Variable light distribution

In the Europe version, the variable light distribution function is integrated in the footwell module (FRM) or front electronics module (FEM) or body domain controller (BDC). The variable light distribution is not available in US market versions.

City light distribution 

The urban light distribution pattern projects more light toward the left edge of the road than the previous lighting system. The footwell module (FRM) or front electronics module (FEM) or body domain controller (BDC) achieves improved illumination of the roadway through following measures:

• Lowering the left headlight
• Tilting the left headlight to the left

The urban light distribution pattern is available as soon as the engine running signal is present. The Digital Engine Electronics (DME) and Digital Diesel Electronics (DDE) furnish the signal.

Country road light distribution 

The secondary road light distribution pattern corresponds to the pattern hitherto employed for the driving light. This lighting function is available once Terminal 15 on status is present. The country road light distribution represents the basic setting for the headlights. The basic setting is assumed when there are faults in the complete light distribution system.

The system switches from urban traffic light distribution to country road light distribution as soon as the driving speed exceeds 45 kilometers per hour. The system reverts to the urban light distribution pattern when the driving speed falls back below 40 kilometers per hour. The footwell module (FRM) or front electronics module (FEM) or body domain controller (BDC) receives the speed signal as well as the engine running signal from the central gateway module (ZGM).

Motorway light distribution 

The motorway light distribution increases the range of the driving light under certain conditions.

The foowell module (FRM) or front electronics module (FEM) or body domain controller (BDC) switches the headlights to motorway light distribution mode under following conditions:

• Driving speed exceeds 110 kilometers per hour for longer than 30 seconds
• Driving speed exceeds 140 kilometers per hour

The headlights are lowered once the driving speed falls below 110 kilometers per hour. The headlights are lowered (reducing the headlight beam throw) in gradual stages as the speed drops below 110 kilometers per hour:

• 110 kilometers per hour
• 100 kilometers per hour
• 90 kilometers per hour
• 80 kilometers per hour

From 80 kilometers per hour, the headlights are fully reset to country road light distribution.