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

Model 238 

Up To Model Year 2021 

Courtesy of MERCEDES-BENZ USA

Search and symbol illumination 

Courtesy of MERCEDES-BENZ USA

Ambient lighting (With Code 877 (Ambient lighting) or code 891 (Premium ambient lighting)) 

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 
• Ambient lighting function sequence (With Code 877 (Ambient lighting) or code 891 (Premium ambient lighting)) 

Function sequence for search and symbol illumination 

Activating the search 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 on 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 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 (except code 446 (touchpad only))
• Touchpad (with code 446 (Touchpad only) or with code 448 (Touchpad))

The Audio/COMAND control panel (except code 446 (Touchpad only)) or the touchpad (with code 446 (Touchpad only)) transmits the circuit 58d signal via the LCP-LIN to the following control panels, which subsequently actuate the integrated control elements:

• Upper control panel control unit
• Left lower control panel
• Right lower control panel

The electronic ignition lock control unit sends the circuit 58d signal via the chassis FlexRay to the steering column tube module control unit.

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

• Actuation via steering wheel CAN and steering wheel electronics (as of 01.06.2018) or via steering LIN and steering wheel electronics (up to 31.05.2018):
  • Instrument cluster multifunction steering wheel button group
  • Head unit multifunction steering wheel button group
• Direct actuation:
  • DIRECT SELECT lever (transmission 725)

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
• Rear control unit
• Trailer recognition control unit (with code 550 (Trailer hitch))
• Left front door control unit
• Right front door control unit
• Overhead control panel control unit

The electronic ignition lock control unit actuates the following component:

• KEYLESS GO start/stop button

The front SAM control unit actuates the following components:

• Direct actuation:
  • Exterior lights switch
  • Electric parking brake switch
  • Cigarette lighter with front ashtray illumination (with code 301 (Ashtray package/smoker package))
  • Center console armrest stowage compartment switch and controls illumination
  • Front center console cup holder illumination
  • Right front footwell lamp
  • Left front footwell lamp
• Actuation via the instrument panel LIN:
  • Analog clock
  • Driver's side instrument panel button group (with code 235 (Parking Pilot with PARKTRONIC) and code 489 (AIR BODY CONTROL) or code 23P (Driving Assistance Package) or code 243 (Active Lane Keeping Assist) or code 463 (Head-up Display))

The climate control, control unit actuates the search and symbol illumination of the following components via A/C operating LIN:

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

The rear control unit actuates the following components:

• Actuation through left rear LIN:
  • Left rear seat heater switch (with code 872 (Seat heater in rear))
• Actuation through right rear LIN:
  • Right rear seat heater switch (with code 872 (Seat heater in rear))
• Direct actuation:
  • Left rear power window switch
  • Right rear power window switch
  • Soft top control switch (model 238.4)
  • Load assist switch (model 238.4)

In vehicles with code 550 (trailer hitch), the trailer recognition control unit actuates the trailer hitch unlocking switch directly.

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 221 (Electrically adjustable left driver seat) or code 275 (Memory package))
• Direct actuation:
  • Trunk lid release button (except code 881 (Remote trunk closing))
  • Driver trunk lid control button (with code 881 (Remote trunk closing))
  • Left front door central locking interior switch

The right front door control unit actuates the following components:

• Actuation via right front door LIN:
  • Right front switch group, seat adjustment (with code 222 (Electrically adjustable right front seat) or code 275 (Memory package))
• Direct actuation:
  • Passenger-side power window switch
  • Right front door central locking interior switch

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

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

• Actuation via roof LIN:
  • Surround lamp in inside mirror
• Direct actuation:
  • Left overhead control panel light-emitting diode (model 238.4)
  • Right overhead control panel light-emitting diode (model 238.4)
  • Emergency call system button group (model 238.4 with code 351 (Emergency call system (HERMES)))
  • Rear passenger compartment dome lamp ambient lighting in the rear passenger compartment dome lamp (for model 238.3 standard equipment, for model 238.4 with code 877 (Ambient lighting) or code 891 (Premium ambient lighting))
  • Glasses compartment illumination (model 238.4)

    The overhead control panel control unit directly actuates the eyeglasses box illumination irrespective of the circuit 58d signal from a circuit 15R ON status onwards.

Trunk lid control button (With Code 881 (Remote trunk closing)): 

If the trunk lid is open, the rear SAM control unit actuates the trunk lid control button at the trunk lid directly, irrespective of the circuit 58d signal. The rear SAM control unit independently evaluates the status of the trunk lid (open or closed).

Trunk lid emergency opening switch symbol illumination (With Code 494 (USA version)): 

The rear SAM control unit actuates the trunk lid emergency opening switch directly 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).

Ambient lighting function sequence (With Code 877 (Ambient lighting) or code 891 (Premium ambient lighting)) 

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
• "Displays" zone, illumination of instrument cluster and Audio/COMAND display
• "Rear" zone, rear area
• "Complete" zone, all areas

The luminosity can be set in several stages. Several different colors can be selected.

Model 238

up to model year 2021

with code 464 (Instrument cluster 12.3" diagonal)

Certain color and brightness setting combinations (color values) can be stored assigned to the instrument cluster's display style (SPORT, CLASSIC, PROGRESSIVE). Thus an assigned ambient lighting color value can be activated by selecting a display style in the instrument cluster. As of 01.06.2018 it can be adjusted in the instrument cluster whether this assignment should go ahead.

The head unit transmits the relevant information about these settings via the user interface CAN, the electronic ignition lock control unit and the interior CAN to the ambiance illumination control unit.

After a vehicle door is opened, the ambiance illumination 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 ambiance illumination control unit.

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

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

The ambient lighting control unit evaluates all incoming information and then actuates the following component parts:

Over left front door ambient lighting LIN:

• Left front door, door handle illumination
• Left front door ambiance illumination
• Left front door stowage compartment illumination
• Driver side air vent ambient lighting (with code 891 (Premium ambient lighting))
• Front passenger side air vent ambient lighting (with code 891 (Premium ambient lighting))
• Driver outside center air vent ambient lighting (with code 891 (Premium ambient lighting))
• Driver inside center air vent ambient lighting (with code 891 (Premium ambient lighting))
• Front passenger outside center air vent ambient lighting (with code 891 (Premium ambient lighting))
• Front passenger inside center air vent ambient lighting (with code 891 (Premium ambient lighting))

The left front door ambiance illumination LIN is looped via the left front door control unit.

Over right front door ambient lighting LIN:

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

The right front door ambiance illumination LIN is looped via the right front door control unit.

Over cockpit ambient lighting LIN:

• Left front center console ambiance illumination (transmission 725)
• Right front center console ambiance illumination (transmission 725)
• Inner upper digital instrument cluster full display ambient lighting (with code 464 (Digital instrument cluster full display))
• Outer upper digital instrument cluster full display ambient lighting (with code 464 (Digital instrument cluster full display))
• Inner lower digital instrument cluster full display ambient lighting (with code 464 (Digital instrument cluster full display))
• Outer lower digital instrument cluster full display ambient lighting (with code 464 (Digital instrument cluster full display))

Over vehicle interior ambient lighting LIN:

• Driver-side ambiance illumination
• Passenger-side interior ambiance illumination
• Passenger-side exterior ambiance illumination
• Right front footwell lamp
• Left front footwell lamp
• Right rear footwell lamp
• Left rear footwell lamp
• Front center console cup holder illumination

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-2054-97DCA
	Electrical function schematic ambient lighting	Model 238 up to model year 2021 with code 877 (Ambient lighting) Model 238 up to model year 2021 with code 891 (Premium ambiance illumination)	PE82.20-P-2053-97DCA
	Overview of interior illumination (IBL) system components		GF82.20-P-9997FH