Immobilisation (Defender 110 Truck Cab only)

Immobilisation (Defender 110 Truck Cab only)

Feed from the positive battery terminal is connected to fusible link 2 of the engine compartment fuse box (C632-1) by a brown wire. Fusible link 2 (C907-2) is connected to fuse 2 (C580-3) of the passenger compartment fuse box by a brown wire.

Fuse 2 of the passenger compartment fuse box (C580-4) supplies a current to the interior lamp (C357-3) on a purple wire. The interior lamp has an integral switch. With this switch in the off (normal) position (C357-1) the only earth path is via the alarm ECU (C061-1) on a purple/white wire.

The alarm ECU (C061-16) is connected to the LH door switch (C033-1) by a purple/blue wire. If the LH door is closed, the door switch is open, and fails to provide a route to earth for the ECU. If the door is opened, the switch is closed, providing a route to earth and illuminating the interior lamp. The alarm ECU (C061-5) is also connected to the RH door switch (C054- 1), this time by a slate/white wire. The RH door switch operates in the same way as the LH door switch.

With the interior lamp integral switch in the on position (C563-1), a direct route to earth is provided on a black wire, illuminating the lamp.

The alarm ECU also receives a signal from the RF handset (see engine immobilisation). When the correct signal is received, the alarm ECU will illuminate the interior lamp. The lamp will remain illuminated until either the alarm is re- armed using the handset, the ignition is switched to position "II", or the time out period elapses.