Discovery II (LT) V8-4.6L (2003)
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Anti-Theft System
The BCU controls the logical switching operations for enabling and activating the anti-theft system. Features include:
-Perimetric protection - monitors the condition of doors and hinged panels.
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Volumetric protection - monitors the vehicle's interior space.
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Remote locking, superlocking and unlocking functions.
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Engine immobilisation and remobilisation.
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Advanced mislock detection and automatic compensation.
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EKA code functions.
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Customer configuration options.
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Market configuration options.
Immobilisation
The immobilisation system comprises the following components:
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RF receiver.
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RF transmitter/transponder.
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Transponder coil.
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BCU.
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Door switches, door lock switches and bonnet switch.
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IDM.
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ECM.
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Starter solenoid relay.
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Status LED.
Alarm system
The alarm system comprises the following components:
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RF receiver.
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RF transmitter.
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BCU.
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IDM.
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Door switches, door lock switches and bonnet switch.
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Battery backed-up sounder (BBUS).
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Status LED.
On non NAS vehicles, power supply for the alarm sounder and the battery BBUS is provided through two relays in the passenger compartment fuse
box. Each of the coils of the alarm relays are directly connected to the IDM which controls their operation under the direction of BCU signals received
via the serial data bus.
On NAS vehicles, an audible warning is provided through operation of the vehicle horns. The BCU provides an earth path for the coil of the horn
relay to initiate vehicle horn operation.
Central Door Locking (CDL)
The BCU carries out the logic control operation for CDL. A CDL switch is mounted on the fascia panel and has two inputs to the BCU, one for lock
and one for unlock.
