Symbol And Ambiance Illumination, Function - GF82.20-P-2100RF

Model 205 up to model year 2019 

Model 253 (except 253.99) up to model year 2020 

Courtesy of MERCEDES-BENZ USA

Search and symbol illumination 

Courtesy of MERCEDES-BENZ USA

Ambiance illumination (with CODE 877 (Ambiance illumination)) 

Function requirements, general 

• No overvoltage or undervoltage

Symbol and ambiance illumination in general 

The symbol and ambiance illumination feature provides the brightness-adjustable illumination of all controls as well as the illumination of the vehicle interior. Symbol and ambiance illumination encompasses the following subfunctions:

• Function sequence for search and symbol illumination 
• Function sequence for ambiance illumination (with CODE 877 (Ambiance illumination)) 

Function sequence for search and symbol illumination 

Activating the switch and controls and symbol illumination makes it easier for the driver to find important controls and to look for objects in the vehicle without having to switch on the ignition or the exterior lights. The search and symbol illumination is switched on by unlocking the vehicle remotely, by opening a vehicle door or by changing the status of circuit 15. The luminosity to be used to implement the search and symbol illumination can be continuously adjusted using the instrument illumination brightness control in the exterior lights switch. The front SAM control unit reads in the signals from the instrument illumination brightness control directly and sends them via interior CAN, electronic ignition lock control unit and user interface CAN to the instrument cluster.

After unlocking the vehicle or opening a vehicle door, the search and symbol illumination is switched on with 100 % luminosity.

The electronic ignition lock control unit sends the status of the central locking system and the status of circuit 15 over the user interface CAN to the instrument cluster.

The front door control units send the status of the front doors (open or closed) via interior CAN, electronic ignition lock control unit and user interface CAN to the instrument cluster.

The status of the rear doors (model 205.0/1/2, 253) (open or closed) is sent by the rear door control units via the interior CAN, electronic ignition lock control unit, and user interface CAN to the instrument cluster.

The instrument cluster evaluates all incoming information, generates the circuit 58d signal and transmits it via the user interface CAN to the following control units to activate the search and symbol illumination:

• Electronic ignition switch control unit
• Head unit

The head unit activates the integrated controls and sends the circuit 58d signal over the telematics CAN to the following control units, which then switch on the integrated controls:

• Audio/COMAND display
• Audio/COMAND control panel
• Touchpad (with code 448 (Touchpad))

The Audio/COMAND operating unit sends the circuit 58d signal over the LCP-LIN to the switch panels, which then actuate the integrated control elements:

• Left lower control panel
• Right lower control panel

The electronic ignition lock control unit sends the circuit 58d signal over the chassis FlexRay to the following control units:

• Steering column module control unit
• Electronic Stability Program control unit

The steering column tube module control unit actuates the following components:

• Actuation via steering LIN and the steering wheel electronics:
  • Left multifunction steering wheel button group
  • Right multifunction steering wheel button group
• Direct actuation:
  • DIRECT SELECT lever (transmission 722, 724, 725)
  • Right rear footwell lamp (with CODE 876 (Interior lights package))
• Actuation via the instrument panel LIN:
  • Analog clock (model 205 as of 01.06.2016 with code 246 (Analog clock) or model 205 up to 31.05.2016)
  • Driver side instrument panel button group (with code 235 (Active Parking Assist with PARKTRONIC), code 238 (Active Lane Keeping Assist), code 266 (DISTRONIC PLUS with Steer Assist and Stop & Go Pilot), code 463 (Head-up display) or code 501 (360° camera))
• Actuation via roof LIN:
  • Overhead control panel control unit

The overhead control panel control unit directly actuates the switch, controls and symbol illumination of the integrated controls and the following components:

• Surround lamp in inside mirror
• Left overhead control panel LED
• Right overhead control panel LED
• Rear ambiance illumination dome lamp in the rear dome lamp (model 205.3 with code 876 (Interior lights package))
• Emergency call system button group (model 205.4 with code 351 (Emergency call system (HERMES))

Model 205 up to model year 2019 with code 876 (Interior Light package)

Model 253 (except 253.99) up to model year 2020 with code 876 (Interior Light package)

The eyeglass box illumination is powered by the overhead control panel control unit irrespective of the circuit 58d signal. The eyeglasses box illumination is actuated as of circuit 15R ON.

The climate control, control unit actuates the switch and controls and symbol illumination of the following operating units via climate control LIN:

• Climate control operating unit
• Rear air conditioning operating unit (with code 581 (Automatic air conditioning))

The left front door control unit actuates the following components:

• Actuation via left front door LIN:
  • Driver-side power window and outside mirror adjustment switch group
  • Left front switch group, seat adjustment (with CODE 275 (Memory package) or CODE 221 (Electrically adjustable left driver seat))
• Direct actuation:
  • Left front door handle illumination (with CODE 876 (Interior lights package))
  • Trunk lid release button (model 205.0/1/3/4 except CODE 881 (Remote trunk closing))
  • Driver trunk lid/liftgate control button (model 205.0/1/3/4 with CODE 881 (Remote trunk closing), model 205.2, 253 with CODE 890 (EASY-PACK liftgate))

The Electronic Stability Program control unit directly actuates the electrical parking brake switch on model 205 (except 205.086/087/286/287/386/387/486/487), 253.

On model 205.086/087/286/287/386/387/486/487, the electronic ignition lock control unit sends the circuit 58d signal via the periphery CAN to the electric parking brake control unit. The electric parking brake control unit actuates the electric parking brake switch directly. The electronic ignition lock control unit sends the circuit 58d signal via interior CAN to the following control units:

• Front SAM control unit
• Climate control, control unit
• Left front door control unit
• Right front door control unit
• Left rear door control unit (model 205.0/1/2.253)
• Right rear door control unit (model 205.0/1/2, 253)

The front SAM control unit actuates the following components:

• Direct actuation:
  • Exterior lights switch
  • Cigarette lighter with front ashtray illumination (with code 301 (Ashtray package/smoker package))
  • Stowage compartment illumination (with CODE 876 (Interior lights package))
  • Cup holder ambiance illumination in front center console (with CODE 876 (Interior lights package))
  • Front right footwell lamp (with CODE 876 (Interior light package))
  • Left front footwell lamp (with CODE 876 (Interior lights))
  • Left rear footwell lamp (with CODE 876 (Interior lights package))
  • Left front door central locking interior switch

The right front door control unit actuates the following components:

• Actuation via right front door LIN:
  • Front right switch group, seat adjustment (with CODE 242 (Electrically adjustable front passenger seat with memory function) or CODE 222 (Electrically adjustable right front seat))
• Direct actuation:
  • Right front door handle illumination (with CODE 876 (Interior lights package))
  • Passenger-side power window switch
  • Right front door central locking interior switch

The left rear door control unit (model 205.0/1/2, 253) directly actuates the following components:

• Left rear door handle illumination (with CODE 876 (Interior lights package))
• Left rear power window switch

The right rear door control unit (model 205.0/1/2, 253) directly actuates the following components:

• Right rear door handle illumination (with CODE 876 (Interior lights package))
• Right rear power window switch

The door handle illumination is actuated after circuit 15C has been switched off for an additional t = 2 min (run-on).

Trunk lid/liftgate control button symbol illumination (model 205.0/1/3/4 with CODE 881 (Remote trunk closing), model 205.2, 253 with CODE 890 (EASY-PACK liftgate)) 

The trunk lid/liftgate control button on the trunk lid or on the liftgate is supplied with power by the rear SAM control unit when the trunk lid or liftgate is open irrespective of the circuit 58d signal. The rear SAM control unit independently evaluates the status of the trunk lid or the liftgate (open or closed).

Symbol illumination for trunk lid emergency opening switch (model 205 0/1/3/4 with CODE 494 (USA version)) 

The trunk lid emergency opening switch is powered by the rear SAM control unit irrespective of the circuit 58d signal. The trunk lid emergency opening switch is actuated with a frequency of F = 1 Hz after the trunk lid has been closed for t = 60 min and flashes green. The rear SAM control unit independently evaluates the status of the trunk lid (open or closed).

Function sequence for ambiance illumination (with CODE 877 (Ambiance illumination)) 

The ambient lighting is switched on by unlocking the vehicle remotely, by opening a vehicle door or by changing the status of circuit 15. In the process, different areas of the vehicle interior are illuminated indirectly. The luminosity and the color in which the ambiance illumination is to be designed can be adjusted using a corresponding menu in the head unit. Different zones can also be defined using this menu.

The following zones can be selected:

• "Front" zone, driver and front passenger area
• "Rear" zone, rear area
• "Complete" zone, all areas

The luminosity can be set in five stages. Seven different colors can be selected.

The head unit sends the corresponding information about these settings over the user interface CAN, electronic ignition lock control unit and interior CAN to the front SAM control unit.

After a vehicle door is opened, the ambient lighting is actuated with 100 % luminosity.

The electronic ignition lock control unit sends the status of the central locking and the status of circuit 15 via interior CAN to the front SAM control unit.

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 status of the rear doors (model 205.0/1/2, 253) (open or closed) is sent by the rear door control units via the interior CAN to the front SAM control unit.

The ambiance illumination is deactivated t = 3 s if the vehicle is locked.

The front SAM control unit evaluates all of the incoming information and transmits the request to switch on the ambient illumination via interior CAN to the following control units:

• Left front door control unit
• Right front door control unit
• Left rear door control unit (model 205.0/1/2.253)
• Right rear door control unit (model 205.0/1/2, 253)

The front SAM control unit actuates the following components directly:

• Right front footwell lamp
• Left front footwell lamp
• Left rear footwell lamp
• Right rear footwell lamp
• Left front illuminated door sill molding
• Right front illuminated door sill molding
• Left rear illuminated door sill molding (model 205.1)
• Right rear illuminated door sill molding (model 205.1)
• Front center console cup holder ambiance illumination
• Left front center console ambiance illumination
• Right front center console ambiance illumination
• Driver-side ambiance illumination
• Passenger-side interior ambiance illumination
• Passenger-side exterior ambiance illumination

The illuminated door sill moldings are actuated with different maximum values when the corresponding door is opened as a function of 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.

The front SAM control unit sends the request to switch on the ambient lighting via roof LIN to the overhead control panel control unit.

With model 205.3, the overhead control panel control unit actuates the rear dome lamp ambiance illumination in the rear dome lamp directly. The left front door control unit actuates the following components directly:

• Left front door, door handle illumination
• Left front door ambiance illumination
• Left front door stowage compartment illumination

The right front door control unit actuates the following components directly:

• Right front door, door handle illumination
• Right front door ambiance illumination
• Right front door stowage compartment illumination

The left rear door control unit (model 205.0/1/2, 253) directly actuates the following components:

• Left rear door, door handle illumination
• Left rear door ambiance illumination
• Left rear door stowage compartment illumination (model 205.1)

The right rear door control unit (model 205.0/1/2, 253) directly actuates the following components:

• Right rear door, door handle illumination
• Right rear door ambiance illumination
• Right rear door stowage compartment illumination (model 205.1)

The door handle illumination is actuated after circuit 15C has been switched off for an additional t = 2 min (run-on).

	Search and symbol illumination electrical function schematic		PE82.20-P-2054-97FBA
	Electrical function schematic ambient lighting	Model 205 up to model year 2019 with code 877 (ambient lighting) Model 253 (except 253.99) up to model year 2020 with code 877 (ambient lighting)	PE82.20-P-2053-97FBA
	Overview of interior illumination (IBL) system components		GF82.20-P-9997RF