Land Rover Defender 1999 Td5 Electrical Library Rover Manual
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DESCRIPTION AND OPERATION DEFENDER 1999 MY4.17 AIR CONDITIONING - Td5 DESCRIPTION The air conditioning (aircon) system fitted to Defender 1999 MY operates independently of the standard heating and ventilation system. Controlled by 2 switches, the aircon system will only operate when the engine is running and the blower control switch is in at least position I. Both the blower control and temperature control are 3 position switches. The cooled and dehumidified air produced by the aircon system is directed through vents located in the lower fascia bezel. The air conditioning system can be used in conjunction with the standard heating and ventilation system. By combining the two separate systems, the required temperature can be maintained over a wide range of ambient temperatures. OPERATION Feed from the battery positive terminal supplies a feed to fusible link 1 and fusible link 5 of the engine compartment fuse box (C0632-1) on a brown wire. Fusible link 5 (C0570-2) supplies a feed to the ignition switch (C0028-1) on a brown/white wire. Fusible link 1 is wired in series with fusible link 2 of the engine compartment fuse box. Fusible link 2 (C0570-1) in turn, supplies a battery feed to fuses 9 and 10 of the passenger compartment fuse box (C0580-17) on a brown/pink wire. Fuse 9 (C0580-18) is connected to the blower relay (C0153-1) by a brown/purple then brown wire. Fuse 10 (C0580-20) supplies a feed to both the compressor clutch relay (C1268-30) and the cooling fan relay (C0019-30) on brown/slate wires. When the ignition switch is turned to position II, current flows to fuse 5 (C0580-9) and fuse 3 (C0580-1) of the passenger compartment fuse box on a white wire. Fuse 5 (C0580-10) supplies a feed to the ECM (C0658-33) on a white/green wire.
DESCRIPTION AND OPERATION 4.18 DEFENDER 1999 MY Fuse 3 of the passenger compartment fuse box (C0580-6) provides a feed to the blower relay (C0153-3) and the air conditioning unit (C1273-11) on white/green wires. The blower relay (C0153-2) is earthed on a blue/black wire and is energised whenever the ignition switch is in position II. This allows a feed from fuse 9 of the passenger compartment fuse box (C0580-18) to flow across the relay (C0153-1 & C0153-4) to the blower motor (C0023-1) on a blue/white wire. The blower motor (C0023-2) is connected to the blower motor resistor (C0068-2) and the blower motor switch (C1494-5) by blue wires. The blower motor switch (C1494-3) is earthed on a blue/black wire. With the ignition switch in position II, the main relay (C0063-87) in the engine bay fuse box is energised and provides a feed to both the compressor clutch relay (C1268-85) and the cooling fan relay (C0019-85) on brown/orange wires. The earth path for the compressor clutch relay (C1268-86) is controlled by the ECM (C0658-29) on a black/slate wire. The earth path for the cooling fan relay (C0019-86) is also controlled by the ECM (C0658-4), this time on a black/purple wire. The ECM receives 2 inputs from the air conditioning system. The trinary switch (C0279-3) provides an input to the ECM (C0658-9) on a black/slate then yellow/slate wire. This input is the aircon clutch request. If granted the ECM provides an earth for the compressor clutch relay. Current can now flow from fuse 10 of the passenger compartment fuse box, across the energised compressor clutch relay (C1268-30 & C1268-87) and supply a feed to the compressor clutch (C0182-1) on a black/green wire. The compressor clutch is earthed (C0182-2) on a black wire.
DESCRIPTION AND OPERATION DEFENDER 1999 MY4.19 The second input to the ECM (C0658-23) is the fan request from the air conditioning unit (C1273-1) on a white/black then purple/black wire. This causes the ECM (C0658-4) to earth the cooling fan relay (C0019-86) on a black/purple wire. Current can now flow from fuse 10 of the passenger compartment fuse box, across the energised cooling fan relay (C0019-30 & C0019-87) and supply a feed to the condenser fan (C0280-1) on a black/brown wire. The fan is earthed (C0280-2) on a black wire.
DESCRIPTION AND OPERATION 4.20 DEFENDER 1999 MY HEATER DESCRIPTION The heater is operated by three sliding controls attached to the instrument binnacle. Two of the controls mechanically regulate the temperature and air flow distribution. The third control is a switch that operates the two speed heater blower. The heater blower operates with the ignition switch in position I or II, and is completely independent of the air conditioning system. OPERATION Feed from the battery positive terminal is connected to fusible link 5 (C0632-1) of the engine compartment fuse box on a brown wire. Fusible link 5 (C0570-2) then supplies a feed to the ignition switch (C0028-1) on a brown/white wire. When the ignition switch is in position I or II, power flows across the switch (C0099-1) to fuse 13 of the passenger compartment fuse box (C0581-5) on a white/orange wire. Fuse 13 (C0581-6) then supplies a feed to the blower motor (C0056-3) on a purple/green wire. When the blower switch is in the Off position, the blower motor has no route to earth and does not run. Moving the blower switch to position I, connects the blower motor (C0056-2) to the blower switch (C0058-2) on a green/yellow wire. Power flows through the motor and the in-line resistor to the switch, which is earthed (C0058-3) on a black wire. The motor will now operate at slow speed. Moving the blower switch to position II, connects the blower motor (C0056-1) directly to the blower switch (C0058-1) on a green/slate wire. Again, the switch is earthed (C0058-3) on a black wire. The blower motor now operates at high speed.
DESCRIPTION AND OPERATION DEFENDER 1999 MY4.21 HEATED REAR WINDOW (HRW) DESCRIPTION The heated rear window (HRW) is operated by a latching switch mounted on the dash panel. When the switch is set to the On position, the instrument panel warning lamp will illuminate to indicate the HRW is operating. The HRW only operates when the ignition switch is turned to position II. OPERATION Feed from the battery positive terminal is connected to fusible link 1 and fusible link 5 of the engine compartment fuse box (C0632-1) by a brown wire. Fusible link 1 is connected in series with fuse 3 of the engine compartment fuse box, which supplies a feed (C0572-1) to the HRW relay (C0044-8) on a brown/purple wire. Fusible link 5 (C0570-2) is connected to the ignition switch (C0028-1) by a brown/white wire. When the ignition switch is turned to position II, current flows across the switch (C0094-1) to fuse 7 of the passenger compartment fuse box (C0580-9) on a white wire. Fuse 7 (C0580-14) then supplies a feed to the HRW switch (C0381-2) on a white/green wire. When the switch is depressed, current is allowed to flow across the switch (C0381-4) and energise the HRW relay (C0044-4) on a white green wire. The relay (C0044-6) is earthed on a black wire. The energised HRW relay (C0044-2) now allows current to flow to both the HRW (C0382-1) and the instrument pack warning lamp (C0233-8) on white/black wires. The instrument pack (C0230-8) is earthed on a black wire.
DESCRIPTION AND OPERATION 4.22 DEFENDER 1999 MY WIPERS AND WASHERS DESCRIPTION The front windscreen wipers are controlled from the column switch and operate when the ignition switch is in position II. The wipers have 2 speed settings, along with a flick wipe and single wipe facility. An intermittent wipe function and programmed wash wipe facility is controlled by the windscreen wiper delay ECU. Moving the wiper switch down from the off position initiates the intermittent wipe function. Moving the wiper switch up one position from the off position, operates the wipers at slow speed. Moving the wiper switch up two positions from the off position, operates the wipers at fast speed. Pushing the wiper switch up from the off position, not allowing it to latch, and then releasing it causes the wipers to perform a single wipe cycle at slow speed. Pushing and holding the wiper switch up from the off position, not allowing it to latch, causes the wipers to operate at slow speed until the wiper switch is released. Pressing the end of the wiper switch, initiates the programmed wash wipe sequence. The windscreen washers operate while the switch is pressed and the wipers continue to operate for a number of cycles after the switch is released. The rear screen wiper and wash facilities are controlled by a switch mounted on the dash panel. Pressing the switch causes the rear washer to operate until the switch is released. The rear wiper does not operate automatically with the rear washer. Turning the switch clockwise causes the rear wiper to operate until the switch is turned back to the off position.
DESCRIPTION AND OPERATION DEFENDER 1999 MY4.23 OPERATION Feed from the positive battery terminal is connected to fusible link 5 of the engine compartment fuse box (C0632-1) by a brown wire. Current passes across fusible link 5 (C0570-2) which is connected to the ignition switch (C0028-1) by a brown/white wire. With the ignition switch in position II, current flows across the switch (C0094-1) to fuses 2 and 3 of the passenger compartment fuse box (C0580-1) on a white wire. Fuse 3 (C0580-6) supplies power to the rear wash/wipe circuit, while fuse 2 (C0580-4) supplies power to the front wash/wipe circuit. Front Wipers and Washers Fuse 2 of the passenger compartment fuse box (C0580-4) supplies a feed to the windscreen wiper delay ECU (C0303-8) on a white/green wire. Slow and Fast Speeds Fuse 2 also provides a feed to the wash/wipe switch (C0278-6) on a white/green wire. Moving the switch to the slow speed position allows power to flow across the switch (C0278-1) to the wiper motor (C0030-3) on a blue/light green wire. This feed into the wiper motor also has to pass through an internal resistor. This extra resistance causes the motor to operate at slow speed. The wiper motor is earthed (C0030-1) on a black wire. Moving the wiper switch to the fast speed position allows power to flow through the switch (C0278-5) to the wiper motor (C0030-5) on a red/light green wire. This time the feed from the switch flows direct to the wiper motor, causing it to operate at fast speed. Again, the motor is earthed (C0030-1) on a black wire. Operating the flick wipe function outputs a feed from the wash/wipe switch (C0278-1) to the wiper motor (C0030-3) on the red/light green wire for as long as the switch is held against spring pressure. The wipers operate at slow speed.
DESCRIPTION AND OPERATION 4.24 DEFENDER 1999 MY Park Circuit Positioning the wash/wipe switch back to the Off position cuts power to the wiper motor on the blue/light green or red/light green wire (depending on the operational speed of the wiper motor). The park circuit operates to return the wipers to their park position. The park switch (C0030-4) is integral to the wiper motor, and receives a feed on a white/green wire from fuse 2 of the passenger compartment fuse box (C0580-4). The park switch is closed with the wipers in any position other than their park position. With the park switch closed, power flows across the switch (C0030-2) to the windscreen wiper delay ECU (C0303-5) on a brown/light green wire. The windscreen wiper delay ECU (C0303-2) is connected to the wash/wipe switch (C0278-4) by a yellow/light green wire. Power flows through the wash/wipe switch (C0278-1) to the wiper motor (C0030-3) on a blue/light green wire. The wiper motor (C0030-1) is earthed on a black wire. The wipers operate until their park position is reached. The park switch then opens, cutting the power supply to the wiper motor. Intermittent Wipe Moving the wash/wipe switch to the intermittent wipe position allows power to flow across the switch (C0278-3) to the windscreen wiper delay ECU (C0303-1) on a white/green wire. When this signal is received by the ECU, it switches the path to earth (C0303-4) on and off approximately every 5 seconds on a black wire. An intermittent feed is then supplied from the ECU (C0303-2) to the wash/wipe switch (C0278-4) on a yellow/light green wire. Power flows through the switch (C0278-1) and supplies the wiper motor (C0030-3) on a blue/light green wire. The wipers operate at slow speed. Programmed Wash Wipe Depressing the end of the wash/wipe switch operates the programmed wash/wipe function. When the switch is closed, power flows across the switch (C0278-2) to the windscreen wiper delay ECU (C0303-6) and the windscreen washer pump (C0008-2). Both are supplied a feed on light green/black wires. The washer pump (C0008-1) is earthed on a black wire.
DESCRIPTION AND OPERATION DEFENDER 1999 MY4.25 When the windscreen wiper delay ECU (C0303-6) receives a feed from the wash/wipe switch (C0278-2), it supplies a feed (C0303-2) back to the wash/wipe switch (C0278-4) on a yellow/light green wire. Power flows across the wash/wipe switch (C0278-1) and onto the wiper motor (C0030-3), which operates at slow speed. When the washer switch is released, the ECU will operate the wipers for a further 3 cycles. Once this has been completed, the feed to the wash/wipe switch is cut by the ECU and the park circuit is initiated. Rear Wiper The rear wiper switch (C1197-1) is supplied a feed by fuse 3 of the passenger compartment fuse box (C0580-6) on a white/green wire. When the switch is in the On position (C1194-1), power is fed to the rear screen wiper motor (C0388-2) on a red/light green wire. The wiper motor (C0388-1) is earthed on a black wire. Rear Park Circuit Positioning the rear wiper switch to the Off position cuts power to the rear wiper motor on the red/light green wire. The park circuit operates to return the wiper to its park position. The park switch (C1105-2) is integral with the wiper motor. It receives a feed from fuse 3 (C0580-6) of the passenger compartment fuse box on a white/green then green wire. The park switch is closed with the wiper in any position except its park position. With the park switch closed, power flows across the switch (C1105-1) to the rear wiper switch (C1195-1) on a brown/light green wire. Power flows across the wiper switch (C1194-1) back to the wiper motor (C0388-2) on a red/light green wire. The wiper motor (C0388-1) is earthed on a black wire. The wiper operates until the park position is reached, when the park switch opens, cutting the power supply to the motor. Rear Wash The rear washer switch (C1197-1) is supplied a feed by fuse 3 of the passenger compartment fuse box (C0580-6) on a white/green wire. When the switch is depressed, power is supplied (C1196-1) to the rear screen washer pump (C0021-2) on a black/light green wire. The washer pump (C0021-1) is earthed on a black wire.
DESCRIPTION AND OPERATION 4.26 DEFENDER 1999 MY EXTERIOR LAMPS - Brake and Reverse Lamps DESCRIPTION The brake lamps illuminate when the ignition switch is in position II and the brake pedal is depressed. The reverse lamps illuminate when the ignition switch is in position II and the gear selector lever is in the reverse position. OPERATION Feed from the battery positive terminal is connected to fusible link 5 of the engine compartment fuse box (C0632-1) by a brown wire. Current passes through fusible link 5 (C0570-2) which supplies a feed to the ignition switch (C0028-1) on a brown/white wire. When the ignition switch is in position II (C0094-1), current flow across the switch to fuse 6 of the passenger compartment fuse box (C0580-9) on a white wire. Fuse 6 (C0580-12) supplies a feed to both the brake pedal switch (C0075-1) and the reverse lamp switch (C0167-1) on green/yellow wires. Brake Lamps When the brake pedal is depressed, the brake pedal switch closes and current flows across the switch. The brake pedal switch (C0029-1) supplies a feed on a green/purple wire to; ·The centre high mounted stop lamp (CHMSL) (C0832-1). ·The trailer pick-up (C0499-6). ·The LH tail lamp (C121-2). ·The RH tail lamp (C125-2). ·On Td5 engined vehicles, the ECM (C0638-16), to help control fuelling. The lamps and the trailer pick-up are earthed on black wires. Reverse Lamps When reverse gear is selected, the reverse lamp switch is closed. Current flows across the switch (C0167-2) to the LH reverse lamp (C0472-2) and the RH reverse lamp (C0455-2) on green/brown wires. The LH reverse (C0472-1) and the RH reverse lamp (C0455-1) are earthed on black wires.