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Symbol and ambiance illumination, function - GF82.20-P-2100CE

MODEL 204 as of model year 2009/YoM 08 

Fig 1: Symbol And Ambiance Illumination Block Diagram (1 Of 2)
G10084710Courtesy of MERCEDES-BENZ USA
Fig 2: Symbol And Ambiance Illumination Block Diagram (2 Of 2)
G10084711Courtesy of MERCEDES-BENZ USA

Symbol and ambiance illumination in general 

The symbol and ambiance illumination feature provides the brightness-adjustable illumination of all controls as well as the indirect illumination of the vehicle interior.

Symbol and ambiance illumination encompasses the following subfunctions:

Additional symbol illumination function requirements 

Function sequence for symbol illumination 

The following information is read in and evaluated by the instrument cluster for controlling the symbol and function illumination:

The instrument cluster uses the incoming data to generate the circuit 58d signal and transmits it via the interior CAN to the following control units to actuate the symbol illumination:

The radio or COMAND controller unit receives the circuit 58d signal and sends it to the following components over the telematics CAN:

The front SAM control unit actuates the following components over the instrument panel LIN:

The front SAM control unit actuates the following components directly:

The front SAM control unit sends the circuit 58d signal over the chassis CAN to the following control units:

The CDI control unit or the ME-SFI [ME] control unit reads in the circuit 58d signal and sends it over the drive train CAN to the electronic selector lever module control unit (with transmission 722). The electronic selector lever module control unit reads in the circuit 58d signal and actuates the following components:

The steering column tube module control unit actuates the following components over the steering LIN and the steering wheel electronics:

The AAC control and operating unit actuates the symbol illumination of the integrated controls directly and sends the circuit 58d signal over the climate control LIN to the rear AAC operating unit (in model 204.0/2 with code (581) Comfort automatic air conditioning and code (954) Avantgarde or code (955) Elegance or model 204.9 with code (581) Comfort automatic air conditioning and code (876) Interior lights package).

The rear automatic air conditioning operating unit actuates the symbol illumination of the integrated controls.

The left front door control unit actuates the symbol illumination of the following components.

Actuation over left door LIN:

Direct actuation:

The right front door control unit actuates the symbol illumination of the following components.

Actuation over right door LIN:

Direct actuation:

Models 204.0/2/9:

The left rear door control unit actuates the symbol illumination for the left rear power window switch.

Models 204.0/2/9:

The right rear door control unit actuates the symbol illumination of the right rear power window switch.

IMPORTANT The symbol illumination for the controls located on the overhead control panel control unit (with code (414) Power glass tilting/sliding roof) is switched on when a vehicle door is opened without reception of the circuit 58d signal at a brightness value equivalent to 100%. If the status of the vehicle doors does not changes, the symbol illumination is switched off after t = 30 s. The opening or closing of a vehicle door while this time interval is running down causes it to start again. The symbol illumination is switched off immediately when the vehicle is locked. The symbol illumination is actuated to match the status of the light sensor (without code (345) Rain sensor) or the status of the rain/light sensor (with code (345) Rain sensor) with circuit 15R ON. For circuit 15 OFF the symbol illumination is actuated corresponding to the daytime (brightness) level.

Function sequence for ambiance illumination 

The ambiance illumination encompasses the actuation of different components for indirect illumination of the footwell, instrument panel and vehicle doors.

The brightness can be adjusted using the instrument illumination brightness control.

The following signals are read in and evaluated by the front SAM control unit over the interior CAN for controlling the ambiance illumination:

The front SAM control unit then transmits the request to switch on the ambiance illumination to the following control units via the interior CAN:

The front SAM control unit actuates the following ambiance illumination components:

The overhead control panel control unit on vehicles with code (414) Power glass tilting/sliding roof actuates the ambient lamp in the inside rearview mirror.

The left front door control unit actuates the following ambiance illumination components:

The right front door control unit actuates the following ambiance illumination components:

The left rear door control unit actuates the following ambiance illumination components:

The right rear door control unit actuates the following ambiance illumination components:

When the vehicle is unlocked using the central locking system, the ambiance illumination components are actuated with a dimmed brightness setting. If a front or rear door is now opened, the ambiance illumination components are actuated with a brightness setting that corresponds to 100%.

When the front or rear door is closed or if circuit 15R is enabled, the ambiance illumination components are actuated with the current brightness setting again. If the vehicle is locked using the central locking system, the ambiance illumination components are switched off immediately without dimming.

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic for symbol and ambiance illumination   PE82.20-P-2055-97FAA
  Overview of interior illumination (IBL) system components   GF82.20-P-9997CE 
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