Inertia Switch

Inertia Switch

Fuse 10 of the engine compartment fuse box (C0575) provides a constant battery feed to the inertia switch (C0123) on a G wire. The inertia switch is a normally closed switch. If the inertia switch hasn't been tripped, current flows across the switch (C0123) to the fuel pump relay (C0575) on a GU wire.

The inertia switch (C0123) also provides a feed to the Central Control Unit (CCU) (C0428) on a UG wire. For more information on the CCU, refer to the Control Units section of the Workshop manual, and the Anti-theft Alarm and Central Door Locking (CDL) section of this manual.  ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

Fuel Pump Relay

The fuel pump relay coil receives a feed from the energised main relay (see above). The earth path for the relay coil (C0575) is controlled by the ECM (C0331) on a BP wire. The ECM will energise the fuel pump relay when it receives an ignition feed from fuse 6 of the passenger compartment fuse box (C0581) on a W wire.

The energised fuel pump relay (C0572) provides a feed to the fuel pump (C0114) on a WP wire. The fuel pump (C0114) is earthed on a B wire.

Starter Relay

Fuse 5 of the passenger compartment fuse box (C0581) provides an ignition switch 'crank' feed to the immobilisation ECU (C0059) on a WR wire. If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter relay coil (C0576) on a RW wire. The starter relay is located in the engine compartment fuse box, and is earthed (C0576) on a B wire. A feed from fusible link 7 is now able to flow across the starter relay switch contacts (C0572) to the starter motor solenoid (C0179) on an NR wire.

For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual.  ENGINE IMMOBILISATION.

Starter Motor and Starter Motor Solenoid

The starter motor solenoid coil (C0179) receives a feed from the energised starter relay (C0572) on an NR wire (see above). The energised starter motor solenoid allows a battery feed (C0178) to flow across the switch contacts and power the starter motor.