Fuse A (C1860) provides a feed to the LH screen element (C0247) on a PS wire. Fuse B (C1860) provides a feed to the RH screen element (C0246) on a PW wire. The energised HFS relay (C0994) also provides a feed to fuse C (C1860) on an NW wire. Fuse C (C1860) provides a feed to the HFS switch tell-tale LED (C0131) on a PK wire. The LED (C0131) is earthed on a B wire.
DESCRIPTION AND OPERATION 4.100FREELANDER 04MY WIPERS AND WASHERS DESCRIPTION Front Wipers Operation of the windscreen wipers is controlled by the Central Control Unit (CCU). There are four modes of wiper operation. These are selectable from the RH column stalk when the ignition switch is in the ignition position. NOTE: Windscreen wiper operation is temporarily suspended while the engine in cranking. The modes of windscreen wiper operation are: zSlow wipe. zFast wipe. zIntermittent wipe. zFlick wipe. Washers The windscreen washer jets are controlled by the CCU and are operated by pulling the RH column stalk back against spring pressure. When the washer jets are operated, the windscreen wipers will start operating at slow speed after a delay of approximately 0.6 seconds. The wipers will continue to operate at slow speed until approximately 2 seconds after the RH wiper stalk is released. Rear Wiper The rear wiper is switched on and off by pressing the switch mounted on the centre of the fascia. The rear wiper is controlled by the Central Control Unit (CCU) and will only operate when the ignition switch is in the ignition position. NOTE: Rear wiper operation will NOT be suspended while the engine is cranking. The rear wiper will stop operating and return to its park position if any of the following occur: zThe tail door is opened. zThe tail door window is opened. zThe roof is removed (3 door vehicles only). If the windscreen wipers are in operation and reverse gear is selected, the rear wiper will automatically operate at slow speed, irrespective of rear wiper switch position. The rear wiper will stop operating when reverse gear is de-selected.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.101 Washer The rear washer is operated by pressing the non-latching switch mounted on the centre of the fascia. The washer will operate until the switch is released. The rear wiper will start operating at slow speed as soon as the washer switch is depressed, and will continue to operate at slow speed for approximately 6 seconds after the switch is released. OPERATION Front General Feed from the positive battery terminal (C0192) is supplied to 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 8 (C0588) on a G wire, and fuse 1 (C0588) on an NW wire. Both are located in the passenger compartment fuse box. Fuse 8 and fuse 1 (C0593) both provide an ignition feed to the front wiper relay contained within the Central Control Unit (CCU). The CCU (C0593) is earthed via the passenger compartment fuse box (C0587) on a B wire. Intermittent Wipe Fuse 1 of the passenger compartment fuse box (C0581) provides an ignition feed to the wiper switch (C0035) on an LG wire, and the variable wipe potentiometer (C0320) on a GY wire. When the wiper switch is moved to the intermittent wipe position, current flows across the switch (C0035) to the CCU (C0428) on a G wire. The variable wipe potentiometer has 5 pre-set positions. The potentiometer (C0320) is connected to the CCU (C0429) by a WK wire. The voltage supplied to the CCU by the potentiometer is dependent upon its position. The CCU is able to determine the amount of delay to apply to the wipers by measuring the voltage provided on the WK wire. When the CCU receives a feed from the intermittent wipe switch and the potentiometer, it provides an intermittent feed back to the wiper switch (C0035) on a LGK wire. The wiper switch (C0035) is connected to the wiper motor (C0030) by a ULG wire. Current flows across the motor slow speed windings and is earthed (C0030) on a B wire. Slow Wipe Fuse 1 of the passenger compartment fuse box (C0581) provides an ignition feed to the wiper switch (C0035) on a G wire. When the wiper switch is moved to the slow wipe position, current flows across the switch (C0035) to the wiper motor (C0030) on a ULG wire. Current flows across the motor slow speed windings and is earthed (C0030) on a B wire.