Land Rover Freelander 2003my Electrical Library Rover Manual
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DESCRIPTION AND OPERATION 4.96FREELANDER 03MY 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 8 of the passenger compartment fuse box (C0588) on a G wire. Fuse 8 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 03MY 4.97 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 PK wire (PW on vehicles from 03MY). 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 4.98FREELANDER 03MY 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 RH side of the instrument pack. 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 03MY 4.99 Washer The rear washer is operated by pressing the non-latching switch mounted on the RH side of the instrument pack. 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 3 (C0588) on an NW wire. Both are located in the passenger compartment fuse box. Fuse 8 and fuse 3 (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 3 of the passenger compartment fuse box (C0580) 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 3 of the passenger compartment fuse box (C0580) 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.
DESCRIPTION AND OPERATION 4.100FREELANDER 03MY Fast Wipe Fuse 3 of the passenger compartment fuse box (C0580) provides an ignition feed to the wiper switch (C0035) on a G wire. When the wiper switch is moved to the fast wipe position, current flows across the switch (C0035) to the wiper motor (C0030) on a RG wire. Current flows across the motor fast speed windings and is earthed (C0030) on a B wire. Park Fuse 3 of the passenger compartment fuse box (C0582) provides an ignition feed to the wiper motor park switch (C0030) on an LG wire. The park switch is closed with the wipers in any position other then the park position. When the wipers are turned off, current flows across the park switch (C0030) to the CCU (C0430) on an NLG wire. The CCU (C0430) is connected to the wiper switch (C0035) by an LGK wire. The wiper switch (C0035) provides a feed to the wiper motor (C0040) on a ULG wire. Current flows across the motor slow speed windings and is earthed (C0030) on a B wire. When the wipers reach the park position, the switch contacts open and power to the wiper motor is cut. Washers Fuse 3 of the passenger compartment fuse box (C0580) provides an ignition feed to the washer switch (C0035) on an LG wire. When the RH column stalk is pulled back against spring pressure, current flows across the switch (C0035) to the washer pump (C0008) on a LGB wire. The washer pump (C0008) is earthed on a B wire. The washer switch (C0035) also provides a feed to the CCU (C0428) on an LGB wire. When the CCU receives this feed, it initiates its programmed wash/wipe function. Rear General Feed from the positive battery terminal (C0192) is provided to fusible link 3, and fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) is connected to fuse 30 and fuse 14 of the passenger compartment fuse box (C0587) by an NW wire. Fuse 30 (C0583) provides a constant battery feed to the rear wiper relay (C0124) on a PR wire. Fuse 14 (C0583) provides a constant battery feed to the Roof On switch (C0497) on a P 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 1 of the passenger compartment fuse box (C0588) on an NW wire. The ignition switch (C0028) also provides a feed to fuse 8 of the passenger compartment fuse box (C0588) on a G wire.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.101 Wiper The CCU (C0592) monitors the condition of the wiper switch (C0079) by providing a feed via the passenger compartment fuse box (C0589) on an RG wire. When the switch is pressed, current flows across the switch contacts (C0079) to earth on a B wire. When the CCU registers this earth, it provides a feed to the rear wiper relay (C0124) on a YB wire. The rear wiper relay contains two independent relays; a forward relay and a reverse relay. The energised forward relay (C0124) is now able to provide a feed to the wiper motor (C0388) on a GR wire. Current flows across the motor windings (C0388) and back to the rear wiper relay (C0124) on a G wire. To move the wiper back, the CCU (C0429) removes the feed to the wiper relay on a YB wire and provides a feed on a YW wire. This feed energises the reverse relay, which is earthed on a B wire. The energised reverse relay (C0124) is now able to provide a feed to the wiper motor (C0388) on a G wire. Current flows across the motor windings (C0388) and back to the rear wiper relay (C0124) on a GR wire. Off-Screen Park The CCU (C0428) monitors the off-screen park function of the rear wiper (C0388) by providing a signal feed on OB and NG wires. For more information on the off-screen park function, refer to the Wipers and Washers section of the Workshop manual. Tail Door Window Lift The rear wiper will not operate if the tail door glass is not in the fully closed position. If the tail door window is open. 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. Washer Fuse 1 of the passenger compartment fuse box (C0589) provides an ignition feed to the washer switch (C0073) on a GY wire. When the switch is depressed, current flows across the switch contacts (C0073) to the washer pump relay (C0936) and the CCU (C0428) on GB wires.
DESCRIPTION AND OPERATION 4.102FREELANDER 03MY When the CCU receives this feed, it initiates its programmed wash/wipe function, and provides a feed to the rear wiper relay (C0124) on a YB wire. The rear wiper relay operates the rear wiper as described above. The rear wiper relay (C0124) also provides a feed to the washer pump relay (C0936) on a GR wire. This energises the washer pump relay, which is earthed on a B wire. The energised washer pump relay (C0936) provides a feed to the washer pump (C0021) on a GB wire. The pump (C0021) is earthed on a B wire. Tail Door Switch The CCU (C0428) monitors the condition of the tail door switch (C0616) by providing a feed on a BO wire. The tail door switch is open circuit when the tail door is closed. When the tail door is opened, the switch contacts close and an earth path is created on a B wire. Sensing this earth path, the CCU suspends operation of the rear wiper. 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. When the CCU registers this, it suspends operation of the rear wiper.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.103 BRAKE AND REVERSE LAMPS DESCRIPTION Brake Lamps Three brake lamps are fitted to the rear of the vehicle. Two brake lamps are mounted above the rear bumper, and share a dual filament bulb with the tail lamps. A third, high mounted tail lamp is housed within a casting mounted on the tail door above the spare wheel. NOTE: NAS vehicles are also fitted with a second pair of brake lamp bulbs. These operate in conjunction with the normal brake lamp bulbs. These secondary bulbs are also used as fog lamps. For more information of fog lamp operation, refer to the Fog Lamps section of this manual. + FOG LAMPS. The brake lamps are operated by the brake pedal switch, which is mounted on the pedal box, and will only operate when the ignition switch is in the ignition position. The brake lamps will also operate without operation of the brake pedal. If Hill Descent Control (HDC) is engaged, ABS ECU will operate the brake lamps, responding from signals from the ABS modulator. For more details of HDC, refer to the Brakes section of the Workshop manual. For more information on ABS operation, refer to the Anti-lock Braking System (ABS) section of this manual. + ANTI-LOCK BRAKING SYSTEM (ABS). Reverse Lamps The reverse lamps are incorporated into the tail lamp units, and will only operate when the ignition switch is in the ignition position, and reverse gear is selected. 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. 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 2 of the passenger compartment fuse box (C0588) on an NW wire.
DESCRIPTION AND OPERATION 4.104FREELANDER 03MY Fuse 2 (C0580) provides an ignition feed to the following on G wires: zThe reverse lamp relay (C0935) (automatic transmission vehicles only). zThe brake pedal switch (C0075). Fuse 2 (C0581) also provides an ignition feed to the reverse lamp switch (C0163) (K1.8 and Td4 manual transmission vehicles only) on a G wire. Brake Lamps The brake pedal switch (C0075) is provided an ignition feed from fuse 2 of the passenger compartment fuse box (C0580) on a G wire. When the brake pedal is pressed, current flows across the switch (C0075) to the following on GP wires: zThe RH brake lamp (C0125). zThe RH brake lamp (C0489) (NAS vehicles only). zThe LH brake lamp (C0121). zThe LH brake lamp (C0490) (NAS vehicles only). zThe Centre High Mounted Stop Lamp (CHMSL) (C0613). zThe trailer pick-up (C0499) (GP then R wire). zThe ABS ECU (C0501). All brake lamps are earthed on a B wire. The trailer pick-up is earthed on a W then B wire NOTE: The brake pedal switch (C0075) provides a second feed to the ABS ECU on a GR wire. For more information on ABS operation, refer to the Anti-lock Braking System (ABS) section of this manual. + ANTI-LOCK BRAKING SYSTEM (ABS). Reverse Lamps Manual Transmission Fuse 2 of the passenger compartment fuse box (C0581) provides an ignition feed to the reverse lamp switch (C0163) on a G wire. When reverse gear is selected, current flows across the switch (C0166 on K1.8 vehicles, C0163 on Td4 vehicles) to the RH (C0455) and LH (C0472) reverse lamps on GN wires. Both lamps are earthed on B wires.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.105 Automatic Transmission Fuse 2 of the passenger compartment fuse box (C0580) provides an ignition feed to the reverse lamp relay (C0935) on a G wire. When reverse gear is selected, the Electronic Automatic Transmission (EAT) ECU (C0932) provides a feed to the reverse lamp relay coil (C0935) on an NG wire. The relay coil (C0935) is earthed on a B wire. The energised reverse lamp relay (C0935) is now able to provide a feed to the RH (C0455) and LH (C0472) reverse lamps on GN wires. Both lamps are earthed on B wires. For more information on EAT operation, refer to the Electronic Automatic Transmission (EAT) section of this manual. + ELECTRONIC AUTOMATIC TRANSMISSION (EAT).