Description

Interior Lighting

CONTROL DIAGRAM

NOTE:
A = Hardwired; N = Medium speed CAN (controller area network) 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, Load Space Lamp and Front Door Sill Lamps
The CJB (central junction box) 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 (central junction box) 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 (central junction box) and allows the CJB (central junction box) to ramp up and ramp down the illumination levels of the lamps when required. The CJB (central junction box) 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 SRS (supplemental restraint system), the RCM (restraints control module) will provide a 250 Hz 'crash' signal to the CJB (central junction box). On receipt of this signal the CJB (central junction box) will illuminate the front and rear interior lamps, the footwell lamps and the load space lamp for up to 30 minutes. The CJB (central junction box) will extinguish the interior lamps prior to the 30 minute period elapsing if the crash signal from the RCM (restraints control module) is replaced with a 10 Hz 'normal' signal.
Vanity Mirror and Glove Box Lamps
The vanity mirror lamps and the glove box lamp are provided a voltage feed by the CJB (central junction box). When vanity mirror lamp is fitted, the operation is automatic when deploying or stowing the sunvisor, the power side is switched in causing the lamp to illuminate. Glove box lamp illumination is controlled by a micro switch which is integral with the lamp assembly. When the glove box is opened, the switch contacts close creating a ground path for the lamp.
Mirror Lamps
The driver and front passenger door modules control operation of the mirror lamps. When a valid unlock request is received, the CJB (central junction box) notifies the driver and front passenger door modules via the medium speed CAN (controller area network) bus. On receipt of the CAN (controller area network) bus message, the door module illuminates the relevant mirror lamp by providing a feed and ground path.