Defender 1999 MY vehicle are fitted with an interior lamp in the front of the vehicle. 110 Station wagon vehicles are also fitted with a rear interior lamp. Both lamps can be switched on manually using their integral switches. If any door, including the tail door are opened, the lamps will illuminate. The lamps are controlled by the alarm ECU. The ECU contains a time out feature which switches off the interior lamps after eight minutes if any door is left open, thus preventing unnecessary battery drain.
Operation
90/110 Hard Top and 90 Station Wagon
Feed from the battery positive terminal is connected to fuse 6 and fuse 7 of the engine compartment fuse box (C0632-1) by a brown wire. Fuse 6 (C0574-2) supplies a feed to the alarm ECU (C0057-8) on a purple/brown wire. Fuse 7 (C0574-1) supplies a feed to the front interior lamp (C0355-3) on a purple/brown then purple wire.
The interior lamp has an integral switch. With this switch in the normal (central) position, the lamp is earthed (C0355-1) via the alarm ECU (C0061-1) on a purple/white wire. The alarm ECU will only supply the lamp with an earth path is either of the front doors, or the tail door, are opened.
The alarm ECU (C0061-5) is connected to the drivers door switch (C0054-1) by a slate/white wire. The passenger door switch (C0033-1) and the tail door switch (C0615-1) are wired in parallel and are connected to the alarm ECU (C0061-16) by purple/blue wires.
If the internal switch is moved to the forward ’ON’ position, the feed from fuse 7 flows across the interior lamp (C0355-3 & C1210-1) directly to earth on a black wire. Moving the switch to the rear ’OFF’ position, breaks the circuit to prevent the lamp from illuminating when any of the doors are opened.
110 Station Wagon
Feed from the battery positive terminal is connected to fuse 6 and fuse 7 of the engine compartment fuse box (C0632-1) by a brown wire. Fuse 6 (C0574-2) supplies a feed to the alarm ECU (C0057-8) on a purple/brown wire. Fuse 7 (C0574-1) supplies a feed to the front (C0355-3) and rear (C0356-3) interior lamps on a purple/brown then purple wires.
The front interior lamp has an integral switch. With this switch in the normal (central) position, the lamp is earthed (C0355-1) via the alarm ECU (C0061-1) on a purple/white wire. The alarm ECU will only supply the lamp with an earth path if any of the doors, or the tail door are opened.
The Alarm ECU (C0061-5) is connected to the drivers door switch (C0054-1) by a slate/white wire. The front passenger door switch (C0033-1), the LH rear door switch (C0112-1), the RH rear door switch (C0111-1) and the tail door switch (C0615-1) are wired in parallel and are connected to the alarm ECU (C0061-16) by purple/blue wires.
If the internal switch is moved to the forward ’ON’ position, the feed from fuse 7 flows across the interior lamp (C0355-3 & C1210-1) directly to earth on a black wire. Moving the switch to the rear ’OFF’ position, breaks the circuit to prevent the lamp from illuminating when any of the doors are opened.
The rear interior lamp is wired in parallel with the front interior lamp and works on exactly the same principal.