Function

Function

Active headlights




Active headlights are an intelligent headlight system that optimizes illumination of the road surface at night by turning out the light beam. The motorized headlights are controlled by the headlight control module (HCM), which retrieves signals from the CAN network.
In order to activate the active headlight function, the headlight control module (HCM) (4/118) needs information on the following: vehicle speed, current gear, light conditions.

The headlight control module (HCM) receives information from the following control modules:
- Brake control module (BCM) (4/16) for information on vehicle speed
- Transmission control module (TCM) (4/28) for information on current gear (automatic transmission)
- Central electronic module (CEM) (4/56) for information from the reversing light switch (3/10) (manual transmission)
- Central electronic module (CEM) for information from the twilight sensor (7/12)
The headlight control module (HCM) is activated automatically when the ignition switch is turned to position II. In order to turn out the light beam, the following conditions must be fulfilled:
- The vehicle must be in motion, that is to say travelling at a speed greater than 3.6 km/h (2.2 mph).
- Reverse gear must not be engaged.
- No daylight light conditions.
The switch for active headlights on the climate control module (CCM) (3/112) can be used to disable/enable the function.
When the function is active, the headlight control module (HCM) receives continual information on vehicle speed and steering angle. Vehicle speed is obtained from the brake control module (BCM) while steering angle information comes from the steering wheel angle sensor module (SAS) (3/254). This information enables the headlight control module (HCM) to calculate the current turn-out of the light beam.

Shift light beam and limit active control for right-hand/left-hand traffic ("tourist mode")





Note! Changing light pattern and limiting active control is only permitted on certain markets. The function is controlled by the software in Headlamp Control Module (HCM).

If the vehicle is designed for right-hand traffic and is used in a country where traffic drives on the left, the light beam must be shifted and active control limited so as not to blind oncoming traffic. This also applies if the vehicle is designed for left-hand traffic and is used in a country where traffic drives on the right.
In order to change the setting, hold the active headlight switch on the climate control module (CCM) depressed for at least five seconds.
When the setting has been changed, a message appears in the driver information module to indicate the current setting (for right-hand or left-hand traffic) of the vehicle.
When the setting has been changed and the vehicle is in "tourist mode":
- When driving straight ahead, the light beam is turned in a suitable direction so as not to blind oncoming traffic.
- As before, the light beam will also be turned out in the suitable direction when cornering, just not as much.
- The light beam is also aimed down slightly (shorter beam length) so as not to blind oncoming traffic.
The vehicle must be stationary when the setting is changed.

Note! The light beam must under no circumstances be adjusted with the adjuster screws when in "tourist mode". If the light beam is adjusted with the adjuster screws when the system has aimed the headlights down, there is a substantial risk that the vehicle will blind oncoming traffic when the system resumes normal mode.