Land Rover Defender 2002 Electrical Library Rover Manual
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DESCRIPTION AND OPERATION 4.28DEFENDER 02MY AIR CONDITIONING – Td5 Description General The air conditioning (A/C) system fitted to Defender operates independently of the standard heating and ventilation system. The A/C system is controlled by two rotary switches located on the driver side of the fascia; one switch controls blower speed, the other controls output temperature. In order to gain maximum A/C system performance, the standard heater blower control should be set to 0, and both the temperature and distribution controls in the fully up position. The A/C system will then produce cooled and dehumidified air via the lower fascia vents. NOTE: The A/C system will only operate when the engine is running. For more information on A/C system controls and general operating procedures, refer to the Air Conditioning section of the Owners Handbook. Operation Power Distribution Feed from the positive battery terminal (C0192) is supplied to fusible link 1 and fusible link 5 of the under seat fuse box (C0632) on an N wire. Fusible link 1 is connected in series with fusible link 2, which is also located in the under seat fuse box. Fusible link 2 (C0570) provides a feed to fuse 28 and fuse 29 of the passenger compartment fuse box (C0595) on an NK wire. Fuse 28 (C0595) provides a constant battery feed to the blower motor relay (C0153) on an NP then N wire. Fuse 29 (C0595) provides a constant battery feed to the compressor clutch relay (C1268 on LHD, C0689 on RHD) and the cooling fan relay (C0019) on a pair of NS wires. Fusible link 5 of the under seat fuse box (C0570) is connected to the ignition switch (C1043 on LHD, C0028 on RHD) by an NW wire. When the ignition switch is turned to the ignition position, current flows across the switch (C1732 on LHD, C0094 on RHD) to fuse 15 and fuse 12 (C0580) of the passenger compartment fuse box on a pair of W wires.
DESCRIPTION AND OPERATION DEFENDER 02MY 4.29 Fuse 15 (C0580) provides an ignition feed to the following on WG wires: The blower motor relay (C0153) The air conditioning unit (C1273) The blower motor switch (C1508) The air conditioning temperature control switch (C0275). Fuse 12 (C0580) provides an ignition feed to the Engine Control Module (ECM) (C0658) on a WG wire. Blower Motor The blower motor relay coil (C0153) receives an ignition feed from fuse 15 of the passenger compartment fuse box (C0580) on a WG wire. The relay coil (C0153) is earthed on a UB then B wire. The energised blower motor relay (C0153) provides a feed to the blower motor (C0023) on a UW wire. Blower Speed 1 When the rotary blower switch is in position 1, current flows across the motor windings (C0023) to the blower motor resistor (C0425) on a U wire. The blower motor resistor (C0425) is connected to the blower motor switch (C1508) by a G wire. As current has to flow through a high resistance rating within the blower motor resistor, the blower motor operates at slow speed. The blower motor switch (C1508) is earthed on a UB then B wire. Blower Speed 2 When the rotary blower switch is in position 2, current flows across the motor windings (C0023) to the blower motor resistor (C0425) on a U wire. The blower motor resistor (C0425) is connected to the blower motor switch (C1508) by an NY wire. As current has to flow through a lower resistance rating within the blower motor resistor, the blower motor operates at increased speed. The blower motor switch (C1508) is earthed on a UB then B wire. Blower Speed 3 When the rotary blower switch is in position 3, current flows across the motor windings (C0023) directly to the blower motor switch (C1508) on a U wire. As the blower motor resistor is by-passed, the blower motor operates at fast speed. The blower motor switch (C1508) is earthed on a UB then B wire. Engine Control Module The air conditioning unit (C1273) monitors blower motor operation on a U wire. When the motor is operational, the air conditioning unit (C1273) provides a feed to the Engine Control Module (ECM) (C0658) on a WB then PB wire.
DESCRIPTION AND OPERATION 4.30DEFENDER 02MY Temperature Control The temperature control switch relays operator input to the air conditioning unit, to control A/C system temperature output. The switch (C0275) receives an ignition feed from fuse 15 of the passenger compartment fuse box (C0580) on a WG wire. When the switch is turned to position 1, a feed is provided to the air conditioning unit (C1273) on a UY wire. When the switch is turned to position 2, a feed is provided to the air conditioning unit (C1273) on a RW wire. When the switch is turned to position 3 (maximum cooling), a feed is provided to the air conditioning unit (C1273) on a B wire. The switch (C1273) is earthed on a UB then B wire. Evaporator Temperature Sensor The evaporator temperature sensor is used to ensure the evaporator doesnt freeze. The air conditioning unit (C1273) provides a feed to the temperature sensor (C0134) on a K wire, and receives a return signal on a UW wire. The air conditioning unit (C1273) is earthed on a UB then B wire. Compressor Clutch When A/C is requested, the air conditioning unit (C1273) provides a feed to the Engine Control Module (ECM) (C0658) via the pressure switch (C0279) on a UG then BS then YS wire. If the pressure within the high pressure side of the A/C system is within operational limits, the ECM energises the compressor clutch relay. The compressor clutch relay coil (C0689) receives a feed from the energised main relay (C0063) on an NO wire. To energise the compressor clutch relay the ECM (C0658) provides an earth path for the relay coil (C0689) on a BS wire. The energised compressor clutch relay (C0689) provides a feed to compressor clutch (C0182) on a BG wire. The compressor clutch (C0182) is earthed on a B wire. Condenser Fan The cooling fan relay coil (C0019) is provided a feed by the energised main relay (C0063) on an NO wire. To energise the cooling fan relay, the ECM (C0658) provides an earth path for the relay coil (C0019) on a BP wire. The energised cooling fan relay (C0019) is now able to provide a feed to the condenser fan motor (C0280) on a BN wire. The motor (C0280) is earthed on a B wire.
DESCRIPTION AND OPERATION DEFENDER 02MY 4.31 HEATER Description General The heater operates when the ignition switch is turned to position I or II. The blower motor is controlled via a three position rotary switch, which is located on the driver side of the fascia. Two slider controls are also located on the fascia centre module, controlling heater temperature and direction. Operation Power Distribution Feed from the positive battery terminal (C0192) is supplied to fusible link 5 of the under seat fuse box (C0632) on an N wire. Fusible link 5 (C0570) provides a constant battery feed to the ignition switch (C1043 on LHD, C0038 on RHD) on an NW wire. When the ignition switch is turned to position I, current flows across the switch (C1730 on LHD, C0099 on RHD) to fuse 16 of the passenger compartment fuse box (C0580) on a WO wire. Blower Motor Fuse 16 of the passenger compartment fuse box (C0580) provides a feed to the blower motor (C0023 on RHD, C0056 on RHD) on a PG wire. The earth path for the motor is controlled by the rotary heater switch. Switch Position 0 With the rotary switch in the off position, current cannot flow across the motor windings. Switch Position 1 With the rotary switch in position I, current flows across the motor (C0023 on LHD, C0056 on RHD) to the switch (C1508 on LHD, C0058 on RHD) on a GY wire. The switch (C1508 on LHD, C0058 on RHD) is earthed on a B wire. As current also has to flow through the in– line resistor located in the motor, the motor operates at slow speed. Switch Position 2 With the rotary switch in position II, current flows across the motor (C0023 on LHD, C0056 on RHD) to the switch (C1508 on LHD, C0058 on RHD) on a GS wire. The switch (C1508 on LHD, C0058 on RHD) is earthed on a B wire. As current by–passes the in–line resistor located in the motor, the motor operates at high speed.
DESCRIPTION AND OPERATION 4.32DEFENDER 02MY HEATED REAR WINDOW Description General The Heated Rear Window (HRW) is operated via a latching switch mounted in the fascia console. When the switch is pressed, a warning lamp located in the instrument pack and a switch mounted tell-tale LED both illuminate to indicate the HRW is operating. The HRW only operates when the ignition switch is turned to the ignition position. Operation Power Distribution Feed from the positive battery terminal (C0192) is supplied to fusible link 1 and fusible link 5 of the under seat fuse box (C0632) on an N wire. Fusible link 1 is connected in series with fusible link 2, which is also located in the under seat fuse box. Fusible link 2 (C0570) is connected to fuse 32 of the passenger compartment fuse box (C0595) by an NK wire. Fuse 32 (C0595) provides a constant battery feed to the HRW relay (C0044) on an NO wire. Fusible link 5 (C0570) is connected to the ignition switch (C1043 on LHD, C0028 on RHD) by an NW wire. When the ignition switch is turned to the ignition position, current flows across the switch (C1732 on LHD, C0094 on RHD) to fuse 14 of the passenger compartment fuse box (C0580) on a W wire. Fuse 14 (C0580) provides an ignition feed to the HRW switch (C0072) on a WG wire. HRW When the HRW switch is pressed, current flows across the switch (C0072) to the HRW relay coil (C0044) on a WB wire. The relay coil (C0044) is earthed on a B wire. The energised HRW relay (C0044) provides a feed to the HRW element (C0381) on a WB wire. The element (C0381) is earthed on a B wire. When the HRW switch is pressed, a feed is also supplied to the tell-tale LED (which is integral with the switch), and the instrument pack warning lamp (C0233) on a WB wire. For more information on the warning lamp, refer to the Instruments section of this manual. + INSTRUMENTS.
DESCRIPTION AND OPERATION DEFENDER 02MY 4.33 HEATED FRONT SCREEN Description General The Heated Front Screen (HFS) comprises two separate elements, one RH and one LH. When the switch is pressed, both elements operate simultaneously. A tell-tale LED is located in the switch to inform the driver when the HFS is operational. Operation Power Distribution Feed from the positive battery terminal (C0192) is supplied to fusible link 1 and fusible link 5 of the under seat fuse box (C0632) on an N wire. Fusible link 1 (C0575) is connected to fuse 36 of the passenger compartment fuse box (C0595) by an NO wire. Fuse 36 (C0595) provides a constant battery feed to the HFS relay (C0994) on an NO wire. Fusible link 5 is connected to the ignition switch (C1043 on LHD C0028 on RHD) by an NW wire. When the ignition switch is turned to the ignition position, current flows across the switch (C1732 on LHD, C0094 on RHD) to fuse 15 of the passenger compartment fuse box (C0580) on a W wire. Fuse 15 (C0580) provides an ignition feed to the HFS timer unit (C1623) on an WG wire. HFS Timer Unit The HFS timer unit (C1623) monitors the condition of the HFS switch (C0131) by providing a feed on a KO wire. When the HFS switch is pressed, an earth path is created on a B wire. In order for the HFS timer unit to operate the HFS, it must also receive an ignition feed from fuse 15 of the passenger compartment fuse box, and an engine running signal from the oil pressure switch (C0187) on a WN wire. When both of these are received, the HFS timer unit (C1623) energises the HFS relay (C0994) by providing a feed to the relay coil on a PY wire. The relay coil (C0994) is earthed on a B wire. The energised HFS relay (C0994) provides a feed to the HFS elements (C0247) and the HFS switch tell-tale LED (C0131) on PS wires. Both are earthed on B wires.
DESCRIPTION AND OPERATION 4.34DEFENDER 02MY WIPERS AND WASHERS Description General The front wipers are controlled via the wash/wipe switch mounted on the steering column. The front wipers have two speed settings, a flick wipe facility, and an intermittent wipe function, which is controlled by a wiper delay ECU. The wiper delay ECU also controls the programmed wash wipe function, which is activated by pressing the end of the wash/wipe switch. The rear screen wiper is controlled via a latching switch mounted on the fascia centre module. The rear screen wash facility is controlled via a separate non-latching switch, which is also located on the fascia centre module. Operation Power Distribution Feed from the positive battery terminal (C0192) is supplied to fusible link 5 of the under seat fuse box (C0632) on an N wire. Fusible link 5 (C0570) is connected to the ignition switch (C1043 on LHD, C0028 on RHD) by an NW wire. When the ignition switch is turned to the ignition position, current flows across the switch (C1732 on LHD, C0094 on RHD) to fuse 9 and fuse 10 of the passenger compartment fuse box (C0580) on a W wire. Fuse 9 (C0580) supplies power to the front wash wipe circuit on a WG wire. Fuse 10 (C0580) supplies power to the rear wash wipe circuit on a WG wire. Front Wipers Fuse 9 of the passenger compartment fuse box (C0580) provides an ignition feed to the following on WG wires: The wash/wipe switch (C1740 on LHD, C0278 on RHD) The wiper delay ECU (C0303) The wiper motor park switch (C1593 on LHD, C0030 on RHD). Slow Wipe When the wash/wipe switch is moved to the slow wipe position, current flows from the switch (C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD) on a ULG wire. Current flows across the motor (C1593 on LHD, C0030 on RHD) to earth on a B wire. As current has to flow through the in-line resistor located within the wiper motor, the wiper motor operates at slow speed.
DESCRIPTION AND OPERATION DEFENDER 02MY 4.35 Fast Wipe When the wash/wipe switch is moved to the fast wipe position, current flows across the switch (C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD) on a RLG wire. Current flows across the motor (C1593 on LHD, C0030 on RHD) to earth on a B wire. Current by-passes the in-line resistor located within the wiper motor, enabling the motor to operate at fast speed. Intermittent Wipe When the wash/wipe switch is moved to the intermittent wipe position, current flows across the switch (C1740 on LHD, C0278 on RHD) to the wiper delay ECU (C0303) on a WG wire. The wiper delay ECU (C0303) returns a pulsed voltage signal back to the wash wipe switch (C1740 on LHD, C0278 on RHD) on a YLG wire. The pulsed voltage signal flows through the wash wipe switch (C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD) on a ULG wire. The wiper motor operates at slow speed during the intermittent wipe function. Flick Wipe When the wash/wipe switch is moved upwards against (but not past) spring pressure, the wipers will operate until the switch is released. Current flows across the wash/wipe switch (C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD) on an RLG wire, powering the motor at fast speed until the wash/wipe switch is released. Park Circuit The park circuit allows the wipers to return to their park position when the wash/wipe switch has been moved back to the off position. The park switch is integral with the wiper motor (C1593 on LHD, C0030 on RHD), and receives an ignition feed from fuse 9 of the passenger compartment fuse box (C0580) on a WG wire. The park switch is open circuit when the wipers are in any position other than their park position. When the wipers reach their park position, the switch contacts close, enabling the ignition feed from fuse 9 of the passenger compartment fuse box to flow to the wiper delay ECU (C0303) on an NLG wire. The wiper delay ECU (C0303) then provides a feed to the wash/wipe switch (C1740 on LHD, C0278 on RHD) on a YLG wire. The wipers continue to operate at slow speed (as described in the Slow Wipe section previously) until they reach their park position. The park switch then returns to its open position, cutting the feed to the wiper delay ECU.
DESCRIPTION AND OPERATION 4.36DEFENDER 02MY Programmed Wash Wipe Pressing the end of the wash/wipe switch initiates the programmed wash/wipe function. When the switch is pressed, current flows across the switch (C1740 on LHD, C0278 on RHD) to the windscreen washer pump (C0008) on an LGB wire. The pump (C0008) is earthed on a B wire. When the switch is pressed, the wash/wipe switch (C1740 on LHD, C0278 on RHD) also provides a feed to the wiper delay ECU (C0303) on an LGB wire. The wiper delay ECU (C0303) will now provide a feed to the wash/wipe switch (C1740 on LHD, C0278 on RHD) on a YLG wire, which operates the wipers at slow speed (as described in the Slow Wipe section previously). When the washer switch is released, the wiper delay ECU will operate the wipers for a further three cycles. Rear Wiper Fuse 10 of the passenger compartment fuse box (C0580) provides a feed to the following on WG wires: The rear screen wiper motor park switch (C1105) The rear screen wiper relay (C0124) The rear washer switch (C0073). The earth path for the rear screen wiper relay coil (C0124) is controlled by the rear screen wiper switch (C0079) on a BG wire. When the switch is pressed, current flows across the closed switch contacts to earth on a B wire. The energised rear screen wiper relay (C0124) provides a feed to the wiper motor (C0388) on an RLG wire. Current flows through the wiper motor (C0388) to earth on a B wire. Park Circuit The park circuit allows the rear screen wiper to return to its park position when the wiper switch has been switched off. The park switch is integral with the wiper motor (C1105), and receives an ignition feed from fuse 10 of the passenger compartment fuse box (C0580) on a WG wire. The park switch is open circuit when the wiper is in any position other than its park position. When the wiper reaches its park position, the switch contacts close, enabling the ignition feed from fuse 10 of the passenger compartment fuse box to flow to the wiper relay (C0124) on an NLG wire. The de-energised relay (C0124) provides a feed to the wiper motor (C0388) on an RLG wire. The wiper continues to operate until it reaches its park position. The park switch then returns to its open position, cutting the feed to the wiper relay.
DESCRIPTION AND OPERATION DEFENDER 02MY 4.37 BRAKE AND REVERSE LAMPS Description General The brake lamps illuminate when the ignition switch is turned to position II, and the brake pedal is pressed. The reverse lamps illuminate when the ignition switch is in position II, and the gear selector lever is in the reverse gear position. Operation Power Distribution Feed from the positive battery terminal (C0192) is supplied to fusible link 5 of the under seat fuse box (C0632) on an N wire. Fusible link 5 (C0570) is connected to the ignition switch (C1043 on LHD, C0028 on RHD) by an NW wire. When the ignition switch is turned to the ignition position, current flows across the switch (C1732 on LHD, C0094 on RHD) to fuse 13 and fuse 14 of the passenger compartment fuse box (C0580) on a W wire. Brake Lamps Fuse 13 of the passenger compartment fuse box (C0580) provides an ignition feed to the brake pedal switch (C1038 on LHD, C0075 on RHD) on a GO wire. The brake pedal switch is a normally open switch. When the brake pedal is pressed, the switch contacts close, allowing current to flow from the switch (C1727 on LHD, C0029 on RHD) to the following on GP wires: Defender 90 and 110 The LH brake lamp (C0121) The RH brake lamp (C0125) The Centre High Mounted Stop Lamp (CHMSL) (C0832) The trailer socket (C0499). Defender 130 The LH brake lamp (C0490) The RH brake lamp (C0489) The trailer socket (C0499). All are earthed on B wires. Td5 Vehicles Only When the brake pedal is pressed, a feed is also provided to the Engine Control Module (ECM) (C0658) on a GP wire. The ECM uses this signal to help control fuelling requirements for the engine.