Land Rover Freelander 2003my Electrical Library Rover Manual
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DESCRIPTION AND OPERATION 4.86FREELANDER 03MY Blower Speed 3 If blower speed 3 is selected, current flows across the blower motor switch (C0058) to the resistor pack (C0425) on an RG wire. The resistor pack (C0425) is connected to the blower motor (C0056) by a GK then G wire. As current has to flow through the smallest value resistor, the blower motor operates at an increased speed. Blower Speed 4 If blower speed 4 is selected, current flows across the blower motor switch (C0058) to the blower motor relay coil (C0153) on an RS wire. The relay coil (C0153) is earthed on a BS then B wire. The energised blower relay allows a feed from fuse 8 of the engine compartment fuse box (C0576) across the closed relay switch (C0153) directly to the blower motor (C0056) on a GR then G wire. As current by-passes the resistor pack, the blower motor operates at high speed. Fresh/Recirculated Air Fuse 4 of the passenger compartment fuse box (C0586) provides an ignition feed to the fresh/recirculated air motor (C0006) and the fresh/recirculated air switch (C0750) on G then LGS wires. When the switch is the normal (released) position, it provides an earth path for the motor (C0006) via a Y wire. The motor will open the recirculation flap, allowing the heater to use air drawn from outside the vehicle. If the fresh/recirculated air switch is pressed, it provides an earth path for the motor (C0006) via a K wire. The motor will now close the recirculation flap, allowing the heater system to use recirculated air. The switch is mounted on the centre console and is earthed (C0750) on a B wire.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.87 FUEL BURNING HEATER (FBH) DESCRIPTION General A Fuel Burning Heater (FBH) is used to compensate for the lower operating temperatures of diesel engines by heating engine coolant before it enters the heater matrix. For a detailed description of FBH operation, refer to the Heating and Ventilation section of the System Description and Operation Workshop manual. OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 1 of the engine compartment fuse box (C0632) on an R wire. Fusible link 1 is connected in series with fuse 5, which is also located in the engine compartment fuse box. Fuse 5 (C0576) provides a constant battery feed to the Fuel Burning Heater (FBH) (C0926) on a PN wire. The FBH (C0926) is earthed on a B wire. When the engine is running, the alternator (C0226) provides the Engine Control Module (ECM) (C0606) a Pulse Width Modulated (PWM) signal on a U wire. When the ECM (C0331) receives this signal it provides a feed to the FBH temperature sensor (C0714) on an NY wire. The FBH temperature sensor measures ambient air temperature, and is a normally open switch. If an ambient air temperature of below 5 °C is measured, the FBH temperature sensor closes. The ECM feed can now flow across the sensor (C0714) to the FBH (C0925) on an SG wire. On receiving this feed, the FBH will power the FBH pump. The FBH (C0925) sends a PWM signal to the FBH pump (C0920) on a WU wire. By varying the frequency of the pulses, the FBH can control the pump to operate at one of three speeds. The pump (C0920) is earthed on a B wire. Diagnostic Socket The FBH can be interrogated using TestBook or T4 via the diagnostic socket. The diagnostic socket (C0040) is connected to the FBH (C0925) by a K wire.
DESCRIPTION AND OPERATION 4.88FREELANDER 03MY POSITIVE TEMPERATURE COEFFICIENT (PTC) HEATER DESCRIPTION General The Positive Temperature Coefficient (PTC) heater replaces the Fuel Burning Heater (FBH) fitted to Td4 vehicles in markets of a moderate climate. The PTC heater, like the FBH, is an auxiliary heating system that compensates for the relatively low coolant temperature inherent in the diesel engine. The PTC heater is an electrical heating element installed in the heater assembly on the downstream side of the heater matrix. For a more detailed description of PTC heater operation, refer to the Heating and Ventilation section of the System Description and Operation Workshop manual. NOTE: Cold climate specification vehicles still maintain the FBH. OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 1 of the engine compartment (C0632) on an R wire. Fusible link 1 is connected in series with fusible link 2, which is also located in the engine compartment fuse box. Fusible link 2 (C0571) is connected to the ignition switch (C0028) by an NR wire. When the ignition switch is turned to the ignition position, current flows across the switch (C0028) to fuse 4 of the passenger compartment fuse box (C0588) on an SU wire. Fuse 4 (C0586) provides an ignition feed to the blower motor switch (C0058) on a G then LGS wire. The battery (C0192) also provides a feed to fusible link 1 (C1875) located in the fuse holder on an R wire. Fusible link 1 (C1875) provides a constant battery feed to PTC relay 2 (C0157) on an N wire. PTC Switch If the rotary blower motor switch is turned to position 1 or higher, current from fuse 4 of the passenger compartment fuse box (C0586) flows across the switch (C0058) to the PTC switch (C0422) on an SW wire. The PTC switch is mounted on the rear of the rotary temperature control switch. When the temperature control switch is in the cold to warm position (i.e. less than approximately 1 oclock), the PTC switch contacts are open. If the temperature control switch is turned to the warm to hot position (i.e. approximately 1 oclock and above) the PTC switch contacts close. This allows current to flow from the PTC switch (C0422) to PTC relay 1 (C0154) on a GW wire.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.89 PTC Relays Operation of the PTC heater is controlled by two relays. PTC relay 1 is the control relay and is mounted on the side of the E-box. PTC relay 2 is the power relay and is mounted on the engine bulkhead, behind the engine compartment fuse box. PTC Relay 1 The coil of PTC relay 1 (C0154) receives a feed from the PTCswitch (C0422) on a GW wire. The relay coil (C0154) is earthed on a B wire. When energised, PTC relay 1 (C0154) provides an earth path for PTC relay 2 (C0157) on a G then GY wire. PTC Relay 2 The coil of PTC relay 2 (C0157) receives a feed from the fuel pump relay (C0572) on a WP then GR wire. When PTC relay 1 is energised, it provides an earth path for the relay coil of PTC relay 2 on a G then GY wire. This allows a battery feed from fusible link 1 (C1875), located in the fuse holder, to flow across the closed relay switch contacts to fuse 1, fuse 2, and fuse 3 (C1876) on B wires. All are located in the fuse holder. For more information on fuel pump relay operation, refer to the Fuel Pump section of this manual. + FUEL PUMP. PTC Heater The PTC heater is powered via three fuses located in an additional fuse holder. The fuse holder is mounted on the side of the E-box. Fuses 1, 2, and 3 (C1876) are provided a feed by the energised PTC relay 2 (C0157) on B wires, and power the PTC heater elements (C2123) as follows: zFuse 1 is connected to PTC heater element 3 by a BP wire. zFuse 2 is connected to PTC heater element 2 by a BN wire. zFuse 3 is connected to PTC heater element 3 by a BG wire. Engine Control Module (ECM) On vehicles fitted with manual transmission, a feed is provided to the ECM (C0331) on a G then GY wire when the PTC heater is operational. This signal feed informs the ECM to raise the engine idle speed.
DESCRIPTION AND OPERATION 4.90FREELANDER 03MY 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 FREELANDER 03MY 4.91 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 4.92FREELANDER 03MY 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 FREELANDER 03MY 4.93 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. 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 14 of the passenger compartment fuse box (C0587) on an NW wire. NOTE: Only 3 door vehicles utilise fuse 14 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 4.94FREELANDER 03MY 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 of the passenger compartment fuse box (C0588) on a G wire. Fuse 8 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 via the passenger compartment fuse box (C0587) on a B wire. The energised HRW relay provides a feed to fuse 23, which is also located in the passenger compartment fuse box. Fuse 23 (C0583) provides a feed to the HRW element (C0381) on an N wire. The HRW element (C0382) is earthed on a B wire. Fuse 23 (C0580) 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.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.95 Roof On Switch (3 Door Vehicles Only) Fuse 14 of the passenger compartment fuse box (C0583) 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.