Headlight switch off delay function

Function requirements, general

 No overvoltage or undervoltage (operating voltage range between 8 volts to 17.5 volts)

 "Outer OFF delay" and "Locator lighting" function activated on radio (Audio/COMAND) (N87/6).

 The humidity sensor/light sensor/rain sensor/sun sensor (B38/3) or the humidity sensor/light sensor/rain sensor (B38/2) signals "Darkness recognized"

 Illumination switch (S1/2) in position "AUTO"

 The radio (Audio/COMAND) sends the status of the "Outer OFF delay" and "Locator lighting" function via the user interface CAN (CAN HMI), gateway for user interface CAN (N93/4), chassis CAN (CAN E), electronic ignition lock (EZS) control unit (N73), and interior CAN (CAN B) to the signal acquisition and actuation module (SAM) control unit (N10/1).
The ambient brightness is detected by the humidity sensor/light sensor/rain sensor/sun sensor or humidity sensor/light sensor/rain sensor. It directly reads in the signals of the light sensor, evaluates them, and sends the information on ambient brightness (twilight level) via the roof LIN (LIN B13) to the signal acquisition and actuation module (SAM) control unit.
The signal acquisition and actuation module (SAM) control unit directly reads in the status of the illumination switch.

Headlamp switch-off delay (SWA), general

The SWA is used for leaving and finding the vehicle safely in darkness.

 The SWA duration can be configured on the radio (Audio/COMAND) between 0 seconds and 60 second in 15-second steps.

The following light functions are activated here:

 Standing/parking lights actuation

 Detailed information on the standing/parking lights actuation is available in the separate subfunction "Standing/parking lights actuation, function".
During the SWA, the light sources are actuated with greater intensity and therefore emit more light than during standing/parking lights actuation.

 Ambient illumination with CODE LC5 (Ambient illumination in the outside mirrors) via left outside mirror ambient illumination (M21/4e2) in left outside mirror (M21/4) and right outside mirror ambient illumination (M21/5e2) in right outside mirror (M21/5)

 Ambient illumination via liftgate ambient illumination 1 (E20/3)

 Ambient illumination via liftgate ambient illumination (E20)

 Ambient illumination via left exit and warning lamp (E20/1) and right exit and warning lamp (E20/2)

The SWA function is comprised of the following subfunctions:

 Function sequence for SWA (outer OFF delay function)

 Function sequence for locator lighting (AFB)

 The headlamp switch-off delay and locator lighting functions run in parallel if necessary. An active headlamp switch-off delay (SWA) function is not terminated by a requested AFB function and vice versa.

Function sequence for SWA (outer OFF delay function)

The SWA function is activated by the driver after the engine has been switched off (change in circuit status from "Circuit 15 ON" to "Circuit 15R ON") for the configured period of time. The status of circuit 15 is sent by the electronic ignition lock (EZS) control unit via the interior CAN to the signal acquisition and actuation module (SAM) control unit.

The signal acquisition and actuation module (SAM) control unit then activates the standing/parking lights actuation.

On vehicles with CODE LC5 (Ambient illumination in the outside mirrors), the signal acquisition and actuation module (SAM) control unit sends the request to switch on the ambient illumination via interior CAN to the following control units:

 Left front door control unit (N69/3)

This directly actuates the left outside mirror ambient illumination.

 Right front door control unit (N69/4)

This directly actuates the right outside mirror ambient illumination.

In addition, the signal acquisition and actuation module (SAM) control unit directly actuates the liftgate ambient illumination and liftgate ambient illumination 1.

 The function starts again by opening a vehicle door. The liftgate is assessed as a vehicle door. If all vehicle doors are closed again, the function is restarted.
The status of the front doors is sent by the left front door control unit and the right front door control unit via the interior CAN to the signal acquisition and actuation module (SAM) control unit.
The active SWA is terminated by switching on circuit 15 or by triggering of an anti-theft alarm system (ATA [EDW]) alarm (with CODE FZ5 (Anti-theft alarm system) or with CODE FY1 (Theft protection package)).

Function sequence for locator lighting (AFB)

When unlocking the vehicle, the ambient illumination is switched on for a period of approx. 40 seconds (time for the automatic relocking).

The electronic ignition lock (EZS) control unit sends the status of the central locking via the interior CAN to the signal acquisition and actuation module (SAM) control unit.

The signal acquisition and actuation module (SAM) control unit then activates the standing/parking lights actuation.

On vehicles with CODE LC5 (Ambient illumination in the outside mirrors), the signal acquisition and actuation module (SAM) control unit sends the request to switch on the ambient illumination via interior CAN to the following control units:

 Left front door control unit

This directly actuates the left outside mirror ambient illumination.

 Right front door control unit

This directly actuates the right outside mirror ambient illumination.

In addition, the signal acquisition and actuation module (SAM) control unit directly actuates the liftgate ambient illumination and liftgate ambient illumination 1.