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Automatic Interior Lights Control, Function - GF82.20-P-2200GWM

Model 463 (except 463.342) 

as of model year 2019 

G13669636Courtesy of MERCEDES-BENZ USA

Show on model 463 

Function requirements, general 

Automatic interior lights control in general 

The automatic interior lights control actuates all the components of the interior illumination (IBL). The appropriate requests are generated automatically. The master control unit for the automatic interior lights control is the front SAM control unit.

The automatic interior lights control function encompasses the following subfunctions:

Additional function requirement for locator lighting 

IMPORTANT The overhead control panel control unit directly reads in the status of the interior lamp automatic function button and sends it to the front SAM control unit over the interior CAN.

Locator lighting function sequence 

When unlocking the vehicle via radio, the front SAM control unit activates the locator lighting.

The electronic ignition lock control unit sends the status of the central locking (CL [ZV]) to the front SAM control unit via interior CAN. Then the front SAM control unit transmits the request to switch on the interior illumination via the interior CAN to the overhead control panel control unit.

The overhead control panel control unit then actuates the following components directly:

The overhead control panel control unit actuates the following components over the roof-LIN:

IMPORTANT If the ambient illumination function is activated through the instrument cluster, it automatically switches itself on through the central locking when the vehicle is unlocked. This leads to the fact that the search and symbol illumination is switched on. The symbol and ambiance illumination function is described in a separate document.

Additionally, the front SAM control unit transmits the request to switch on the footwell lamp to the ambient lighting control unit via the interior CAN. The ambient lighting control unit then actuates the following component parts:

Over cockpit ambient lighting LIN:

Via the rear passenger compartment footwell ambient lighting LIN:

When the central locking is unlocked, all lamps are switched off after expiration of 40 s or immediately if the vehicle is locked again within 3 s after unlocking it.

Additional function requirements for orientation lighting 

Function sequence for orientation lighting 

When circuit 15C is switched off, the front SAM control unit activates the orientation lighting.

The instrument cluster sends the vehicle speed to the front SAM control unit over the user interface CAN (CAN HMI), electronic ignition lock control unit and interior CAN.

The Supplemental Restraint System control unit transmits the status of the driver seat belt buckle via the user interface CAN, the electronic ignition lock control unit and the interior CAN to the front SAM control unit.

Then the front SAM control unit transmits the request to switch on the interior illumination via the interior CAN to the overhead control panel control unit.

The overhead control panel control unit then actuates the following components directly:

The overhead control panel control unit actuates the following components over the roof-LIN:

The front SAM control unit transmits the request to switch on the ambient lighting to the ambient lighting control unit via the interior CAN.

The ambiance illumination control unit then actuates the following components over the vehicle interior ambiance illumination-LIN:

When the vehicle doors are closed, all lights that are switched on are switched off once the OFF delay time has expired. The OFF delay time can be switched on or off using the "Settings" menu in the head unit.

The corresponding selection is sent by the head unit via user interface CAN, electronic ignition lock control unit and interior CAN to the front SAM control unit.

Additional function requirements for warning and exit illumination 

IMPORTANT The overhead control panel control unit directly reads in the status of the interior lamp automatic function button and sends it to the front SAM control unit over the interior CAN.

Function sequence for warning and exit illumination 

When a vehicle door is opened, the front SAM control unit activates the warning and exit illumination.

The front door control unit transmit the status of the front doors (open or closed) to the front SAM control unit via interior CAN.

The rear door control unit transmit the status of the rear doors (open or closed) to the front SAM control unit via interior CAN.

The front SAM control unit evaluates all incoming information and sends the request to switch on the interior illumination to the overhead control panel control unit over the interior CAN.

The overhead control panel control unit actuates the following components directly:

The overhead control panel control unit actuates the following components over the roof-LIN:

The front SAM control unit also transmits the request to switch on the warning and exit illumination to the following control units via the interior CAN:

Depending on which vehicle door has been opened, the following components of the warning and exit illumination are actuated:

The front SAM control unit transmits the request to switch on the ambient lighting to the ambient lighting control unit via the interior CAN.

The ambiance illumination control unit then actuates the following components over the vehicle interior ambiance illumination-LIN:

The front SAM control unit actuates the following component parts of the entrance illumination directly:

The illuminated door sill moldings are actuated with different maximum values depending on the ambient brightness. The ambient brightness is detected by the light sensor. The rain/light sensor with additional functions reads in the signals of the light sensor directly, evaluates them and transmits information about the ambient brightness (dimness level) via the rain/light sensor LIN to the front SAM control unit.

IMPORTANT To preserve the on-board electrical system battery (G1), with circuit 15 Off all the activated lamps are switched off after 5 min. When a vehicle door is open and 8 s after the closing of the last vehicle door.

Function sequence for interior lighting for ATA alarm (with code FZ5 (Anti-theft alarm system) or code FZ8 (Alarm system)) 

Immediately after triggering an ATA [EDW] alarm, the front SAM control unit activates the following interior illumination functions:

Additional function requirement for interior illumination after an accident 

IMPORTANT A stationary vehicle is defined via the vehicle speed. The instrument cluster sends the vehicle speed to the front SAM control unit over the user interface CAN (CAN HMI), electronic ignition lock control unit and interior CAN.

Function sequence for interior illumination after an accident 

After an accident with airbag deployment, the front SAM control unit activates the interior illumination.

The interior illumination is actuated in order to provide better orientation for the vehicle occupants and the first aiders following an accident.

If the supplemental restraint system control unit recognizes an accident event, its sends the crash signal to the front SAM control unit over the user interface CAN, electronic ignition lock control unit and interior CAN.

The front SAM control unit additionally recognizes an accident event by evaluating the signals of the integrated crash sensor.

The front SAM control unit evaluates all incoming information and activates the following interior illumination functions:

  Automatic interior lights control electrical function schematic   PE82.20-P-2052-97ZGC
  Overview of interior illumination (IBL) system components   GF82.20-P-9997GW 
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