Land Rover Freelander 2003my Electrical Library Rover Manual
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DESCRIPTION AND OPERATION 4.26FREELANDER 03MY FOLDING DOOR MIRRORS DESCRIPTION General Certain markets are fitted with folding door mirrors. When the centre of the multi-directional mirror switch is pressed, both door mirrors move to the folded position simultaneously. Pressing the switch a second time returns the mirrors to their original position. For more information on door mirror operation, refer to the Door Mirrors section of this manual. + DOOR MIRRORS. OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 3 and fusible link 4 of the passenger compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) provides a feed to the window lift relay and fuse 14 of the passenger compartment fuse box (C0587) on an NW wire. Fusible link 4 (C0574) also provides a feed to the CCU (C0592) on an NW wire. Folding Mirror ECU Fuse 14 of the passenger compartment fuse box (C0583) provides a constant battery feed to the folding mirror ECU (C0907) on a P then NS wire. The folding mirror ECU is located at the base of the passenger side A post, and is earthed on a B wire. The folding mirror ECU (C0907) monitors the condition of the door mirror switch (C0066) on a UB wire. When the switch is pressed, a momentary earth path is created on a B wire via the door mirror switch (C0066) and the passenger compartment fuse box (C0589 & C0587) on a B wire. When the folding mirror ECU senses this earth, it powers both folding mirror motors.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.27 Door Mirrors When the folding mirror ECU senses the door mirror switch has been pressed, it provides a feed to the LH folding mirror motor (C0444) on a Y then R wire, and the RH folding mirror motor (C0444) on a Y then B wire. Current flows across the motors (C0444) and back to the folding mirror ECU on a B then O wire (LH) and an R then O wire (RH). When the folding mirror ECU senses the door mirror switch has been pressed for a second time, it provides a feed to the LH folding mirror motor (C0444) on an O then B wire, and the RH folding mirror motor (C0444) on an O then R wire. Current flows across the motors (C0444) and back to the folding mirror ECU on an R then Y wire (LH) and a B then Y wire (RH). NOTE: The LH and RH door mirrors have the same connector numbers as they utilise the same harness.
DESCRIPTION AND OPERATION 4.28FREELANDER 03MY HEATED SEATS DESCRIPTION General The heated front seats are switched on and off by pressing either of the switches mounted on the centre console. The heated front seats are operated independently of each other. The switches also incorporate an illumination LED to show when the seat heaters are switched on. 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) is connected to the auxiliary relay (C0587) by an NW wire. The earth path for the relay coil is controlled by the Central Control Unit (CCU) (C0592), 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 an OG wire. Fuse 8 provides an ignition feed to the CCU, which is mounted directly onto the rear of the passenger compartment fuse box. When the CCU receives an ignition feed, it energises the auxiliary relay by providing an earth path for the relay coil. The energised auxiliary relay provides a feed to fuse 29, which is also located in the passenger compartment fuse box. Fuse 29 (C0584) provides a feed to the LH heated seat switch (C0249) and the RH heated seat switch (C0250) on N wires. LH Seat When the LH heated seat switch is pressed, current flows across the switch contacts (C0249) to the LH heated seat relay (C1221) on a US then R wire. Operation of the heated seat relay (C1221) is controlled by the temperature sensor on a G wire. The temperature sensor is a normally closed switch. Current flows across the switch to earth on a G then N then B wire. When the temperature of the seat is within acceptable levels, the heated seat relay (C1221) provides a feed to the seat heater elements on an RW wire. The elements are wired in series and earthed on an N then B wire. If the temperature sensor detects the temperature of the seat is too high, it cuts the earth path for the heated seat relay. This de-energises the relay until seat heat temperature decreases to acceptable levels.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.29 RH Seat When the RH heated seat switch is pressed, current flows across the switch contacts (C0250) to the RH heated seat relay (C1221) on a UK then R wire. Operation of the heated seat relay (C1221) is controlled by the temperature sensor on a G wire. The temperature sensor is a normally closed switch. Current flows across the switch to earth on a G then N then B wire. When the temperature of the seat is within acceptable levels, the heated seat relay (C1221) provides a feed to the seat heater elements on an RW wire. The elements are wired in series and earthed on an N then B wire. If the temperature sensor detects the temperature of the seat is too high, it cuts the earth path for the heated seat relay. This de-energises the relay until seat heat temperature decreases to acceptable levels.
DESCRIPTION AND OPERATION 4.30FREELANDER 03MY DIAGNOSTIC SOCKET DESCRIPTION General The diagnostic socket is located behind the centre console, and is accessible from the drivers footwell on NAS vehicles, or the passenger footwell on all other vehicle derivatives. The socket is compliant with SAE directive J1962 standard, and allows attachment of TestBook, T4, or any other suitable diagnostic software tool. It allows detailed fault diagnosis checks to be carried out on the vehicle via an ISO 9141 K Line. OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) is connected to fuse 14 of the passenger compartment fuse box (C0587) by an NW wire. Fuse 14 (C0583) provides a constant battery feed to the diagnostic socket (C0040) on a P wire. The diagnostic socket is earthed on a pair of B wires. The diagnostic socket (C0040) communicates with the following systems and components via the K line on K wires: zThe instrument pack (C0230). zThe Central Control Unit (CCU) (C0429). zThe ABS ECU (C0501). zThe SRS DCU (C0256). zThe cruise control ECU (KV6 ROW vehicles only) (C0239). zThe Electronic Automatic Transmission Electronic Control Unit (EAT ECU) (Td4 and KV6 vehicles only) (C0932). zThe Engine Control Module (ECM) (KV6 NAS vehicles only) (C0331). zThe Engine Control Module (ECM) (KV6 ROW vehicles only) (C0371). zThe ECM (K1.8 vehicles only) (C0913). zThe ECM (Td4 vehicles only) (C0603). zThe Fuel Burning Heater (FBH) (Td4 vehicles only) (C0925). The diagnostic socket (C0040) also communicates with the immobilisation ECU (C0059) via the DS-2 bus on a K wire.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.31 CENTRAL CONTROL UNIT (CCU) DESCRIPTION General For a full description of the CCU, refer to the Control Units section of the System Description and Operation Workshop manual. OPERATION General For a full description of CCU operation, refer to the Control Units section of the System Description and Operation Workshop manual. NOTE: The CCU is mounted directly onto the rear of the passenger compartment fuse box. As there is no harness connecting the passenger compartment fuse box to the CCU, connectors C0592 and C0593 are not shown in the Connector section of this manual. For details on these connectors, refer to the Control Units section of the System Description and Operation Workshop manual.
DESCRIPTION AND OPERATION 4.32FREELANDER 03MY CHARGING AND STARTING – Td4 DESCRIPTION Starting The starting system on the vehicle comprises a 12 volt starter motor which drives the engine to start the combustion process. The starter converts electrical energy into mechanical power. The vehicle electrical system must be capable of supplying sufficient power to enable the engine to be cranked. Charging The charging system comprises a battery and an alternator. The battery must be of a sufficient capacity to operate the starter motor and operate various electrical systems in the vehicle. The alternator charges the battery when the engine is running and increases its output as demand on the battery increases. The instrument pack incorporates a charge warning lamp which illuminates when there is no output or a low output from the alternator. For a detailed description of the charging and starting system, refer to the Engine Management Systems – EDC section of the System Description and Operation Workshop manual. OPERATION General Feed from the positive battery terminal (C0192) is supplied to the main relay, fusible link 1, fusible link 3, fusible link 6, and fuse 10 (C0632) on an R wire. All are located in the engine compartment fuse box. The battery (C0192) also supplies a constant feed to the starter motor solenoid (C0631) on an R wire. Fusible link 1 is connected in series with fusible link 7, 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 6, fuse 8, and fuse 19 of the passenger compartment fuse box (C0588) on a G wire. When the ignition switch is turned to the crank position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.33 Starting Main Relay The earth path for the main relay coil (C0576) is controlled by the Engine Control Module (ECM) (C0603) on a WK wire. The energised main relay provides a feed to fuse 1 which is also located in the engine compartment fuse box. Fuse 1 (C0576) provides a feed to the glow plug relay (C0215) on an RW wire. For a detailed description of main relay operation, refer to the Engine Management Systems – EDC section of the System Description and Operation Workshop manual. Inertia Switch Fuse 10 of the engine compartment fuse box (C0575) provides a constant battery feed to the inertia switch (C0123) on a G wire. The inertia switch is a normally closed switch. If the inertia switch hasnt been tripped, current flows across the switch (C0123) to the fuel pump relay (C0575) on a GU wire. The inertia switch (C0123) also provides a feed to the Central Control Unit (CCU) (C0428) on a GU wire. For more information on the CCU, refer to the Control Units section of the Workshop manual, and the Anti-theft Alarm and Central Door Locking (CDL) section of this manual. + ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL). Fuel Pump Relay The fuel pump relay coil receives a feed from the energised main relay. The earth path for the relay coil (C0575) is controlled by the ECM (C0331) on a BP wire. The ECM will energise the fuel pump relay when it receives an ignition feed from fuse 6 of the passeneger compartment fusebox (C0581) on a W wire. The energised fuel pump relay (C0572) provides a feed to the fuel pump (C0205) on a WP wire. The fuel pump (C0205) is earthed on a B wire.
DESCRIPTION AND OPERATION 4.34FREELANDER 03MY Glow Plug Relay Fuse 6 of the passenger compartment fuse box (C0581) provides an ignition feed to the ECM (C0603) on a W wire. If all criteria are met, the ECM (C0606) provides an earth path for the glow plug relay coil (C0215) on a BR wire. Fusible link 6 of the engine compartment fuse box (C0577) provides a constant battery feed to the glow plug relay switch (C0215) on an NW wire. When the relay is energised, the switch contacts close, allowing the glow plug relay to provide a feed to the following: zTo glow plug number 1 (C0476) on a BG wire. zTo glow plug number 2 (C0477) on a BP wire. zTo glow plug number 3 (C0478) on a BY wire. zTo glow plug number 4 (C0479) on a BR wire. For more details of glow plug operation, refer to the Engine Management Systems – EDC section of the Workshop manual. Starter Relay Fuse 5 of the passenger compartment fuse box (C0581) provides an ignition switch crank feed to the immobilisation ECU (C0059) on a WR wire. If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter relay coil (C0576) on an RW wire. The starter relay is located in the engine compartment fuse box, and is earthed (C0576) on a B wire. A battery feed from fusible link 7 is now able to flow across the starter relay switch contacts (C0572) to the starter motor solenoid (C0178) on an NR then B wire. For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual. + ENGINE IMMOBILISATION. Starter Motor and Starter Motor Solenoid The starter motor solenoid coil (C0178) receives a feed from the energised starter motor relay (C0572) on an NR then B wire (see above). The energised starter motor solenoid allows a battery feed (C0178) to flow across the switch contacts and power the starter motor.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.35 Central Control Unit (CCU) The CCU (C0428) receives a feed from the inertia switch (C0123) on a GU wire. If this feed is removed due to the inertia switch being tripped, the CCU will unlock all of the doors. For more details of CCU operation, refer to the Control Units section of the Workshop manual. For more details of the Central Door Locking (CDL) system, refer to the Anti-theft Alarm and Central Door Locking (CDL) section of this manual. + ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL). NOTE: The CCU will only unlock all doors if the ignition switch is in the ignition position. The CCU (C0429) also provides a signal feed to the immobilisation ECU (C0059) on a KN wire. This signal feed informs the immobilisation ECU to energise the starter relay. For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual. + ENGINE IMMOBILISATION. Charging Alternator The battery (C0192) provides a permanent feed to the alternator (C0183) via the starter motor (C0631) on an R then N wire. Fuse 19 of the passenger compartment fuse box (C0581) provides an ignition feed to the alternator (C0226) on a W then GN wire. When the engine is turned over, the alternator (C0226) supplies the ECM (C0606) a Pulse Width Modulated (PWM) signal on a U wire. The ECM uses this PWM signal to calculate the electrical load on the alternator, and controls engine idle speed accordingly. When the engine is started, the magnetised rotor within the stator windings generate 3 phase alternating current (ac) and voltage that rises rapidly with rotor speed. The field diodes in the rectifier pack convert the ac current into direct current (dc). Output current from the field diodes supplements the initial current flowing through the field windings. This causes an increase in the magnetic influence of the rotor, resulting in self-exitation of the alternator. The field current increases with rotor speed and thus increases the generated current and voltage until the alternator is fully excited. The alternator (C0183) charges the battery (C0192) by providing current on an N then R wire. Ignition/No charge Warning Lamp Fuse 8 of the passenger compartment fuse box (C0589) provides an ignition feed to the ignition/no charge warning lamp (C0233) on a G wire. Illumination of the warning lamp (C0233) is controlled by the ECM (C0331) on an NY wire.