DESCRIPTION AND OPERATION
RANGE ROVER 4.9
ENGINE IMMOBILISATION
DESCRIPTION
General
The function of the engine immobilisation system is to prevent unauthorised starting of the
vehicle. The system is controlled by an immobilisation ECU which is located beneath the
centre console, adjacent to the handbrake. Re-mobilisation is achieved via a transponder in
the vehicle key, which is read by a transponder coil when the ignition switch is turned to the
'auxiliary' position. The transponder coil is mounted around the ignition switch.
For a detailed description of the engine immobilisation system, refer to the Security section
of the Description and Operation Workshop Manual.
OPERATION
Td6
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 2, fuse 18, and fuse
53 of the passenger compartment fuse box (C0632) on an R wire. Fuse 18 (C0584) provides
a constant battery feed to the immobilisation ECU (C0059) and the steering column interlock
ECU (C2055) on a pair of RY wires.
Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0099) on an R
wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the
switch (C0099) to fuse 39 of the passenger compartment fuse box (C0585) on a PB wire.
Fuse 39 (C0587) provides an auxiliary ignition feed to the immobilisation ECU (C0059) and
the steering column interlock ECU (C2055) on a pair of PB wires.
When the ignition switch is turned to the 'ignition' position, current flows across the switch
(C0099) to fuse 31 of the passenger compartment fuse box (C0585) on a G wire. Fuse 31
(C0587) provides an ignition feed to the steering column interlock ECU (C2055) on a GB
wire.
Fusible link 2 of the passenger compartment fuse box (C0591) provides a constant battery
feed to the ignition switch (C0099) on an R wire. When the ignition switch is turned to the
'crank' position, current flows across the switch (C0099) to the immobilisation ECU (C0059)
on a BY wire.
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