Exterior Lighting: Overview

Exterior Lighting

OVERVIEW
The lighting systems are controlled by the EJB (engine junction box), RJB (rear junction box) and the CJB (central junction box). The two boxes contain fuses, relays and microprocessors to control the power supply and functionality of the lighting systems.
Driver lighting selections using the LH (left-hand) steering column multifunction switch or the auxiliary lighting switch are passed to the CJB (central junction box) via the instrument cluster.
The lighting system has an 'auto' lights function which is controlled by the CJB (central junction box) on receipt of signals from the rain/light sensor located at the top of the windscreen. The exterior lights are turned on or off in response to ambient light signals from the rain/light sensor on a LIN (local interconnect network) bus connection to the CJB (central junction box). The auto lights can also be activated when the windshield wipers are activated by signals from the rain sensor, which is located at the top of the windshield or when the driver activates the wipers in the fast wipe position.
Two levels of headlamp specification are available; halogen or xenon. In certain markets the headlamps feature a cornering lamp or a static bending lamp which illuminates the area at the side of the vehicle when turning into driveways for example. North American Specification (NAS) vehicles have a side marker lamp installed in the headlamp assembly. Replacement of any of the headlamp bulbs requires removal of the headlamp assembly.
The tail lamp comprises two separate lamp assemblies. The turn signal indicator, side and stop lamps and reverse lamps are located in each rear fender tail lamp assembly. The rear fog lamps are located in separate units attached to the luggage compartment lid. A side marker lamp is fitted to the rear fender tail lamp assembly and is fitted in all markets.
Two systems of headlamp leveling are available; manual leveling which is only available on halogen headlamps and static dynamic leveling which is available on xenon headlamps. The manual system uses a thumbwheel rheostat to adjust the vertical alignment of the headlamps to compensate for differing vehicle loading. The static dynamic system uses height sensors fitted to the front and rear suspension and a headlamp leveling module which periodically monitors the vehicle attitude and adjusts the headlamp vertical alignment accordingly.