Active Headlights
Active headlamps are an intelligent headlamps system that optimizes lighting of the road surface at night by expanding the light beam. The motorized headlamps are controlled by the Central electronic module (CEM), which retrieves signals from the CAN network and, in some cases, from directly connected sensors.
For the active headlamp function to be activated the Central electronic module (CEM) (4/56) requires information about the vehicle speed, gear and steering wheel angle.
The Central electronic module (CEM) receives information from the following control modules:
- Brake control module (BCM) (4/16)
- information about vehicle speed
- Transmission Control Module (TCM) (4/28)
- information about the current gear (automatic gearbox)
- Steering wheel angle sensor module (SAS) (3/130)
- information about the steering wheel angle
- The Central electronic module (CEM) also used internal signals:
- information about the brake lamp switch (3/10) (manual gearbox)
- information from the twilight sensor (7/12)
The active headlamp function is only enabled if the following conditions are met:
- The vehicle must be in motion, that is, travel at a speed faster than 4 km/h.
- Reverse gear must not be engaged.
- No daylight light conditions.
Also, the function active headlamp must be activated. The function in active headlamp is deactivated/activated via the menu system in Infotainment control module (ICM) (3/281).
When the function is active, the Central electronic module (CEM) 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) (3/130). This information enables the Central electronic module (CEM) to calculate the current turn-out of the light beam.