Engine Immobilisation

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.

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.

Steering Column Interlock ECU
The steering column interlock ECU (C2055) receives the following power supplies:
^ A constant battery feed from fuse 18 of the passenger compartment fuse box (C0584) on an RY wire.
^ An auxiliary ignition feed from fuse 39 of the passenger compartment fuse box (C0587) on a PB wire.
^ An 'ignition on' feed from fuse 31 of the passenger compartment fuse box (C0587) on a GB wire.

The ECU is earthed on an NB wire.

Transponder Coil
The transponder coil (C0049) is connected to the immobilisation ECU (C0059) by YU and YN wires. Both connections between the immobilisation ECU and the transponder coil switch between being both inputs and outputs. The transponder coil reads the vehicle identification information contained within the key transponder and relays it to the immobilisation ECU.

Immobilisation ECU
The immobilisation ECU (C0059) is located beneath the centre console, adjacent to the handbrake. It receives a constant battery feed from fuse 18 of the passenger compartment fuse box (C0584) on an RY wire, and an auxiliary ignition feed from fuse 39 of the passenger compartment fuse box (C0587) on a PB wire.

If the immobilisation ECU (C0059) has received a valid signal from both the transponder coil (C0049) and the steering column interlock ECU (C2055) when the ignition switch is turned to the 'crank' position, it transmits a rolling code to the Engine Control Module (ECM) (C0331) on a BP wire. The immobilisation ECU (C0059) also provides a feed to the starter motor relay (C0179) on a B wire.

V8

Power Distribution
Feed from the positive battery terminal (C0192) is supplied to the following on an R wire:
^ Fusible link 2.
^ Fuse 18.
^ Fuse 25.
^ Fuse 53.

All are located in the passenger compartment fuse box (C0632).

Fusible link 2 (C0591) provides a constant battery feed to the immobilisation ECU (C0059) 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 (C0028) on an R wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0028) 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 (C0028) 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.

Fuse 25 of the passenger compartment fuse box (C0583) provides a constant battery feed to the ignition switch (C0028) on an RU wire. When the ignition switch is turned to the 'crank' position, current flows across the switch (C0028) to the Engine Control Module (ECM) (C0331) on a BY wire.

Steering Column Interlock ECU
The steering column interlock ECU (C2055) receives the following power supplies:
^ A constant battery feed from fuse 18 of the passenger compartment fuse box (C0584) on an RY wire.
^ An auxiliary ignition feed from fuse 39 of the passenger compartment fuse box (C0587) on a PB wire.
^ An 'ignition on' feed from fuse 31 of the passenger compartment fuse box (C0587) on a GB wire.

The ECU is earthed on an NB wire.

Transponder Coil
The transponder coil (C0049) is connected to the immobilisation ECU (C0059) by YU and YN wires. Both connections between the immobilisation ECU and the transponder coil switch between being both inputs and outputs. The transponder coil reads the vehicle identification information contained within the key transponder and relays it to the immobilisation ECU.

Immobilisation ECU
The immobilisation ECU (C0059) is located beneath the centre console, adjacent to the handbrake. It receives a constant battery feed from fuse 18 of the passenger compartment fuse box (C0584) on an RY wire, and an auxiliary ignition feed from fuse 39 of the passenger compartment fuse box (C0587) on a PB wire.

If the immobilisation ECU (C0059) has received a valid signal from both the transponder coil (C0049) and the steering column interlock ECU (C2055) when the ignition switch is turned to the crank position, it transmits a rolling code to the Engine Control Module (ECM) (C0331) on a BP wire.

The immobilisation ECU (C0059) also provides a feed to the interlock relay (C1455) on a B wire. The energised interlock relay (C1455) provides a feed to the starter motor relay (C0179) on a B then BY wire.