Interior Lighting
Interior Lighting
COMPONENT LOCATION
OVERVIEW
Operation of the interior lighting system, with the exception of the door and mirror lamps, is controlled by the CJB. Door and mirror lamp operation is controlled by the relevant door module.
In order to control the interior lighting system, the CJB receives inputs from the 4 door latch switches and the liftgate release motor. The system also interacts with the central locking system, illuminating the interior lamps and the mirror lamps on receipt of an unlock request. This request is transmitted to the CJB from the Radio Frequency (RF) receiver.
The front and rear roof mounted interior lamps contain a 3 position rocker switch. Automatic (Courtesy) operation of the lamps can be overridden by moving the switch to the 'always on' or 'always off' position.
If 'Courtesy' lighting is active and a hinged panel is left open, the CJB will extinguish all interior lamps after a period of 15 minutes. If a manual request for interior lighting has been made, the CJB will extinguish the lamps after a period of 30 minutes.
Pressing the light symbol on the remote handset will activate the 'Approach Lamp' feature. When activated, the CJB illuminates the mirror lamps and a number of exterior lamps. For additional information, refer to Exterior Lighting Exterior Lighting
On vehicles from 2009MY, the front interior lamp incorporates 2 map reading lamps. The front interior lamp is fitted with 2 additional switches which control each lamp and operate independently of the interior lighting functionality.
Transport Mode
All new vehicles will be delivered from the factory in transport mode. Transport mode inhibits a number of electrical systems and features, including the interior lamps, to eliminate quiescent drain from the battery during delivery. When the vehicle is in transport mode 'transp' will be displayed in the instrument cluster odometer.
To remove the vehicle from transport mode, the Land Rover approved diagnostic system must be connected during the Pre-Delivery Inspection (PDI). For more information, refer to the PDI manual.
CONTROL DIAGRAM
NOTE:
A = Hardwired; N = Medium speed Controller Area Network (CAN) bus
PRINCIPLES OF OPERATION
Operation and control of the interior lamps can be split into 3 main groups.
Front and Rear Interior Lamps, Footwell Lamps, and Load Space Lamp
The CJB controls operation of these lamps by providing a voltage feed to both sides of each lamp. By increasing or decreasing the voltage supplied to one side of the lamp, the CJB controls the current flow through the lamp and thus the lighting level. This feature is controlled via the interior lamp Field Effect Transistor (FET), which is integral with the CJB and allows the CJB to ramp up and ramp down the illumination levels of the lamps when required. The CJB controls the ramp up time to 1.3 seconds, and the ramp down time to 2.6 seconds.
If the vehicle is involved in an accident violent enough to trigger the Supplemental Restraint System (SRS), the Restraints Control Module (RCM) will provide a 250 Hz 'crash' signal to the CJB. On receipt of this signal the CJB will illuminate the front and rear interior lamps, the footwell lamps and the load space lamp for up to 30 minutes. The CJB will extinguish the interior lamps prior to the 30 minute period elapsing if the crash signal from the RCM is replaced with a 10 Hz 'normal' signal.
Vanity Mirror and Glovebox Lamps
The vanity mirror lamps and the glovebox lamp are provided a voltage feed by the CJB. When vanity mirror lamp operation is selected by pressing the relevant switch, a ground path is created causing the lamp to illuminate. Glovebox lamp illumination is controlled by a microswitch which is integral with the lamp assembly. When the glovebox is opened, the switch contacts close creating a ground path for the lamp.
Door and Mirror Lamps
Operation of the door and mirror lamps is controlled by the door modules in conjunction with the CJB. The CJB provides a feed to each door latch switch. When a door is opened, the switch contacts close providing a feed to the relevant door module. On receipt of this feed, the module illuminates its door lamp by providing a feed and ground path.
The driver and front passenger door modules also control operation of the mirror lamps. When a valid unlock request is received from the RF receiver, the CJB notifies the driver and front passenger door modules via the medium speed CAN bus. On receipt of the CAN bus message the door module illuminates the relevant mirror lamp by providing a feed and ground path.