Range Rover Sport (LS) V8-4.4L (2009)
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Local Interconnect Network (LIN) bus
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Security Local Interconnect (SLIN) bus
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Ai Net
CAN (controller area network)
The CAN (controller area network) bus is a high speed broadcast network where the control modules 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 control module or a hard wired input from a switch or sensor.
A twisted pair of wires are used for the CAN (controller area network) 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 (controller area network) bus wires must not exceed 40 mm (1.6 in).
Two CAN (controller area network) busses are employed on the vehicle:
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Medium speed (MS)
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High speed (HS)
The medium speed bus connects the following control modules:
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Integrated Head Unit (IHU) or low line head unit
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Heating and ventilation control module
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Fuel fired booster heater
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Parking aid control module
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TPMS control module
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CJB (central junction box)
The high speed bus connects the following control modules:
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Steering angle sensor
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Air suspension
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Electric Park Brake (EPB) control module
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Electronic rear differential control module
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Terrain Response"
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RCM (restraints control module)
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ECM (engine control module)
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TCM (transmission control module)
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Adaptive Front lighting System (AFS) module
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ABS (anti-lock brake system) module.
Both the medium and high speed CAN (controller area network) bus are connected to the instrument cluster and the diagnostic socket at one end. The
medium speed bus terminates at the CJB (central junction box), while the high speed bus terminates at the ABS (anti-lock brake system) control module.
Control modules are connected in either a loop, CAN (controller area network) in/ CAN (controller area network) out, or a spur configuration. Should a
control module that is looped fail, the 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 connection.
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:
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High data transfer rate
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Support for up to 64 devices