Part 4
CJExterior Lighting
Reflective Static Signs
Manual Deactivation
There are situations when a driver is able to judge if a high beam deactivation is desirable before the high beam assist system actually operates, for example over a crest of a hill. Headlamps from an oncoming vehicle can sometimes be seen on the horizon prior to the detection sensor receiving an input. It is the driver's preference to determine if early intervention is desired in this and similar situations.
System Diagnosis
NOTE:
Windshield stickers, stone chips, dirt and general road film will affect the successful operation of the image sensor if sufficient blocking is present. Avoid placing reflective objects on the instrument panel, for example white paper which can affect the image sensor.
High beam assist has a self diagnosis capability by comparing data from the ambient light sensor input (located in the rear view mirror) to light levels detected by the image sensor. If a deviation is detected it is assumed that the ambient light available to the image sensor is being restricted by dirt or other blockage and the system will be deactivated. Diagnostic Trouble Code (DTC)'s are stored in the control module's memory and can be accessed using an approved Land Rover diagnostic system. Within the diagnostic system is a procedure to test the basic operation of the camera function.
In the event of a fault, the warning strategy to the driver is as follows:
- Image sensor internal fault - green icon will extinguish with no additional message to driver
- CJB has lost all communication with image sensor - green icon will extinguish with no additional message to driver
- Image sensor blocked - green icon will extinguish with an additional "High Beam Assist Sensor Blocked" message within the message centre
System Calibration
To achieve effective operation of the high beam assist system, a calibration routine is performed on vehicle build and system tolerances are set to an accuracy of +/- 0.2 degrees.
This initial calibration is a 'one time only' procedure. Should the high beam assist components or the windshield require replacement at the dealership, an automatic calibration routine will be performed. This 'auto aim' calibration procedure is a continual process that takes place during a normal drive cycle at night and could take between 10 - 30 minutes dependant on the following driving conditions:
- If sufficient road markings (lane markings) are visible to the image sensor - approximately 10 minutes
- If insufficient road markings are visible, the system uses the tail lights of preceding vehicles - approximately 30 minutes.
NOTE:
Until this calibration is complete the system may not react correctly during operation. This should be made clear to the customer before vehicle handover. During any calibration or rectification work the headlamps should be checked for correct alignment.
NOTE:
Due to mechanical calibration tolerance the correct mirror assembly must be used for the vehicle model types in question and it is not exchangeable with other vehicle model types.
NOTE:
After any rectification work and before any calibration drives, the headlamps should be checked for correct alignment.
HEADLAMP DELAY
The CJB controls a headlamp delay function which illuminates the driveway after leaving the vehicle. The headlamp delay will operate on low beam headlamps only regardless of the position of the left hand steering column multifunction switch.
The headlamp delay is activated when the lighting control switch is in the 'Auto' position and the engine is switched off. The message center displays a 'HEADLIGHT DELAY' message and the low beam headlamps will be activated for a period of approximately 30, 60, 120 or 240 seconds, which is selectable using the instrument cluster menu. After the delay period, the CJB automatically switches off the delay function, extinguishing the headlamps.
The headlamp delay feature can also be switched off by pressing the headlamp button on the smart key.
INSTRUMENT CLUSTER WARNING INDICATOR ILLUMINATION
The warning indicators in the instrument cluster for left and right turn signal indicator, front and rear fog lamps and headlamp low and high beam and side lamps are activated by the CJB via messages to the instrument cluster on the medium and high speed CAN buses. The synchronization of the turn signal warning indicator with the external turn signal indicator lamp frequency is controlled by a cyclic transmission of the light status on the medium speed CAN bus.
The AFS warning indicator is controlled by a signal from the AFS control module.
FRONT FOG LAMPS
The front fog lamps are located in the front bumper. Each lamp is secured to three lugs in the bumper and retained with self tapping screws and fasteners. Each lamp has an adjustment thumbwheel which provide for the vertical alignment of the beam. Access to the thumbwheel requires removal of the lamp bezel.
The 55W halogen bulb is located in a holder. The holder is secured in the lamp housing by rotating through approximately 10°. The holder has a connector to allow for connection to the electrical harness.
TAIL LAMP ASSEMBLY
The rear tail and turn signal indicator lamp assemblies are located on the outer corner of each rear wing panel.
The lamp assembly is retained by two integral plastic clips which locate in corresponding clips secured to the body panel. The assembly is further retained by two self tapping screws which are accessed from inside the tailgate aperture. To remove the assembly, after removing the screws, the assembly must be prized at two indentations to release the clips. A non-metallic tool must be used with care to avoid damage to the paint finish and the lamp assembly.
All lamps in the tail lamp assembly use LED's's. The stop lamp is located in the upper section of the lamp assembly and is illuminated by 19 LED's. Surrounding the stop lamp is the upper tail lamp which is illuminated by 9 LED's. The rear fog lamp is located in the lower section of the tail lamp assembly and is illuminated by 3 high power LED's. Surrounding the fog lamp is another circular ring of 12 LED's which function as the lower tail lamp. The turn signal indicators are 3 horizontal strips located between the upper and lower tail lamps and are illuminated by 12 LED's.
On NAS vehicles, an additional LED is used to accommodate the side marker lamp. The LED lens has a vertical section which is used as the side marker illumination required for the NAS market.
None of the LED's are serviceable items.
SIDE REPEATER LAMPS
The side repeater lamps are located in the front fenders, forward of the louvered air vents. The side repeater lamps are clipped into the fender aperture and can be removed by pushing forwards and pulling outwards from the fender.
The side repeater lamps use a capless 5W bulb which is pressed into contacts in a holder. The holder is located in the lamp assembly. These lamps are not monitored by the CJB and if a failure occurs the driver will not receive a message.
REVERSING LAMPS
The reversing lamps are located in the lower tail door and positioned at either side of the license plate. The lamps are secured in the tail door with a clip at the bottom and positively secured with a screw at the top.
Each reversing lamp uses a 6W bayonet type bulb.
LICENSE PLATE LAMPS
Two license plate lamps are located in the trim above the license plate in the lower tail door. The lamps are press fitted in their apertures and secured by an integral plastic clip.
Each lamp uses a 5W festoon type bulb.
HAZARD WARNING LAMPS
The hazard warning lamps use the front and rear turn signal indicator lamps as previously described. These are controlled by the CJB in response to a hazard warning lamp request from the instrument panel switch.
Crash Signal Activation
In the event of an accident of a severity to activate and deploy the airbags, the RCM requests various electrical operations to assist with the crash situation. The RCM requests via the bus systems to the CJB to activate the hazard warning lamps. These will continue to operate until deselected using the hazard warning lamp switch in the instrument panel. The lamps flash at a frequency which is the same as the frequency used to flash the headlamp high beam in the same situation.
DAYTIME RUNNING LAMPS (DRL)
DRL operation is detailed in a separate section. For additional information refer to 417-04 Daytime Running Lamps.
LEFT HAND STEERING COLUMN MULTIFUNCTION SWITCH
The left hand 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 indicators
- Trip computer functions. For additional information refer to 413-08 Information and Message Center.
The high beam on and flash functions are connected on a single wire to the CJB. The switch assembly contains resistors and the ground for each selection is passed through a different resistor for each selection. The same also applies to the turn signal indicators. The cjb senses the resistance on the ground wire and determines which function has been selected.
The turn signal indicators incorporate a lane change function. To activate the lane change function, hold the lever partially up or down against spring pressure to indicate a lane change. The directional indicator will flash three times. The lane change function can be enabled or disabled using an approved Land Rover diagnostic system.
EXTERIOR LIGHTING CONTROL DIAGRAM - SHEET 1 of 2
NOTE:
A = Hardwired; D = Medium Speed CAN bus; O = LIN Bus.
EXTERIOR LIGHTING CONTROL DIAGRAM - SHEET 2 of 2
NOTE:
A = Hardwired; D = High speed CAN bus; N = Medium speed CAN bus
AUTO HIGH BEAM CONTROL DIAGRAM
NOTE:
A = Hardwired; D = High Speed CAN; N = Medium Speed CAN; O = LIN Bus
