Automatic driving light actuation, function

P82.10-3983-09

Shown without code (494) USA version

1 Terminal status

2 Exterior lamp switch in "AUTO" position

3 Rain/light sensor detects "Darkness"

4 Terminal 61 ON

5 Position of combination switch

6 Actuation of standing lamps

7 Low beam actuation

B38/2 Rain/light sensor

E1e2 Left low beam

E1e3 Left standing and parking lamp

E1n2 Xenon headlamp ignition module

E1n4 Xenon headlamp supply module

N10/8 Rear SAM control unit with fuse and relay module 2

N10/9 Passenger-side SAM control unit with fuse and relay module

N70 Front 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)

CAN-C Controller Area Network Bus
Class C (engine compartment) (CAN-C)

E2e2 Right low beam

E2e3 Right standing and parking lamp

E2n2 Xenon headlamp ignition module

E2n4 Xenon headlamp supply module

E3e2 Left taillamp and parking lamp

E4e2 Right taillamp and parking lamp

E19/1 Left license plate lamp

E19/2 Right license plate lamp

G2 Alternator

N3/10 ME control unit

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

N10/3 Rear SAM control unit with fuse and relay module 1

Function requirements:

 Exterior lamp switch (S1) in "AUTO" position

Function when starting a trip (in darkness)

 Transmitter key removed: exterior lights "Off"

 Circuit 15C: exterior lights "Off"

 Circuit 15R: standing lamps "On"

 Circuit 15: standing lamps "On"

 Term. 61 Standing lamps and low beam
(high beam permissible) "On"

Function when ending a trip (in darkness)

 Term. 61 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"

 Transmitter key removed: exterior lights "Off"

-----------------------------------------------------------------------------------------

Function

Monitoring the rain/light sensor (B38/2) and the combination switch (S4) makes it possible for the front overhead control panel control unit (N70) to trigger the automatic driving light actuation. The rain/light sensor (B38/2) monitors the intensity of the daylight and the light conditions in the direction of travel.

Function while driving, using driving in a tunnel as an example

The rain/light sensor (B38/2) informs the front overhead control panel control unit (N70) that the light conditions have changed. The front overhead control panel control unit (N70) transmits the "Darkness detected" signal to the driver-side SAM control unit with fuse and relay module (N10/1) via CAN-B (CAN-B).

The driver-side SAM control unit with fuse and relay module (N10/1) processes the "Darkness detected" signal and forwards the "Driving lamps On" request signal via CAN-B (CAN-B) to the passenger-side SAM control unit with fuse and relay module (N10/9), the rear SAM control unit with fuse and relay module 1 (N10/3), and the rear SAM control unit with fuse and relay module 2 (N10/8).

-----------------------------------------------------------------------------------------

The driver-side SAM control unit with fuse and relay module (N10/1) actuates the left standing and parking lamp (E1e3) as well as the left low beam (E1e2) or the left high beam in the left front lamp unit via the xenon headlamp supply module (E1n4) and the xenon headlamp ignition module (E1n2).

The passenger-side SAM control unit with fuse and relay module (N10/9) actuates the right standing and parking lamp (E2e3), as well as the right low beam (E2e2) or the right high beam in the right front lamp unit via the xenon headlamp supply module (E2n4) and the xenon headlamp ignition module (E2n2).

The rear SAM control unit with fuse and relay module 1 (N10/3) actuates the left license plate lamp (E19/1) and the right license plate lamp (E19/1).

The rear SAM control unit with fuse and relay module 2 (N10/8) actuates the left taillamp and parking lamp (E3e2) and the right taillamp and parking lamp (E4e2).

When adequate light conditions are recognized again, the driving and standing lamps are switched off automatically.

 The actuation of the low beam or high beam depends on the position of the combination switch (S4).

Function during wiper operation

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

When switching off circuit 15R or when the combination switch (S4) is turned into position "0", the driving lamps are switched off immediately.