Automatic headlamp actuation, function

N82.10-2411-09

A1 Instrument cluster

B38/2 Rain/light sensor

E1 Lamp unit, left front

E1e2 Low beam, left

E1e3 Standing and parking lamp, left

E2 Lamp unit, right front

E2e2 Low beam, right

N10 SAM control unit

N70 Overhead control panel control unit

N73 EIS [EZS] control unit

S1 Exterior lamp switch

S144 Combination switch

E2e3 Standing and parking lamp, right

E3 Taillamp, left

E3e2 Tail lamp and parking lamp, left

E4 Taillamp, right

E4e2 Tail lamp and parking lamp, right

E19/1 License plate lamp, left

E19/2 License plate lamp, right

Automatic driving light actuation function

To activate the automatic driving light actuation, the rotary light switch (S1) is turned to the "automatic driving light actuation" position.

The automatic driving light actuation automatically switches the vehicle's driving lights on or off depending on the ambient brightness and weather situation. The light intensity value required for this function is recorded by the rain/light sensor (B38/2). This saves the driver from switching the lights on in inclement weather, darkness or when entering a tunnel.

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The type of driving lights (low beam or high beam) is dependent on the switch position of the headlamp flasher/high beam switch (S144s2) integrated in the combination switch (S144). The driving lights operate as follows:

 If the headlamp flasher/high beam switch (S144s2) of the combination switch (S144) is set to the "high beam" position, then driving lights and high beam are the same.

 If the headlamp flasher/high beam switch (S144s2) of the combination switch (S144) is set to the "low beam" position, then driving lights and low beam are the same.

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Exterior light behavior when starting a journey

Function at start of journey (in darkness)

 With the key removed Exterior lights "OFF"

 Circuit 15C ON Exterior lights "OFF"

 Circuit 15R ON Standing lamps "ON"

 Circuit 15 ON Standing lamps "ON"

 Circuit 61 ON Standing lamp and driving lights "ON"

Function at end of journey (in darkness)

 Circuit 61 OFF Standing lamp and driving lights "ON"

 Circuit 15 OFF Standing lamp and driving lights "ON"

 Circuit 15R OFF Standing lamps "ON"

 Circuit 15C OFF Standing lamps "ON"

 With the key removed Exterior lights "OFF"

At the start or end of a journey with daytime running lamps and excellent weather situation, the exterior lights are not automatically actuated.

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Networking of components

The components in the high beam function and the headlamp flasher function are networked as follows:

 The rotary light switch (S1) is read in directly by the SAM control unit (N10).

 The headlamp flasher/high beam switch (S144s2) of the combination switch (S144) is read in directly by the EIS [EZS] control unit (N73).

 The EIS [EZS] control unit (N73) sends the signals to the Controller Area Network bus Class B (interior) (CAN-B). These signals are read in by the SAM control unit (N10).

 The rain/light sensor (B38/2) is read in by the overhead control panel control unit (N70). The overhead control panel control unit (N70) stores the signals on the CAN-B bus. These signals are read in by the SAM control unit (N10).

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The following lights are actuated in the automatic driving light actuation function when required directly by the SAM control unit (N10):

 High beam, left (E1e1) of lamp unit, left front (E1)

 High beam, right (E2e1) of the lamp unit, right front (E2)

 Standing and parking lamp, left (E1e3) in the lamp unit, left front (E1)

 Standing and parking lamp, right (E2e3) in the lamp unit, right front (E2)

 Tail lamp and parking lamp, left (E3e2) in the taillamp, left (E3)

 Tail lamp and parking lamp, right (E4e2) in the taillamp, right (E4)

 Low beam, left (E1e2) of the lamp unit, left front (E1)

 Low beam, right (E2e2) of the lamp unit, right front (E2)

 License plate lamp, left (E19/1),

 License plate lamp, right (E19/2)

 When the high beam or headlamp flasher is active, the SAM control unit (N10) sends a signal to CAN-B. The instrument cluster (A1) receives this signal and actuates the high beam indicator lamp (A1e3).