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

MODEL 166 up to model year 2016 

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 switch and controls and symbol illumination 
• Function sequence for ambiance illumination (with CODE 876 (Interior lights package)) 

Additional function requirements, search and symbol illumination 

• Standing light ON (circuit 58 ON)

Function sequence for switch and controls and symbol illumination 

In order to control the search and symbol illumination, the instrument cluster reads in the following signals and evaluates them:

• Status of standing lights actuation, sent to the interior CAN by the SAM control unit
• Instrument illumination brightness control status (continuous adjustment of switch and controls and symbol illumination brightness)

If the ambient illumination function is activated via the instrument cluster, it automatically switches itself on when the vehicle is unlocked using central locking (CL [ZV]). This causes "Standing lights actuation active" status to be set, which also activates the search and symbol illumination. If the driver door is then opened, the ambient illumination goes off. "Standing lights actuation active" status is canceled, and the instrument cluster deactivates the search and symbol illumination.

The controls in the vehicle are illuminated again only after circuit 15R is then switched on.

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

• Radio or COMAND controller unit
• SAM control unit
• Automatic air conditioning control and operating unit
• Left front door control unit
• Right front door control unit
• Left rear door control unit
• Right rear door control unit
• RCP [HBF] control unit (with CODE 581 (Comfort automatic air conditioning) or with CODE 872 (Electric seat heater for left and right rear seat))
• Electronic ignition switch control unit

The radio or the COMAND controller unit sends the signal for circuit 58d over the telematics CAN to the Audio/COMAND control panel. The SAM control unit actuates the following components:

• Actuation via center console switch-LIN:
  • Lower control panel control unit
  • Off-road control panel control unit (with CODE 430 (On & off-road package))
• Actuation via roof LIN:
  • Overhead control panel control unit
• Actuation via battery sensor LIN:
  • Upper control panel control unit
• Actuation via the instrument panel circuit 58d connector sleeve (Z50/1):
  • Exterior lights switch
  • Electric parking brake switch

With CODE 876 (Interior lights package):

• Left center air outlet symbol illumination
• Left front side air outlet symbol illumination
• Right front side air outlet symbol illumination
• Right center air outlet symbol illumination
• Actuation via the center console wiring harness connector sleeve, circuit 58d (Z61/7):
  • Front center console cup holder illumination (with CODE 876 (Interior lights package) and except CODE 311 (Temperature-controlled cup holder))
  • Center console armrest stowage compartment switch and controls illumination
  • Ashtray illumination (with CODE 301 (Ashtray package/smoker package))
  • Cup holder illumination (with CODE 876 (Interior lights package) and CODE 311 (Temperature-controlled cup holder))
  • Cup holder button (with CODE 311 (Temperature-controlled cup holder))

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

• Ambient lamp
• Rear dome lamp (model 166.8 with CODE 876 (Interior lights package))
• Anti-theft alarm system/emergency call system button group (with CODE 882 (Interior monitoring (only with ATA) [EDW]) or CODE 359 (TELEAID emergency call system) or CODE 348 (Emergency call/assist system))

The automatic air conditioning control and operating unit directly actuates the switch and controls and symbol illumination of the integrated controls.

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
  • Switch group, left front seat adjustment (with CODE 275 (Memory package (driver seat, steering column, mirror)))
• Direct actuation:
  • Left front door door handle illumination
  • Driver trunk lid/liftgate control button
  • Pop-out window switch (model 166.8)
  • 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 P64 (Memory package))
• Direct actuation:
  • Right front door door handle illumination
  • Passenger-side power window switch
  • Right front door central locking interior switch

The left rear door control unit actuates the following components directly:

• Left rear door door handle illumination
• Left rear power window switch

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

• Right rear door door handle illumination
• Right rear power window switch

The door handle illumination is actuated with a fixed dimming value with circuit 15R ON and implausible circuit 58d signal. The circuit status circuit 15 is transmitted by the electronic ignition lock control unit via the interior CAN to the respective control units.

The RCP [HBF] control unit (with CODE 581 (Comfort automatic air conditioning) or CODE 872 (Electric seat heater for left and right rear seat)) actuates the switch and controls and symbol illumination of the integrated controls directly.

The electronic ignition lock control unit sends the signal for the circuit 58d over the chassis CAN to the steering column tube module control unit.

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

• Actuation via steering LIN and steering wheel electronics:
  • Left multifunction steering wheel button group
  • Right multifunction steering wheel button group
• Direct actuation:
  • DIRECT SELECT lever

Additional function requirements for ambiance illumination (with CODE 876 (Interior lights package)) 

• Circuit 15R ON
• Illumination intensity of ambiance illumination set
• Circuit 58d, sent from instrument cluster over the interior CAN

Function sequence for ambiance illumination (with CODE 876 (Interior lights package)) 

The ambiance illumination encompasses the illumination of the footwells, the center console as well as the trim pieces on the instrument panel and on the vehicle doors.

The intensity of the ambiance illumination can be adjusted in five stages using the "Settings" menu in the instrument cluster.

The illumination intensity of the ambiance illumination cannot be set in the instrument cluster as long as one of the vehicle doors is open.

In this case, the ambiance illumination can only be completely deactivated in the instrument cluster.

The following signals are read in and evaluated by the SAM control unit in order to control the ambiance illumination:

• Status of circuit 15, sent by the electronic ignition lock control unit via interior CAN
• Status of ambiance illumination brightness, sent by the instrument cluster over the interior CAN

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

• Rear control unit
• Left front door control unit
• Right front door control unit
• Left rear door control unit
• Right rear door control unit

The rear control unit actuates the following components:

• Driver-side instrument panel ambiance illumination
• Passenger-side instrument panel ambiance illumination

The left front door control unit actuates the left front door ambiance illumination.

The right front door control unit actuates the right front door ambiance illumination.

The left rear door control unit actuates the left rear door ambiance illumination.

The right rear door control unit actuates the right rear door ambiance illumination.

In addition, the following components of the footwell illumination are actuated in a dimmed state while driving:

• Left front footwell lamp from SAM control unit
• Right front footwell lamp from SAM control unit
• Left rear footwell lamp from driver seat control unit
• Right rear footwell lamp from front passenger seat control unit

When the vehicle is unlocked using the central locking system, the ambiance illumination components are actuated at a set brightness setting. The opening of a vehicle door triggers the actuation of the ambiance illumination at 100 % of the possible illumination intensity.

After closing the vehicle doors, the ambiance illumination components are actuated again at the previously set illumination intensity.

Upon locking the central locking, the function is deactivated following a run-on time of t = 3 s.

If no other ambiance illumination function is active, the ambiance illumination is controlled on the basis of the circuit 58d signal.

Search and symbol illumination electrical function schematic		PE82.20-P-2054-97NAA
Electrical function schematic ambiance illumination	MODEL 166 up to model year 2016 with CODE 876 (Interior lighting package)	PE82.20-P-2053-97NAA
Overview of interior illumination (IBL) system components		GF82.20-P-9997GR