Automatic interior lights control, function - GF82.20-P-2200FQ
MODEL 218
Function requirements, general
- No overvoltage or undervoltage (operating voltage range U ≥8 ≤17.5 V)
Automatic interior lights control in general
The automatic interior lights control implements the actuation of all components of the interior illumination (IBL) as well as the warning and exit illumination.
The appropriate requests are generated automatically. The master control unit for the automatic interior lights control is the front SAM control unit.
A distinction is made between the following variants:
- Actuation via non-networked overhead control panel electronics (on vehicles without code (414) Power glass tilting/sliding roof)
- Actuation via networked overhead control panel control unit (on vehicles with code (414) Power glass tilting/sliding roof)
The overhead control panel electronics are supplied with voltage by the front SAM control unit.
The overhead control panel control unit is a participant on the interior CAN. The front SAM control unit sends the corresponding requests via interior CAN to the overhead control panel control unit.
The automatic interior lights control function encompasses the following subfunctions:
- Locator lighting function sequence
- Function sequence for orientation lighting
- Function sequence for warning and exit illumination
- Function sequence for trunk illumination (model 218.3) or load compartment illumination (model 218.9)
- Function sequence for interior illumination with anti-theft alarm system (ATA [EDW]) alarm (with code (551) Anti-theft alarm system (ATA [EDW]))
- Function sequence for interior illumination after accident
Additional function requirements for locator lighting
- Automatic interior lights switched on via interior lamp automatic function switch
- Rain/light sensor signals "Darkness detected"
- Locking the vehicle via the central locking (CL [ZV])
Locator lighting function sequence
The following signals are read in and evaluated by the front SAM control unit for controlling the locator lighting feature:
- Status of interior lamp automatic function switch, directly from overhead control panel electronics on vehicles without code (414) Power glass tilting/sliding roof, via interior CAN from overhead control panel control unit on vehicles with code (414) Power glass tilting/sliding roof
- Data of rain/light sensor via wiper/inside rearview mirror LIN
- Status of central locking, sent by the electronic ignition lock control unit over the interior CAN
Vehicles without code (414) Power glass tilting/sliding roof
The overhead control panel electronics are supplied with voltage by the front SAM control unit. The front SAM control unit therefore indirectly actuates the following interior illumination components:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp
Vehicles with code (414) Power glass tilting/sliding roof
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:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp
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.
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 front SAM control unit actuates the following components in accordance with a defined brightness value:
- Left front footwell lamp
- Right front footwell lamp
- Left rear footwell lamp
- Right rear footwell lamp
Additional function requirements for orientation lighting
- Automatic interior lights switched on via interior lamp automatic function switch
- Circuit 15C OFF
Function sequence for orientation lighting
For control of the orientation lighting, the front SAM control unit reads in and evaluates the following signals:
- Status of interior lamp automatic function switch, directly from overhead control panel electronics on vehicles without code (414) Power glass tilting/sliding roof, via interior CAN from overhead control panel control unit on vehicles with code (414) Power glass tilting/sliding roof
- Status of circuit 15, sent by the electronic ignition lock control unit over the interior CAN
After switching off circuit 15C, the front SAM control unit sends the request to switch on the orientation lighting via interior CAN to the overhead control panel control unit (on vehicles with code (414) Power glass tilting/sliding roof) or directly to the overhead control panel electronics (on vehicles without code (414) Power glass tilting/sliding roof).
Vehicles without code (414) Power glass tilting/sliding roof
The overhead control panel electronics are supplied with voltage by the front SAM control unit. The front SAM control unit therefore indirectly actuates the following interior illumination components:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp
Vehicles with code (414) Power glass tilting/sliding roof
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:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp
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 front SAM control unit actuates the following components in accordance with a defined brightness value:
- Left front footwell lamp
- Right front footwell lamp
- Left rear footwell lamp
- Right rear footwell lamp
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:
- Status of left front door rotary tumbler switch in left front door door lock by the left front door control unit via interior CAN
- Status of right front door rotary tumbler switch in right front door door lock by the right front door control unit via interior CAN
- Status of left rear door rotary tumbler switch in the left rear door door lock and status of the right rear door rotary tumbler switch in the right rear door door lock by the rear SAM control unit via interior CAN
The front SAM control unit sends the request to switch on the warning, exit and interior illumination via interior CAN to the following control units:
- Left front door control unit
- Right front door control unit
- Left rear door control unit
- Right rear door control unit
- Overhead control panel control unit (with code (414) Power glass tilting/sliding sunroof)
The following components of the warning and exit illumination are actuated directly according to the door status:
- Left front door exit and warning lamp by the left front door control unit
- Right front door exit and warning lamp by the right front door control unit
- Left rear door exit and warning lamp by the left rear door control unit
- Right rear door exit and warning lamp by the right rear door control unit
Model 218.374/974:
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 2 (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:
- Voltage converter for left front illuminated door sill moldings and therefore the left front illuminated door sill molding
- Voltage converter for right front illuminated door sill moldings and therefore the right front illuminated door sill molding
The front illuminated door sill molding voltage converters supply the front illuminated door sill moldings with voltage. The luminescent films of the front illuminated door sill moldings work with an operating voltage of U = 130 V. The power supply of the front illuminated door sill moldings is interrupted after max. t = 5 min. 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.
In accordance with the status of the interior lamp automatic function switch, the following interior illumination components are actuated. Vehicles without code (414) Power glass tilting/sliding roof The overhead control panel electronics are supplied with voltage by the front SAM control unit. The front SAM control unit therefore indirectly actuates the following interior illumination components:
- Front interior lights
- Rear interior lamp
Vehicles with code (414) Power glass tilting/sliding roof
The overhead control panel control unit actuates the following interior illumination components:
- Front interior lights
- Rear interior lamp
All 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.
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 function requirements for trunk illumination (model 218.3) or load compartment illumination (model 218.9)
- Vehicle stationary
- Trunk lid or liftgate open
- Rain/light sensor reports "Darkness detected" (only control of the trunk lid or liftgate ambient illumination)
Function sequence for trunk illumination (model 218.3) or load compartment illumination (model 218.9)
The following signals are read in and evaluated by the front SAM control unit in order to control the load compartment illumination:
- Data of rain/light sensor via wiper/inside rearview mirror LIN
- Status of trunk lid/liftgate rotary tumbler switch
The front SAM control unit sends the request to switch on the trunk illumination or the load compartment illumination via interior CAN to the rear SAM control unit, which then actuates the following components:
- Right trunk lamp (dimmed)
- Left trunk lamp (dimmed)
- Trunk lid/liftgate ambient lamp
To preserve the on-board electrical system battery, the trunk lamps are switched off after t = 10 min if the trunk lid is open.
The status of the front doors is provided 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 open or the liftgate is open, the trunk illumination or 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]))
- ATA [EDW] alarm activated
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 sends the "ATA [EDW] alarm activated" signal to the front SAM control unit and the overhead control panel control unit via interior CAN.
Vehicles without code (414) Power glass tilting/sliding roof The overhead control panel electronics are supplied with voltage by the front SAM control unit. The front SAM control unit therefore indirectly actuates the following interior illumination components:
- Front interior lights
- Rear interior lamp
Vehicles with code (414) Power glass tilting/sliding roof
The overhead control panel control unit receives this signal and then actuates the following interior illumination components:
- Front interior lights
- Rear interior lamp
Furthermore, the front SAM control unit actuates all footwell lamps.
Additional function requirements of the interior illumination after an accident
- Airbag deployment by the supplemental restraint system control unit
- Crash detection by the crash sensor in the front SAM control unit
- Vehicle speed v = 0 km/h
Function sequence for interior illumination after accident
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, it sends the corresponding information 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 over the interior CAN.
The front SAM control unit receives this, evaluates it and generates the request to switch on the interior illumination.
Vehicles without code (414) Power glass tilting/sliding roof
The overhead control panel electronics are supplied with voltage by the front SAM control unit. The front SAM control unit therefore indirectly actuates the following interior illumination components:
- Front interior lights
- Rear interior lamp
Vehicles with code (414) Power glass tilting/sliding roof
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 interior illumination components:
- Front interior lights
- Rear interior lamp
Furthermore, the front SAM control unit actuates all footwell lamps.
After an accident, the interior illumination function is deactivated under the following conditions:
- Hazard warning flasher switch in upper control panel control unit pressed. The status of the hazard warning flasher switch is read in by the front SAM control unit via instrument panel LIN
- Unlocking the CL [ZV]
- Status of circuit 15R changes to circuit 15 On
- Opening a vehicle door
| Automatic interior lights control electrical function schematic | PE82.20-P-2052-97XAA |
| Overview of interior illumination (IBL) system components | GF82.20-P-9997FQ |