Ford Focus RS 2016 Technical Service Training page 74

Exterior Lighting
The Bi-Xenon HID headlamp also contains LEDs that
are signature lights when used as DRL (daytime running
lamps) and are illuminated at their highest intensity or
parking lamps and are illuminated at a reduced intensity
when the parking lamps or headlamps are activated.
E197679
NOTE: Adaptive front lighting is only activated when
the headlamp switch is in the AUTOLAMPS position.
Adaptive front lighting uses a HCM (headlamp control
module) to command the left/right aiming of the
headlamps through the LIN (local interconnect network)
to the headlamp assemblies.
The headlamp assemblies contain a module that receives
the messages through the LIN from the HCM.
Pedestrian Area Light Mode
E197661
72
Lesson 4 – Electrical
Depending on the inputs received (steering wheel angle
and vehicle speed for example), the HCM can command
the angle at which the headlamps are aimed (left or
right) to improve nighttime visibility around curves.
Additional functions have been added to the existing
adaptive front lighting system enabling it to adapt the
light beam to the respective driving situation.
Different light distributions e.g. for city or country
roads, adverse weather or freeway light, can be
generated using the free-form drum based on internal
vehicle data. A projection module with a rotating
free-form drum between the light source and lens is
required for this.
The drum has different contours and can swivel around
its own longitudinal axis. The drum is swivelled into
the required position within milliseconds using a stepper
motor and in this way adapts the cut-off line to the
respective light mode.
The following light modes are used depending on the
vehicle speed and lighting conditions.
NOTE: The indicated speeds are approximate values.
The loop must include hysteresis in order to avoid
control oscillations due to constant fluctuations above
and below the speed limits resulting in continuous
cycling between the light modes. The result is that the
higher light mode in each case is maintained.
Service Training