Automatic driving light actuation, function

P82.10-3831-09

Shown on vehicle without code (615) bi-xenon headlamp unit with integral cornering lamp

1 Terminal status

2 Exterior lamp switch in "AUTO" position

3 Rain/light sensor detects "Darkness"

4 Terminal 61 ON

5 Engine speed

6 Position of combination switch

7 Actuation of left front driving lamp

8 Request for right front driving lamp

9 Actuation of right front driving lamp

10 Request for taillamp

11 Actuation of taillamp

G2 Alternator

N10/1 Driver-side SAM control unit with fuse and relay module

N10/2 Rear SAM control unit with fuse and relay module

N10/11 Passenger-side SAM control unit

N70 Overhead control panel control unit

N73 EIS [EZS] control unit

N80 Steering column module

N93 Central gateway control unit

S1 Exterior lamp switch

S4 Combination switch

CAN-B Controller Area Network Bus Class B (interior) (CAN-B)

B38/2 Rain/light sensor

E1e2 Left low beam

E1e3 Left standing and parking lamp

E2e2 Right low beam

E2e3 Right standing and parking lamp

E3e2 Outer left taillamp, parking lamp, rear fog lamp

E3e5 Inner left taillamp, rear fog lamp

E4e2 Outer right taillamp, parking lamp, rear fog lamp

E4e5 Inner right taillamp, rear fog lamp

E19/1 Left license plate lamp

E19/2 Right license plate lamp

Function requirements:

 Exterior lamp switch in "AUTO" position

Function at start of journey (in darkness)

 Key removed: exterior lights "Off"

 Circuit 15C: exterior lights "Off"

 Circuit 15R: standing lamp "On"

 Circuit 15: standing lamp "On"

 Circuit 61 or engine speed

> 300 rpm for t > 2 s: standing lamp and low beam
(high beam permissible) "On"

Function at end of journey (in darkness)

 Circuit 61 or engine speed

> 300 rpm for t > 2 s: standing lamp and low beam
(high beam permissible) "On"

 Circuit 15: standing lamp and low beam (high beam permissible) "On"

 Circuit 15R: standing lamp "On"

 Circuit 15C: standing lamp "On"

 Key removed: exterior lights "Off"

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Function

Monitoring the rain/light sensor and combination switch makes it possible for the overhead control panel control unit to activate the automatic driving light function. The rain/light sensor monitors the intensity of the daylight and the light conditions in the direction of travel.

Function when driving using the example of driving through a tunnel

The rain/light sensor signals the changed light conditions to the overhead control panel control unit. The overhead control panel control unit sends the "Driving lamps On" signal over CAN-B to the driver-side SAM control unit.
The signal is forwarded over CAN-B to the front passenger-side SAM control unit and to the rear SAM control unit.

The driver-side SAM control unit actuates the standing lamp as well as the low beam or high beam in the left front lamp unit (E1).

The passenger-side SAM control unit actuates the standing lamp as well as the low beam or high beam in the right front lamp unit (E2).

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The rear SAM control unit actuates the taillamps in the left taillamp (E3) and in the right taillamp (E4) as well as the license plate lamps.

If adequate lighting conditions are detected again, the driving and standing lamps are automatically switched off.

 The actuation of the low beam or high beam depends on the position of the combination switch.

Function during wiping operation

If the windshield wiper is active for at least 20 s with a cycle time < 6 s, the driving lamps are switched on as in the preceding example. If the cycle time is absent for 20 s, the driving lamps are switched off. With the functions of washing and one-touch wiping, the driving lamps are not switched on automatically.

When switching off circuit 15R or if the combination switch is set to "0" position, the driving lamps switch off immediately.