Freelander System Description and Operation
SECURITY
DESCRIPTION AND OPERATION 86-5-13
Description
General
The immobilisation system is essentially a stand alone system with its own controlling ECU located centrally behind
the fascia.
On late 2003 model year vehicles (from VIN 242164 onwards), the EWS3-D immobilisation system was replaced. A
new system was introduced which improved the process for adding or replacing keys, allowing the dealer to enable
new keys using TestBook/T4. Apart from the immobilisation ECU, the system retains similar components and
functionality of the previous immobilisation system. The system is not available as a replacement for vehicles fitted
with an EWS3–D system.
Immobilisation System
The immobilisation system comprises:
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Immobilisation ECU
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Ignition switch transponder coil (Ring antenna)
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Key transponder
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Ignition switch
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Instrument pack
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Engine Control Module (ECM)
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Central Control Unit (CCU)
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Park/neutral switch
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Starter motor
Immobilisation System - General
The function of the immobilisation system is to prevent unauthorised starting of the vehicle. The ECU operates in a
secure interface which cannot be by-passed or copied. Re-mobilisation is achieved through a transponder in the
vehicle key which is energised by a transponder coil surrounding the ignition switch when the ignition is turned to 'AUX'
position I. When energised, the transponder data is read by the immobilisation ECU which will confirm the validity of
the start request.
Ignition Switch Transponder Coil