Part 3
Exterior Lighting
Automatic headlamp operation
The automatic headlamp function is a driver assistance system. The driver can override the system operation by selection of side lamp or headlamp on if the ambient light conditions require front and rear lighting to be active. The automatic headlamp system uses a light sensor and the CJB, which are connected via the LIN bus to control the headlamp functionality.
light sensor is incorporated in the rain/light sensor located on the inside of the windshield, below the rear view mirror. The wiper system also uses the rain/light sensor for automatic wiper operation.
The light sensor measures the ambient light around the vehicle in a vertical direction and also the angular light level from the front of the vehicle. The rain/light sensor uses vehicle speed signals, wiper switch position and the park position of the front wipers to control the system.
The automatic headlamp operation uses ambient light levels which are monitored by photodiode incorporated in the rain/light sensor. The rain/light sensor sends a lights on/off request to the CJB on the LIN bus, which responds by switching on the low beam headlamps, front side lamps and rear tail lamps.
The automatic headlamps are activated under the following conditions:
^ Twilight
^ Darkness
^ Rain
^ Snow
^ Tunnels Underground or multistoried car parks.
Operation of the automatic headlamps requires the ignition switch to be in position II, the lighting control switch to be in the 'AUTO' position and a lights on request signal from the light sensor. If the rain sensor signal activates the wipers fast speed wipers, the low beam headlamps are activated, providing the lighting control switch is in the 'AUTO' position.
Headlamp leveling
Headlamp leveling provides for the adjustment of the vertical aim of the headlamps. The leveling system is primarily required to minimise glare to other road users when a heavy load is in the rear of the vehicle.
Two systems of headlamp leveling are available; static and dynamic.
Static Vehicle Headlamp Leveling
Static vehicle headlamp leveling is performed by the air suspension system and the air suspension control module. The suspension system constantly monitors the vehicle attitude and adjusts the height of the front and/or rear of the vehicle accordingly. This maintains the correct vehicle attitude and consequently maintains the correct headlamp beam alignment.
The vehicle leveling system is fully automatic, therefore the lighting control switch does not have a manual leveling rotary control.
Dynamic Headlamp Leveling (Air Suspension)
Dynamic headlamp leveling is only available on vehicles with the AFS.
The dynamic headlamp leveling adjusts the vertical alignment of the headlamps as a rapid response to changes in vehicle attitude due to acceleration or braking.
The dynamic system is fully automatic, therefore the lighting control switch does not have a manual leveling rotary control.
NOTE: The AFS system also operates in conjunction with the vehicle leveling system as described previously.
The dynamic system comprises the following components:
^ Two headlamp leveling motors
^ AFS control module
^ Engine running signal from engine control module
^ Vehicle speed information from ABS module
^ Vehicle height information from air suspension control module.
When the ignition switch is in position (II), power is supplied to the lighting control switch via the ignition relay in the Battery Junction Box (BJB) and to the AFS control module. When the lighting control rotary switch is moved to the side lamp or headlamp position, the supply from the ignition relay is passed to the AFS control module.
NOTE: When the AFS control module receives an ignition on signal, the control module performs an initialisation procedure for both the AFS and headlamp leveling motors. Refer to the previous AFS section for details of the initialisation procedure.
The system operates by the AFS control module receiving inputs on the CAN from the air suspension control module for front and rear vehicle height, from the engine control module for engine running signal and from the ABS module for stop lamp switch active (brakes applied) and vehicle speed. The AFS control module processes these signals and provides an output to the headlamp leveling motors to adjust the headlamp vertical aim according to vehicle speed and attitude.
NOTE: In markets with Daytime Running Lamps (DRL), the dynamic headlamp leveling system will not operate when the DRL are active.
Exterior Lighting
Daytime running lamps (DRL)
Refer to the Daytime Running Lamps section for details.
Front fog lamp (If Fitted)
Front fog lamps are an optional fitment on low specification vehicles and a standard fitment on high specification vehicles.
Two front fog lamps are located in apertures in the front bumper. Each lamp is secured in the bumper with three screws which are covered with a finisher. The fog lamp has an adjuster screw which is accessible by removal of the lamp surround and is used to set the fog lamp to the correct alignment.
The fog lamp uses a 55W halogen H11 bulb which is located in a holder. The holder is located in a hole in the rear of the fog lamp housing and is turned to lock in position.
The front fog lamps are controlled by the lighting control switch. When the ignition switch is in the ignition position (II) and the lighting control switch is in the side lamp or headlamp position, the lighting control switch can be pulled to the first position to activate the front fog lamps.
If the switch is pulled to the second position, the front and rear fog lamps are activated. A front fog lamp warning indicator is illuminated in the instrument cluster when the front fog lamps are active.
Front Fog Lamps Functionality (NAS and Canadian Markets Only)
The front fog lamps are powered by an additional relay (relay 5) which is located in the BJB in the engine compartment.
The front fog lamps operate as described previously but with the following differences which cover local laws governing lamp usage.
If the low beam headlamps and the front fog lamps are on at the same time, when the high beam headlamps are switched on, the front fog lamps will be automatically switched off. When the high beam headlamps are switched off, the front fog lamps will be switched back on automatically.
NOTE: The front fog lamps will also be switched off if the headlamp high beam flash function is operated.
Rear lamp assembly
The rear lamp assembly is a one piece unit which contains a stop/tail lamp, a turn signal lamp, a reversing lamp and a fog lamp. Five bayonet fitting bulbs are used (six on NAS vehicles with the addition of a side marker lamp). These are located in holders which fit into the applicable hole in the lamp housing and are locked by rotating. Each bulb holder is connected by wires to a connector on the rear of the lamp housing.
The rear lamp assembly is located in a recess in the vehicle body. Two studs on the outer edge of the lamp housing locate in the vehicle body. The lamp is secured with two screws which are located on the inner edge of the lamp housing, near the tailgate aperture.
Rear Stop and Side Lamp
The upper lamp is a combined stop and tail lamp and uses a 21W/5W bayonet fitting bulb. The stop lamp uses the 21W bulb filament and the side lamp uses the 5W bulb filament.
The stop lamp is activated when the ignition switch is in the ignition position (II) and the brake pedal switch is active (by depressing the brake pedal). The high mounted stop lamp will also be activated when the brake pedal is pressed.
The stop lamps can also be activated by the ABS when Hill Descent Control (HDC) is active. A signal from the ABS module energises a relay which supplies power to the stop lamps and high mounted stop lamp.
The side lamps are operated by selecting side lamps or headlamps on the lighting control switch. The side lamps are operational at all times and are not dependant on the ignition switch position. The side lamps will also be illuminated when the lighting control switch is in the AUTO position and a 'lights on' signal is received by the CJB from the rain/light sensor.
Turn Signal Indicator Lamp
The turn signal indicator lamp is located below the stop/tail lamp and uses a 21W bayonet fitting bulb.
The turn signal indicator lamps are operated by the left hand steering column multifunction switch or by the hazard flasher switch. The steering column multifunction switch is only active with the ignition switch in the ignition position (II), the hazard flasher switch is active at all times. When active, the turn signal indicator lamps will flash at a frequency cycle of 380ms on and 380ms off.
If a bulb fails, the remaining turn signal indicator lamp bulbs on that side of the vehicle flash at normal speed. The applicable turn signal indicator in the instrument cluster will flash at double speed to alert the driver to the bulb failure.
Reversing Lamp
The reversing lamp is located adjacent to the turn signal lamp and uses a 21W bayonet fitting bulb.
The reversing lamp is active when the ignition switch is in the ignition position (II) and the CJB receives a reverse selected signal on the CAN bus. The automatic transmission has a reverse switch which senses when reverse is selected.
Rear Fog Lamp
The rear fog lamp is located at the bottom of the rear lamp and uses a 21W bayonet fitting bulb.
The rear fog lamp is controlled by the lighting control switch. When the ignition switch is in the ignition position (II) and the lighting control switch is in the side lamp or headlamp position, the lighting control switch can be pulled to the second position (if front fog lamps fitted) to activate the front fog lamps. If front fog lamps are not fitted, the switch need only be pulled to the first position. A rear fog lamp warning indicator is illuminated in the instrument cluster when the rear fog lamps are active.
Turn signal indicator repeater lamp
The repeater lamps are located in the driver and passenger doors, below each door mirror. The lamps are clipped into an aperture in the door panel and can be removed by sliding rearwards and releasing the front edge of the lamp from the door. The repeater lamps use a 5W capless bulb which is located in a holder.
The repeater lamps have the same functionality as the front and rear turn signal indicator lamps and are operated by the left hand steering column multifunction switch or by the hazard flasher switch. The steering column multifunction switch only active with the ignition switch in the ignition position (II), the hazard flasher switch is active at all times. When active, the repeater lamps will flash at a frequency cycle of 380ms on and 380ms off. If a lamp bulb fails, the remaining turn signal indicator lamp bulbs continue to flash at the normal rate.
Left hand steering column multifunction switch
The steering column multifunction switch is located on the left hand side of the steering column and controls the following functions:
^ Headlamp low/high beam
^ Headlamp high beam flash
^ Left/right turn signal indicator lamps
^ Trip computer functions.
The high beam on and flash functions are connected on separate wires to the CJB. When the switch is operated in either position a ground path is completed which is sensed by the CJB which activates the selected function.
The turn signal indicator lamps are connected and operate in a similar way with the ground path completed through a separate wire which is sensed by the CJB which activates the applicable turn signal indicator lamps.
Hazard flashers
The hazard flashers are controlled by a non-latching switch in the center of the instrument panel. The hazard flashers operate at all times when selected and are not dependant on ignition switch position.
When the hazard flashers are selected on, all of the front, rear and side turn signal indicator lamps operate as previously described and both left and right turn signal indicators in the instrument cluster also flash. The hazard warning flashers flash at a rate of 380ms on and 380ms off. When the hazard flashers are active, they override any request for turn signal lamp operation.
The hazard flashers can also be activated by a crash signal from the restraints control module. This is received by the CJB which activates the hazard flashers. The hazard flashers can be cancelled by moving the ignition switch to the auxiliary position I or the off position O or the crash mode is cancelled by the restraints control module.
License plate lamps
Two license plate lamps are fitted in the tailgate handle, above the license plate in the upper tailgate. Each lamp uses a 5W capless type bulb. The lamps are secured in the upper tail gate handle with integral clips. The lamps can be released from the handle using a small, flat blade screwdriver.
The license plate lamps are active at all times when the side lamps or headlamps are switched on.
High mounted stop lamp
The high mounted stop lamp is located in the tailgate spoiler.
The lamp comprises a plastic housing with a red coloured lens. The lamp is illuminated by 24 Light Emitting Diodes (LED's).
The high mounted stop lamp is activated, along with the tail lamp stop lamps, when the ignition switch is in the ignition position (II) and the brake pedal switch is active (by depressing the brake pedal).
The high mounted stop lamp and the stop lamps can also be activated by the ABS when Hill Descent Control (HDC) is active. A signal from the ABS module energises a relay which supplies power to the stop lamps.
Trailer lighting
Several different types of trailer socket can be fitted to the vehicle depending on market specifications. Refer to the Electrical Reference Library for specific socket details.
The CJB monitors the turn signal lamps and can detect if more than two lamps are fitted (the side turn signal lamps are not monitored). When a trailer is detected, the trailer warning indicator in the instrument cluster will flash in synchronisation with the turn signal indicators.
If one or more of the turn signal lamps on the vehicle or the trailer are defective, the trailer warning indicator will not flash to alert the driver to the bulb failure.
Diagnostics
The diagnostic socket is located in the lower instrument panel closing panel, on the driver's side, below the steering column. Various lighting system functions are monitored by different systems which can store fault information. This can be retrieved using T4 or other suitable scan tool.
Central Junction Box (CJB)
The CJB monitors the status of the lighting circuits, relays and switches. If a fault occurs, the CJB stores a fault code applicable to the specific fault which can be retrieved using T4 or other suitable scan tool.
Control diagram
