LR3/Disco 3
Faults can be investigated by interrogating the AFS control module using T4 to check for fault codes.
Static Bending Lamps
NOTE :
The static bending lamps are a standard feature on AFS headlamps designed to illuminate the direction of travel when
cornering at low speeds. The design of the lens projects a spread of light from the vehicle at approximately 45 degrees to
the vehicle axis. The static bending lamps are controlled by the CJB.
The static bending lamp is incorporated into the outer part of the headlamp assembly and shares the same housing and
reflector as the side lamp.
The static bending lamp uses a 35W Halogen H8 bulb which locates in a holder which is connected via wires to the main
connector on the headlamp housing. The holder is located in an aperture in the headlamp housing and rotated to lock.
The bulb is accessible via a removable cover at the rear of the headlamp housing.
AFS Control
The static bending lamps operate with a steering angle sensor signal which is received by the AFS control module and
the CJB. The AFS control module sends a static bending lamp on request to the CJB which activates the static bending
lamp bulb.
At speeds above 30 mph (48 km/h), the static bending lamp in the direction of the turn is illuminated when the steering
wheel rotation reaches 70 degrees. As the vehicle turn is decreased, the static bending lamp is switched off when the
steering wheel rotation reaches 50 degrees.
At speed below 30 mph (48 km/h), the static bending lamp in the direction of the turn is illuminated when the steering
wheel rotation reaches 245 degrees. As the vehicle turn is decreased, the static bending lamp is switched off when the
steering wheel rotation reaches 225 degrees.
The operation of the static bending lamps is controlled by the CJB. When the operation parameters of the lamp are
reached, the CJB fades the static bending lamp bulb on using a PWM voltage over a period of approximately 2 seconds.
When the lamp is switched off, the CJB fades the bulb off by decreasing the PWM voltage.
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.
A 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. For additional information, refer to
Wipers and Washers
(501-16 Wipers and Washers)
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 static bending lamps are not fitted to NAS market vehicles
