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Automatic interior lights control, function - GF82.20-P-2200FLA

MODEL 212 with CODE 414 (Power glass tilting/sliding roof) 

Fig 1: Automatic Interior Lights Control Function Diagram - Model 212
G10050521Courtesy of MERCEDES-BENZ USA

Function requirements for automatic interior lights control, general 

Automatic interior lights control in general 

The automatic interior lights control implements the actuation of all components of the interior illumination (IBL), the warning and exit illumination and the load compartment illumination. 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 requirements for locator lighting 

Locator lighting function sequence 

The following signals are read in and evaluated by the front SAM control unit for controlling the locator lighting feature:

The front SAM control unit sends the request to switch on the interior illumination via interior CAN to the overhead control panel control unit. The overhead control panel control unit then actuates the following components:

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

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 causes the "Standing lights actuation active" signal to be set, which also activates the search and symbol illumination. The search and symbol illumination function is described in a separate document.

On vehicles with code (954) Avantgarde or code (955) Elegance the front SAM control unit actuates the following components in accordance with a defined brightness value:

Additional function requirements for orientation lighting 

Function sequence for orientation lighting 

The front SAM control unit reads in and evaluates the following signals for control of the orientation lighting:

After circuit 15C is switched off, the front SAM control unit sends the request to switch on the orientation lighting via interior CAN to the overhead control panel control unit, which then actuates the following interior illumination components:

On vehicles with code (954) Avantgarde or code (955) Elegance the front SAM control unit also actuates the following components in accordance with a defined brightness value:

If leaving the vehicle intentionally, all the lamps are switched off after t = 15 s. The OFF delay time can be switched on or off via the "Settings" menu in the instrument cluster. The respective selection is sent by the instrument cluster via the interior CAN to the front SAM control unit.

Function sequence for warning and exit illumination 

The warning and exit illumination is activated by opening a vehicle door.

In order to control the warning and exit illumination, the front SAM control unit reads in and evaluates the following signals:

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

The following components of the warning and exit illumination are actuated directly according to the door status:

Model 212.074/077/092/274/277/292:

The front SAM control unit also sends the request to switch on the warning and exit illumination via chassis CAN (up to 28.2.13) or chassis CAN 1 (as of 1.3.13) to the transmission mode control unit.

The transmission mode control unit then actuates the following components in accordance with the door status:

IMPORTANT The front illuminated door sill molding voltage converters supply the front illuminated door sill moldings with voltage. The luminescent films for the front illuminated door sill moldings operate at an operating voltage of U = 130 V. The power supply for the front illuminated door sill moldings is interrupted after a maximum period of t = 5 minutes.

If, as the result of a malfunction at the front illuminated door sill moldings, a front illuminated door sill molding voltage converter detects a load that is either too high or too low, it switches off the high-voltage output immediately for safety reasons.

The overhead control panel control unit actuates the following interior illumination components in accordance with the status of the interior lamp automatic function switch:

All the footwell lamps are also actuated by the front SAM control unit. If all the vehicle doors are closed again and the circuit status of circuit 15 On has been supplied by the electronic ignition lock control unit on the interior CAN, then the interior lights are switched off. The footwell lamps are then actuated again at the defined brightness value.

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

Additional load compartment illumination function requirements 

Function sequence for load compartment illumination 

To control the cargo area illumination, the front SAM control unit reads in the following signals and evaluates them:

The front SAM control unit transmits the request to switch on the load compartment illumination via the interior CAN to the rear SAM control unit, which then actuates the following load compartment illumination components:

IMPORTANT To preserve the on-board electrical system battery, the ambient lamps and the trunk lamps are switched off t = 10 min. after the trunk lid or liftgate has been opened.

The status of the front doors is sent to the rear SAM control unit by the front door control units and the current status of circuit 15 is provided by the electronic ignition lock control unit via interior CAN so that once a journey is over and the trunk lid is opened or the liftgate is opened the cargo area illumination can be activated again. The ambient lamps and the trunk lamps are switched off after the trunk lid or the liftgate is closed.

Additional function requirements for interior illumination with ATA [EDW] alarm (with code (551) Anti-theft alarm system (ATA [EDW])) 

Function sequence for interior illumination with ATA [EDW] alarm (with code (551) Anti-theft alarm system (ATA [EDW])) 

The interior illumination is activated immediately after an anti-theft alarm system alarm is triggered. The rear SAM control unit transmits the "ATA [EDW] alarm triggered" signal via interior CAN to the front SAM control unit. The front SAM control unit receives this signal, generates from it the request to switch on the interior illumination and transmits this to the overhead control panel control unit via the interior CAN.

The overhead control panel control unit then actuates the following interior illumination components:

Furthermore, the front SAM control unit actuates all footwell lamps.

Additional function requirements for interior illumination following an accident with airbag deployment 

Function sequence for interior illumination following an accident with airbag deployment 

The interior illumination is actuated in order to provide better orientation for the occupants and the first air personnel following an accident. If the supplemental restraint system control unit detects an accident event, it sends the crash signal via chassis CAN (up to 28.2.13) or chassis CAN 1 (as of 1.3.13) to the front SAM control unit. The instrument cluster sends the vehicle speed to the front SAM control unit via interior CAN. The front SAM control unit receives this, evaluates it and transmits the request to switch on the interior illumination to the overhead control panel control unit via the interior CAN.

The overhead control panel control unit receives this and actuates the following components:

The footwell lamps are also actuated by the front SAM control unit. The interior illumination function following an accident with airbag deployment is deactivated under the following conditions:

  Automatic interior lights control electrical function schematic MODEL 212 with CODE 414 (Power glass tilting/sliding roof) PE82.20-P-2052-97DAB
  Overview of interior illumination (IBL) system components   GF82.20-P-9997FL 
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