Engine Immobilisation

ENGINE IMMOBILISATION

DESCRIPTION

GeneralThe function of the engine immobilisation system is to prevent unauthorised starting of the vehicle. The system is controlled by the immobilisation ECU, which is located behind the centre of the fascia. 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 barrel.

OPERATION

General
Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 3, and fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) is connected to fuse 32 of the passenger compartment fuse box (C0587) by an NW wire. Fuse 32 (C0584) provides a constant battery feed to the immobilisation ECU (C0059) on a PN wire.

Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0028) to fuse 11 of the passenger compartment fuse box (C0588) on a PS wire. Fuse 11 (C0580) provides an auxiliary ignition feed to the Central Control Unit (CCU) (C0430) on an LGW wire.

When the ignition switch is turned to the 'crank' position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire. Fuse 5 (C0581) provides a feed to the immobilisation ECU (C0059) on a WR wire. The immobilisation ECU (C0059) is earthed on a B wire.

Immobilisation ECU Inputs/Outputs
The immobilisation ECU receives inputs and outputs from a number of different components to ensure the right criteria are met before it will allow the engine to be started.