Function Description

Function Description

Function Requirement

1 Switching on based on the ambient light

The rain/light recognition sensor (G397) sends the ambient light information to the vehicle electrical system control module (J519) via the LIN data bus.

The follow criteria must be met in order for the rain/light recognition sensor to work correctly:

• The glass near the sensor must be clean.

• The coding in the rain/light recognition sensor must be adapted to the glass.

The lamps could switch on too early or too late if the working range for the rain/light recognition sensor is set incorrectly.

If the brightness limit is not met, then the data bus tells the vehicle electrical system control module to switch on the headlamps.

The comfort system central control module (J393) switches on the tail lamps and the vehicle electrical system control module switches on the headlamps. The illumination for the instrument cluster and the switches will also be switched on.





2 Switching on via the rain recognition sensor

The low beams will switch on after a predetermined number of wipe cycles (rain/light recognition sensor). The number of wipe cycles depends on the ambient light.

The comfort system central control module switches on the tail lamps and the vehicle electrical system control module switches on the headlamps.

The rain/light recognition sensor switches off automatically if the wipers do not move for a specific amount of time. On this case the illumination for the instrument cluster and the switches will not switch on.

3 Switching on via the fog lamps

Whenever the fog lamp button is pressed, the low beam headlamps turn on if the switch is set to AUTO. This will happen regardless of the amount of darkness the rain/light recognition sensor senses. It is only possible to switch off the low beams by turning the ignition on or off.