Land Rover Freelander 2004my Electrical Library Rover Manual
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DESCRIPTION AND OPERATION 4.72FREELANDER 04MY SUPPLEMENTARY RESTRAINT SYSTEM (SRS) DESCRIPTION General The Supplementary Restraint System (SRS) is designed to work in conjunction with the vehicle seat belts. The main components of the system are: zDriver Airbag – Mounted in the steering wheel to provide added protection for the driver during a frontal impact. zPassenger airbag – Mounted in the fascia to provide added protection for the front seat passenger during a frontal impact. zSeat Belt Pre-tensioners – Mounted on the inner edge of both front seats within the seat belt anchorage, to provide added protection during a front impact. zAirbag Diagnostic Control Unit (DCU) – Mounted beneath the centre console, and used detect crash conditions and control the SRS system. zSRS LED – Mounted in the instrument pack, the LED acts as an indicator of system status. NOTE: The airbag DCU illuminates the SRS LED for 5 seconds when the ignition switch is turned to the ignition position to inform the driver the SRS LED is functioning correctly. WARNING: Before starting work on the SRS system, refer to the safety precautions contained within the Workshop manual. For a detailed description of the SRS system and safety precautions to carry out before starting work, refer to the System Description and Operation Workshop manual. 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 18, and fuse 23 of the passenger compartment fuse box (C0588) on a G wire. Fuse 23 (C0580) provides an ignition feed to the airbag DCU (C0256) on a G wire. The DCU (C0256) is earthed on a B wire. Fuse 18 (C0589) provides an ignition feed to the SRS LED (C0233) on a G wire. Driver Airbag The airbag DCU (C0256) controls the feed to the driver airbag (C0545) via the rotary coupler (C0374) on a Y wire. The airbag DCU (C0256) controls the earth path for the driver airbag (C0545) via the rotary coupler (C0374) on an R wire.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.73 Passenger Airbag The airbag DCU (C0256) controls the feed to the passenger airbag (C0433) on a W wire. The earth path for the passenger airbag (C0433) is controlled by the airbag DCU (C0256) on a U wire. Seat Belt Pre-tensioners RH The airbag DCU (C0256) controls the feed to the RH pre-tensioner (C0254) on an N wire. The earth path for the RH pre-tensioner (C0254) is controlled by the airbag DCU (C0256) on an NR wire. LH The airbag DCU (C0256) controls the feed to the LH pre-tensioner (C0252) on an O wire. The earth path for the LH pre-tensioner (C0252) is controlled by the airbag DCU (C0256) on an OU wire. SRS LED Fuse 18 of the passenger compartment fuse box (C0589) provides an ignition feed to the SRS LED (C0233) on a G wire. To illuminate the LED (C0233), an earth path is provided on a YR wire via the airbag DCU (C0256). To extinguish the LED, the airbag DCU withdraws the earth path. Diagnostic Socket The SRS system can be interrogated using TestBook or T4 via the diagnostic socket. The diagnostic socket (C0040) is connected to the airbag DCU (C0256) by a K wire.
DESCRIPTION AND OPERATION 4.74FREELANDER 04MY AIR CONDITIONING (A/C) – Td4 DESCRIPTION General The air conditioning (A/C) system will only operate when the engine is running. The A/C system is switched on and off by pressing the switch mounted on the centre console. When the switch is pressed, an LED mounted within the switch illuminates to inform the driver the system is operational. For more information on LED operation, refer to the Interior Illumination section of this manual. + INTERIOR ILLUMINATION. The position of the rotary heater control determines the amount of warm air from the heater matrix blended with cool air from the A/C evaporator, and hence the temperature of the air output from the heater ducts. NOTE: The blower switch must be in at least position 1 for the A/C system to operate. The A/C system is automatically switched on when either the screen or screen/feet positions are selected via the rotary distribution control knob. NOTE: The A/C LED will not illuminate under these conditions. For more information on heater operation, refer to the Heater Blower section of this manual. + HEATER BLOWER. OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 5, fusible link 1 and the main relay (C0632) on an R wire. All are located within the engine compartment fuse box. 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 4, which is also located in the engine compartment fuse box. For more details on main relay operation, refer to the Engine Management Systems – EDC section of the System Description and Operation Workshop manual. Fusible link 1 is connected in series with fusible link 2, fuse 8, and fuse 9 which are also located in the engine compartment fuse box. Fuse 8 (C0576) provides a constant battery feed to the heater blower relay (C0153) on a GN then GW wire. Fuse 9 provides a constant battery feed to the compressor clutch relay, which is also located in the engine compartment fuse box.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.75 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 (C0585) provides an ignition feed to the following on G then LGS wires: zThe blower motor switch (C0058). zThe fresh/recirculated air switch (C0750). zThe fresh/recirculated air motor (C0006). A/C Master Switch When the blower switch (C0058) is turned to position 1 or higher, it provides a feed to the A/ C master switch (C0275) and the A/C microswitch (C2575) on SW then B wires. If A/C is requested, the switch (C0275) provides a feed to the instrument pack (C0233) via the microswitch (C2575) on a B then SK wire. When the instrument pack receives an A/C request from the switch, it informs the ECM (C0331) via the CAN BUS on YN (Low) and YB (High) wires. The A/C master switch is mounted on the centre console, and is earthed (C0275) on a B wire. For more information on the CAN BUS, refer to the Communication Databuses section of the System Description and Operation Workshop manual. A/C Microswitch The A/C microswitch (C2575) is mounted on the rear of the heater distribution control knob, and switches the A/C on automatically when the screen or feet/screen position is selected. In this instance, the switch contacts close, allowing the blower motor switch (C0058) to provide a feed to the instrument pack (C0233) on an SW then SK wire, by-passing the A/C master switch. Compressor When the ECM (C0331) receives an A/C request signal via the CAN BUS, it will energise the A/C compressor clutch relay by providing an earth path for the relay coil (C0576) on a UB wire. A feed from fuse 9 of the engine compartment fuse box is now able to flow across the energised relay (C0575) to the compressor clutch (C0127) on an R wire.
DESCRIPTION AND OPERATION 4.76FREELANDER 04MY Instrument Pack The instrument pack (C0230) acts as a gateway, relaying CAN messages to and from different components throughout the vehicle as follows: Pressure Sensor The pressure sensor is located in the high pressure A/C line adjacent the compressor, and replaces the more traditional trinary pressure switch. The instrument pack (C0230) provides a 5 V reference voltage to the pressure sensor (C1257) on a UO wire. The pressure sensor (C1257) is provided an earth path via the instrument pack (C0230) on a PB wire. The pressure sensor (C1257) provides the instrument pack (C0230) a signal feed on a UG wire. The value of this signal feed is dependent upon the pressure within the A/C system. This signal is relayed by the instrument pack (C0230) to the ECM (C0331) via the CAN-BUS on YB (High) and YN (Low) wires. The ECM uses this signal to determine the pressure within the A/C system, enabling it to carry out the following tasks: zTo provide a safety cut-out function if the pressure within the A/C system goes either too high or too low. zTo control the speed of the cooling and condenser fans via the cooling fan ECU. zTo help control engine idle speed. Evaporator Temperature Sensor The evaporator temperature sensor is used to ensure the evaporator doesnt freeze. The instrument pack (C0230) provides a feed to the evaporator temperature sensor (C0417) on a GO wire. The sensor (C0417) is earthed on a B wire. The instrument pack relays the temperature reading to the ECM (C0331) via the CAN BUS on YB (High) and YN (Low) wires. NOTE: The ECM also uses the evaporator temperature sensor signal in conjunction with the pressure sensor signal to help control engine idle speed. For more information on CAN messages, refer to the Communication Databuses section of the System Description and Operation Workshop manual. Cooling Fan Control Unit Fusible link 5 of the engine compartment fuse box (C0573) provides a constant battery feed to the cooling fan control unit (C0208) on an NG wire. Fuse 4 of the engine compartment fuse box (C0575) provides a feed to the cooling control unit (C1680) on an NK wire when the main relay is energised (see above). The cooling control unit (C0208) is earthed on a B wire. To control cooling fan and condenser fan speed, the ECM (C0331) provides the cooling fan control unit (C1680) a Pulse Width Modulated (PWM) signal on a UW wire. The frequency of the pulses supplied by the ECM determines the speed the cooling fan control unit will drive the cooling fan and condenser fan motors.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.77 The cooling fan control unit interprets the PWM signal provided by the ECM as follows: zIf a PWM signal of between approximately 12 % and 87 % is received by the cooling fan control unit, it will not power the cooling fans. zIf a PWM signal of 87 % or over is received by the cooling fan control unit, it will provide a feed to the cooling fan (C0005) and condenser fan motors (C0280) on SU wires. An earth path is provided for the cooling fan (C0005) and condenser fan motors (C0280) by the cooling fan control unit (C2470) on a pair of PS wires. zIf a PWM signal of less than 12 % is received by the cooling fan control unit, it assumes a fault has occurred and powers the cooling and condenser fan motors as described above. zIf a continuous voltage is received by the cooling fan control unit, it assumes a fault has occurred and powers the cooling and condenser fan motors as described above. Fresh/Recirculated Air Fuse 4 of the passenger compartment fuse box (C0585) 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 A/C system 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 A/C system to use recirculated air. The switch is mounted on the centre console, adjacent the A/C master switch, and is earthed (C0750) on a B wire.
DESCRIPTION AND OPERATION 4.78FREELANDER 04MY AIR CONDITIONING (A/C) – K SERIES AND KV6 DESCRIPTION General The air conditioning (A/C) system will only operate when the engine is running. The A/C system is switched on and off by pressing the switch mounted on the centre console. When the switch is pressed, an LED mounted within the switch illuminates to inform the driver the system is operational. For more information on LED operation, refer to the Interior Illumination section of this manual. + INTERIOR ILLUMINATION. The position of the rotary heater control determines the amount of warm air from the heater matrix blended with cool air from the A/C evaporator, and hence the temperature of the air output from the heater ducts. NOTE: The blower switch must be in at least position 1 for the A/C system to operate. The A/C system is automatically switched on when either the screen or screen/feet positions are selected via the rotary distribution control knob. NOTE: The A/C LED will not illuminate under these conditions. For more information on heater operation, refer to the Heater Blower section of this manual. + HEATER BLOWER. OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 5, and the main relay (C0632) on an R wire. All are located within the engine compartment fuse box. The earth path for the main relay coil (C0576 on K Series vehicles, C0578 on KV6 vehicles) is controlled by the Engine Control Module (ECM) (C0913 on K Series vehicles, C0371 on KV6 vehicles) on a WK wire. The energised main relay provides a feed to fuse 4, which is also located in the engine compartment fuse box. For more details on main relay operation, refer to the Engine Management Systems – MEMS or Engine Management Systems – Siemens (All Except NAS) section of the System Description and Operation Workshop manual. Fusible link 1 is connected in series with fuse 8, fuse 9 and fusible link 2, which are also located in the engine compartment fuse box. Fuse 8 (C0576) provides a constant battery feed to the blower relay (C0153) on a GN then GW wire. Fuse 9 provides a constant battery feed to the compressor clutch relay, which is also located in the engine compartment fuse box.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.79 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 to fuse 4 of the passenger compartment fuse box (C0588) on an SU wire. Fuse 4 (C0585) provides an ignition feed to following on G then LGS wires: zThe blower motor switch (C0058). zThe fresh/recirculated air switch (C0750). zThe fresh/recirculated air motor (C0006). A/C Master Switch When the blower switch (C0058) is turned to position 1 or higher, it provides a feed to the A/ C master switch (C0275) and the A/C microswitch (C2575) on SW then B wires. If A/C is requested, the switch (C0275) provides a feed to the instrument pack (C0233) via the microswitch (C2575) on a B then SK wire. When the instrument pack receives an A/C request from the switch, it informs the ECM (C0913 K Series vehicles, C0371 on KV6 vehicles) via the CAN BUS on YN (Low) and YB (High) wires. The A/C master switch is mounted on the centre console, and is earthed (C0275) on a B wire. For more information on CAN BUS operation, refer to the Communication Databuses section of the System Description and Operation Workshop manual. A/C Microswitch The A/C microswitch (C2575) is mounted on the rear of the heater distribution control knob, and switches the A/C on automatically when the screen or feet/screen position is selected. In this instance the switch contacts close, allowing the blower motor switch (C0058) to provide a feed to the instrument pack (C0233) on an SW then SK wire, by-passing the A/C master switch. Compressor K1.8 When the ECM (C0913) receives an A/C request signal via the CAN BUS, it will energise the compressor clutch relay by providing an earth path for the relay coil (C0576) on a UB wire. A feed from fuse 9 of the engine compartment fuse box is now able to flow across the energised relay (C0578) to the compressor clutch (C0127) on an R wire. KV6 When the ECM (C0371) receives an A/C request signal via the CAN BUS, it will energise the compressor clutch relay by providing an earth path for the relay coil (C0578) on a BR wire. A feed from fuse 9 of the engine compartment fuse box is now able to flow across the energised relay (C0575) to the compressor clutch (C0127) on an R wire.
DESCRIPTION AND OPERATION 4.80FREELANDER 04MY Pressure Sensor The pressure sensor is located in the high pressure A/C line adjacent the compressor, and replaces the more traditional trinary pressure switch. The ECM (C0913 on K Series vehicles, C0371 on KV6 vehicles) provides a 5 V reference voltage to the pressure sensor (C1257) on a UO wire. The pressure sensor (C1257) is provided an earth path by the ECM (C0913 on K Series vehicles, C0371 on KV6 vehicles) on a PB wire. The pressure sensor (C1257) provides the ECM (C0913 on K Series vehicles, C0371 on KV6 vehicles) a signal feed on a UG wire. The value of this signal feed is dependent upon the pressure within the A/C system. The ECM uses this feed to determine the pressure within the A/C system, enabling it to carry out the following tasks: zTo provide a safety cut-out function if the pressure within the A/C system goes either too high or too low. zTo control the speed of the cooling and condenser fans via the cooling fan control unit. zTo help control engine idle speed. Evaporator Temperature Sensor The evaporator temperature sensor is used to ensure the evaporator doesnt freeze. The ECM (C0913 on K Series vehicles, C0371 on KV6 vehicles) provides a feed to the evaporator temperature sensor on a GO wire (GU on KV6 vehicles). The sensor is provided an earth path via the ECM (C0913 on K Series vehicles, C0371 on KV6 vehicles) on a BO wire (PB on KV6 vehicles). NOTE: The ECM also uses the evaporator temperature sensor signal in conjunction with the pressure sensor signal to help control engine idle speed. Cooling Fan Control Unit Fusible link 5 of the engine compartment fuse box (C0573) provides a constant battery feed to the cooling fan control unit (C0208) on an NG wire. Fuse 4 of the engine compartment fuse box (C0575) provides a feed to the cooling fan control unit (C1680) on an NK wire when the main relay in energised. The cooling fan control unit (C0208) is earthed on a B wire. To control cooling fan and condenser fan speed, the ECM (C0913 on K Series vehicles, C0371 on KV6 vehicles) provides the cooling fan control unit (C1680) a Pulse Width Modulated (PWM) signal on a UW wire (UR then UW on KV6 vehicles). The frequency of the pulses supplied by the ECM determines the speed the cooling fan control unit will drive the cooling fan and condenser fan motors.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.81 The cooling fan control interprets the PWM signal provided by the ECM as follows: zIf a PWM signal of between approximately 12 % and 87 % is received by the cooling fan control unit , it will not power the cooling fans. zIf a PWM signal of 87 % or over is received by the cooling fan control unit, it will provide a feed to the cooling fan (C0005) and condenser fan motors (C0280) on SU wires. An earth path is provided for the cooling fan (C0005) and condenser fan motors (C0280) by the cooling fan control unit (C2470) on a pair of PS wires. zIf a PWM signal of less than 12 % is received by the cooling fan control unit, it assumes a fault has occurred and powers the cooling and condenser fan motors as described above. zIf a continuous voltage is received by the cooling fan control unit, it assumes a fault has occurred and powers the cooling and condenser fan motors as described above. Fresh/Recirculated Air Fuse 4 of the passenger compartment fuse box (C0585) 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 A/C system 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 A/C system to use recirculated air. The switch is mounted on the centre console, adjacent the A/C master switch, and is earthed (C0750) on a B wire.