Operation
Operation
General
The interior lamp operation is activated by any of the following inputs signals:
- Door switch contacts (front and rear)
- Ignition switch position 1 (Aux)
- Central locking lock request
- Central locking remote handset operation
- Crash sensor
- Front interior lamp switch.
The load space lamp and the upper tail door lamps are not switched on with the interior lamps. These lamps are only activated when the upper tail door is opened. When the upper tail door is opened, the interior lamps in addition to the load space lamps, are switched on and are subject to the BCU timers.
Automatic Operation
The automatic control of the interior lamps has several switch on and off conditions as follows:
- The interior lamps are switched on when one or more doors are opened. When all the doors are closed, the interior lamps are switched off after a delay of 20 seconds. If the vehicle is locked after closing the doors within the 20 second period the lamps go off immediately.
- When the interior lamps are on and the ignition is moved to positions I or II the lamps go off immediately after all doors have been closed.
- When the ignition switch is moved to the off position, the interior lamps are switched on for 20 seconds. This timer is overridden If a door is subsequently opened.
- When the vehicle is unlocked and the doors are closed the interior lamps can be activated for a further 20 second period by pressing the 'unlock' button on the remote handset.
- When the vehicle is unlocked from a locked condition the Interior lamps are activated for a 20 second period. This timer is overridden if a door is subsequently opened.
- If a door is left open the interior lamps will remain on for 16 minutes. After this period the BCU timer switches the interior lamps oft to prevent excessive battery drain.
The BCU uses a PWM operation of the interior lamps for the on/off conditions The lamps are switched on with a 'soft lamp' of 1.3 seconds. The lamps are switched off with a 'soft lamp' of 2.6 seconds. The soft on/off operation is controlled by a semiconductor within the BCU.
Manual Operation
The interior lamps can be switched on or off using the manual switch for the front interior lamp. The front interior lamp switch will switch all interior lamps front and rear, on or off. If the interior lamps are on when the switch is pressed all Interior lamps will go off. The on and off automatic switching conditions remain effective even when the manual switch is used.
If the Ignition switch is In position I or II and the front interior lamp switch is used to switch the interior lamps on the lamps will remain on continuously whilst the ignition is in position I or II. If the ignition switch is moved to the off position, the interior lamps will be subject to the 16 minute BCU timer. The interior lamp is immediately switched off when the vehicle is locked. After a locking procedure the interior lamp automatic control is reinstated.
The rear interior lamp switch will switch the rear interior lamp only on or off.
Continuous Off
To prevent drain on the battery if the doors are to remain open for some time the interior lamps can be turned off permanently. This is stored in the BCU EEPROM and is also activated following a system power down or a reset of the BCU.
To enter the continuous off condition the front interior lamp switch must be pressed and held for more than 3 seconds. The continuous off function can only be disabled by pressing the front Interior lamp switch, after which, full automatic control is resumed. When continuous off is active, the rear interior lamp switch can still be used to switch the rear interior lamp only on or off.
Crash signal Operation
The BCU receives a crash signal on a hardwired connection from the DCU in the event of a crash of a seventy to activate the airbags. On receipt of this signal, the BCU activates the interior lamps which are on permanently and not subject to the BCU timer.
The crash operation of the interior lamps can only be cancelled by operation the manual switch on the front interior lamp or by locking and unlocking the vehicle.