Land Rover Body And Paint Air Bag And Safety Belt Rover Manual
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Diagnostic socket3 Integrated Head Unit (IHU) or Head unit4 Heating and ventilation control module5 Fuel burning heater6 Seat occupancy sensor (NAS only)7 Restraints control module8 Terrain Response™9 Electronic rear differential control module10 Electric park brake control module11 Air suspension control module12 Communications NetworkLesson 2 – Electrical 197Technical Training (G421292)
Communication Network (CAN bus) Sheet 3 of 3 NOTE: D= HS CAN Bus N= MS CAN Bus O= LIN Bus Engine Control Module1Tyre pressure monitoring control module2 (G421292) Technical Training198 Lesson 2 – ElectricalCommunications Network
Park Distance Control (PDC) module3 Central Junction Box (CJB)4 Rain senor5 Memory control module6 Sunroof control module7 Battery backed up sounder (BBuS)8 ABS control module9 Automatic Front Lighting System (AFS)10 Transfer box control module11 Transmission control module12 A number of different types of data bus are incorporated into the vehicle wiring harnesses for the transmission of commands and information between ECU’s. The bus configuration installed on a particular vehicle depends on the model and equipment level. The available types of bus systems on the vehicle are: •High speed Controller Area Network (CAN) bus •Medium speed CAN bus •Media Orientated System Transport (MOST) bus •Gigabit Video Interface (GVIF) •Local Interconnect (LIN) bus •Security Local Interconnect (SLIN) bus ProtocolBaud rateBus 11898500 kbits/sHigh speed CAN 11898125 kbits/sMedium speed CAN MOST Cooperation24 MbsMOST Sony proprietary system1.95 GbpsGVIF LIN consortium9.6KbsLIN Controller Area Network (CAN) The CAN bus is a high speed broadcast network where the ECU’s automatically transmit information on the bus every few microseconds. The other buses are low speed networks which are mainly event driven, i.e. an electronic control module outputs a message only in response to a request message from another ECU or a hard wired input from a switch or sensor. A twisted pair of wires are used for the CAN bus and single wires are used for all of the other buses. Bus wires can be repaired using crimped connections. The unwound length of CAN bus wires must not exceed 40 mm (1.6 in). Two CAN busses are employed on the vehicle: •Medium speed •High speed The medium speed bus connects the following control modules: •Integrated Head Unit (IHU) or low line head unit •Heating and ventilation control module •Fuel burning heater •Park distance control •Tyre pressure monitoring control module •Central junction box The high speed bus connects the following control modules: Communications NetworkLesson 2 – Electrical 199Technical Training (G421292)
•Steering angle sensor •Air suspension •Electric park brake •Electronic rear differential control module •Terrain Response™ •Restraint control module •Engine control module •Transmission control module •Adaptive front lighting system control module •Antilock Braking System (ABS) control module Both the medium and high speed CAN bus are connected to the Instrument cluster and the diagnostic socket at one end. The Medium speed bus terminates at the Central Junction Box (CJB), while the high speed bus terminates at the ABS control module. Control modules are connected in either a loop , CAN in/ CAN out, or a spur configuration. Should a control module that is looped fail that bus system will fail at that point. Should a spurred control module fail the rest of the bus system will be unaffected by the faulty control module. Media Orientated System Transport (MOST) The MOST bus uses a fibre optic cable to transport data and audio around the entertainment and information system. The fibre optic cable is arranged in a ring, with each unit on the bus having a MOST in and MOST out. MOST is a synchronous network. A timing master supplies the clock and all other devices synchronize their operation to this clock. The timing master for the MOST network is the integrated head unit (IHU). Key features of the MOST network are: •Simple connectors •Reduced cabling •Support of asynchronous and synchronous data transfer •Support for up to 64 devices •High data transfer rate When handling the MOST fibre optic cables the following safety precautions should be observed: •The cable has a minimum bend radius of 25mm. •It is advisable not to look directly into the connector of a live cable. •The MOST cable cannot be repaired, replacement overlay harnesses will be available to replace damaged cables. Gigabit Video Interface (GVIF) The GVIF bus is a Sony proprietary bus for the transmission of video between a transmitter device and a display device. In this instance it is used to transmit video from the navigation computer to the Touch Screen Display (TSD) only. Local Interconnect (LIN) bus There are two LIN buses on the vehicle. One connects the Rain sensor, Sunroof and Memory seats to the central junction box and the other connects the BBUS to the central junction box. The LIN bus has a master/ slave configuration. Within the master is stored a schedule table which is a list of all the LIN frames or packets in order of which one gets sent when and how many times within a particular cycle. The Master sends out a header on the bus which will identify to the slaves whose turn it is to transmit a frame. The slave then fills the space after the header with the contents of the frame. The frame identifiers are all sourced from the LIN specification, and the frame identifiers are grouped by the size of the frame in bytes. All the LIN nodes are optional fit, consequently there is a different schedule table for each permutation and the Bus master switches between these based on the information held within the car configuration file. The (G421292) Technical Training200 Lesson 2 – ElectricalCommunications Network
CJB also acts as a bi-directional gateway between the MS-CAN bus and the LIN bus by passing signals between the two buses. The bus is a single wire and operates at 9.6Kbs. The protocol used on the LIN bus is defined by the LIN consortium. Diagnostic Socket The diagnostic socket allows the transfer of information between the vehicle Electronic Control Modules and T4 on the high or medium speed CAN bus, or indirectly via the instrument pack. The diagnostic socket is located in the lower instrument panel closing panel, on the drivers side below the steering column. Communications NetworkLesson 2 – Electrical 201Technical Training (G421292)
COMPONENT LOCATIONS Pollution sensor (Japan only)1 Sunlight sensor2 ATCM3 Evaporator temperature sensor4 Control ComponentsLesson 2 – Electrical 37Technical Training (G421238)
In-vehicle temperature sensor; In-vehicle temperature and humidity sensor (Japan only) 5Refrigerant pressure sensor6 Ambient air temperature sensor7 GENERAL The control system operates the Air Conditioning (A/C) system and the heating and ventilation system to control the temperature, volume and distribution of air from the heater. Either a manual or an automatic control system is installed in the vehicle. The manual system maintains a constant heater outlet temperature, to both sides of the passenger compartment, with manual control of the intake air source, blower speed and air distribution. The automatic system automatically adjusts the temperature, volume and distribution of the air from the heater to maintain the individual temperature levels selected for the LH and RH sides of the passenger compartment. The automatic system also has manual overrides for the intake air source, blower speed and air distribution. The manual and automatic systems both include: •An Automatic Temperature Control Module (ATCM). •An ambient temperature sensor. •A refrigerant pressure sensor. •An evaporator temperature sensor. The automatic system incorporates the following additional components: •An in-vehicle temperature sensor. •A sunlight sensor. The automatic system in the Japan market also incorporates: •A pollution sensor. •A humidity sensor. ATCM The ATCM is installed in the center console. An integral control panel contains push switches and rotary switches for system control inputs. LEDs in the switches and switch surrounds illuminate to indicate the current settings of the system. Switch symbols are illuminated when the side lamps or headlamps are on. The ATCM processes inputs from the control panel switches, system sensors and the medium speed Controller AREA Network (CAN) bus, then outputs the appropriate control signals to the A/C system and the heating and ventilation system. In addition to controlling the A/C system and the heating and ventilation system, the ATCM also controls the following: •The front seat heaters. •The rear window heater. •The windshield heater. •The windshield washer jet and exterior mirror heaters. (G421238) Technical Training38 Lesson 2 – ElectricalControl Components
Manual System Control Panel Temperature switch1 LH front seat heater switch2 Distribution switch3 RH front seat heater switch4 Blower switch5 Rear window heater switch (models with heated windshield) 6 Rear window heater switch (models without heated windshield) 7 Windshield heater switch (where fitted)8 Economy switch9 Recirculation switch10 The switches on the manual ATCM control panel have the following functions: •Temperature Switch: Adjusts the heater temperature output. The switch can rotate through 240°, from full cold to full hot. Minor detents define small steps of the switch. Amber LEDs in the switch surround illuminate to indicate the temperature setting. •LH and RH Seat Heater Switches: Activates the heater elements in the seat cushion and seat back at one of two heat levels. The first press of the switch energizes the heater elements at the higher heat setting and illuminates two amber LEDs in the switch. A second press of the switch sets the heater elements to the lower heat setting and extinguishes one of the LEDs. A further press of the switch Control ComponentsLesson 2 – Electrical 39Technical Training (G421238)
de-energizes the heater elements and extinguishes the second LED. The seat heaters remain on until selected off or the ignition is switched off. •Distribution Control Switch: For manual adjustment of air distribution. The switch can rotate through 360°. 12 primary detents define the distribution settings of: Face only; 3 face/feet; feet only; 3 feet/screen; screen only; 3 screen/face. Minor detents define small steps between the primary detents. Amber LEDs in the switch surround illuminate to indicate the distribution setting. •Blower Switch: For manual adjustment of blower speed. The switch can rotate through 240°, from off to maximum speed. Eight primary detents define the off position and seven blower speeds. Minor detents define small steps between the primary detents. Amber LEDs in the switch surround illuminate to indicate the selected blower speed. •Rear Window Heater Switch: Enabled only with the engine running. Pressing the switch energizes the rear window heater for a set time period, until the switch is pressed again, or until the engine stops, whichever occurs first. An amber LED in the switch is illuminated while the heater is on. •Windshield Heater Switch: Enabled only with the engine running. Pressing the switch energizes the windshield heater for a set time period, until the switch is pressed again, or until the engine stops, whichever occurs first. An amber LED in the switch is illuminated while the heater is on. •Economy Switch: Reduces the A/C compressor output to a minimum displacement condition x 5%, reducing the engine load required to operate the system. An amber LED in the switch is illuminated when the economy mode is selected on. •Recirculation Switch: For selection of fresh or recirculated air. An amber LED in the switch is illuminated when recirculated air is selected. (G421238) Technical Training40 Lesson 2 – ElectricalControl Components
Automatic System Control Panel LH temperature switch1 LH front seat heater switch2 Blower switch3 Automatic mode switch4 RH front seat heater switch5 RH temperature switch6 Programmed defrost switch7 Windshield heater switch8 Rear window heater switch9 Auxiliary climate control switch10 System off switch11 Economy switch12 Recirculation switch (models without pollution sensing) 13 Recirculation switch (models with pollution sensing) 14 Distribution switch - feet15 Distribution switch - face16 Distribution switch - windshield17 The switches on the automatic ATCM control panel have the following functions: •LH and RH Temperature Switches: Adjusts the nominal temperature settings of the LH and RH sides of the passenger compartment. The switch can rotate through 270°, between full cold and full hot. The switch surrounds are graduated in 2° increments between 16 and 28 °C. Minor detents define 1 °C steps over the range of the switch. Amber LEDs in the switch surround illuminate to indicate the temperature setting. When maximum cold is selected, Control ComponentsLesson 2 – Electrical 41Technical Training (G421238)