Automatic Interior Lights Control, Function - GF82.20-P-2200GN
MODEL 166
as of model year 2016
MODEL 292
Block diagram
Function requirements, general
- No overvoltage or undervoltage (operating voltage range U ≥ 8, 5 ≤ 17 V)
Automatic interior lights control in general
The automatic interior lights control implements the actuation of all components of the interior illumination (IBL), the warning and exit illumination and the load compartment illumination. The appropriate requests are generated automatically. The master control unit for the automatic interior lights control is the SAM 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 load compartment illumination
- 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 with airbag deployment
Additional function requirements for locator lighting
- Automatic interior lights switched on via interior lamp switch
- Locking the vehicle via the central locking (CL [ZV])
Locator lighting function sequence
For control of the locator lighting the SAM control unit reads in the following signals and evaluates these:
- Status of interior lamp switch
- Status of CL [ZV] and circuit 15 transmitted via the interior CAN by the electronic ignition lock control unit
The SAM control unit transmits the request "Switch on locator lighting" via the roof LIN to the overhead control panel control unit, which actuates the following interior illumination components:
- Rear lamp in the rear dome lamp (with CODE 876 (Interior lights package))
- Central load compartment dome lamp
- Left dome lamp, 2nd seat row
- Right dome lamp, 2nd seat row
- Left front interior lamp (dimmed)
- Right front interior lamp (dimmed)
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 via the COMAND controller unit, it automatically switches itself on when the vehicle is unlocked using CL [ZV]. This causes the "Standing lights actuation active" signal to be set, which also activates the search and symbol illumination. The search and symbol illumination function is described in a separate document.
The rear SAM control unit also actuates the following components in a dimmed state:
- Right front footwell lamp
- Left front footwell lamp
- Left rear footwell lamp (with CODE 876 (Interior lights package)) via the driver seat control unit
- Right rear footwell lamp (with CODE 876 (Interior lights package)) via the front passenger seat control unit
Additional function requirements for orientation lighting
- Automatic interior lights switched on via interior lamp switch
- Circuit 15 OFF
- Vehicle doors closed
Function sequence for orientation lighting
For control of the orientation lighting the SAM control unit reads in and evaluates the following signals:
- Status of interior lamp switch
- Status of circuit 15, transmitted by the electronic ignition lock control unit via the interior CAN
The SAM control unit activates the orientation lighting after switching off circuit 15C and actuates the following components (dimmed):
- Right front footwell lamp
- Left front footwell lamp
- Left rear footwell lamp (with CODE 876 (Interior lights package)) via the driver seat control unit
- Right rear footwell lamp (with CODE 876 (Interior lights package)) via the front passenger seat control unit
The SAM control unit transmits the request "Switch on orientation lighting" via the roof LIN to the overhead control panel control unit, which actuates the following interior illumination components:
- Rear dome lamp (with CODE 876 (Interior lights package))
- Central load compartment dome lamp
- Left dome lamp, 2nd seat row
- Right dome lamp, 2nd seat row
- Left front interior lamp
- Right front interior lamp
With the vehicle doors closed, all lamps that are on are switched off after approx. t = 20 s.
The OFF delay time (0 s, 15 s, 30 s, 45 s or 60 s) can be switched on and off using the "Settings" menu at the COMAND controller unit. The respective selection is sent by the COMAND controller unit via the interior CAN to the SAM control unit.
Additional function requirements for warning and exit illumination
- Interior lamp switch not in "Off" position
Function sequence for warning and exit illumination
When a vehicle door is opened, the front SAM control unit activates the warning and exit illumination.
The front door control units transmit the status of the front doors (open or closed) to the front SAM control unit via interior CAN.
The rear door control units transmit the status of the rear doors (open or closed) to the SAM control unit via interior CAN.
The SAM control unit sends the request to switch on the warning and exit illumination to the following control units via interior CAN:
- Left front door control unit
- Right front door control unit
- Left rear door control unit
- Right rear door control unit
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
The rear control unit then actuates the following components in accordance with the door status:
- Left front illuminated door sill molding
- Right front illuminated door sill molding
The overhead control panel control unit actuates the following interior illumination components in accordance with the status of the interior lamp switch:
- Rear dome lamp (with CODE 876 (Interior lights package))
- Central load compartment dome lamp
- Left dome lamp, 2nd seat row
- Right dome lamp, 2nd seat row
- Left front interior lamp
- Right front interior lamp
The SAM control unit also actuates the following components in an undimmed state:
- Right front footwell lamp
- Left front footwell lamp
- Left rear footwell lamp (with CODE 876 (Interior lights package)) via the driver seat control unit
- Right rear footwell lamp (with CODE 876 (Interior lights package)) via the front passenger seat control unit
When all vehicle doors have been closed again and the electronic ignition lock control unit transmits the status of circuit 15 ON via the interior CAN, the interior lights are switched off. The footwell lamps are then actuated in a dimmed state again.
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 load compartment illumination function requirements
- Vehicle stationary
- Liftgate open
- Interior lamp switch not in "Off" position
Function sequence for load compartment illumination
To control the load compartment illumination, the rear control unit directly reads in the status of the liftgate rotary tumbler switch in the liftgate central locking motor and sends this via interior CAN to the SAM control unit. The SAM control unit evaluates this and sends the "Switch on cargo area illumination" request over the roof LIN to the overhead control panel control unit and over the interior CAN to the rear control unit.
The rear control unit actuates the liftgate ambient lamp, and on vehicles with CODE 890 (EASY-PACK liftgate), the liftgate control button symbol illumination. The SAM control unit also actuates the cargo area lamp.
The overhead control panel control unit actuates the following interior illumination components:
- Rear dome lamp (with CODE 876 (Interior lights package))
- Central load compartment dome lamp
- Left dome lamp, 2nd seat row
- Right dome lamp, 2nd seat row
To preserve the on-board electrical system battery all lights that are on when the liftgate is open and at circuit 15 OFF are switched off after t = 5 minutes.
The SAM control unit receives the status of the front doors from the front door control units and the current status of circuit 15 from the electronic ignition lock control unit via the interior CAN, so that all switched-on lights can be activated again at the end of a journey with the liftgate open. After closing the liftgate all switched-on lights are switched off.
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 ATA [EDW] alarm has been triggered. The ATA/tow-away protection/interior protection control unit sends the status of the ATA over the interior CAN to the SAM control unit. The SAM control unit evaluates this and sends the "Switch on interior illumination" request over roof LIN to the overhead control panel control unit.
The overhead control panel control unit then actuates the following interior illumination components:
- Rear dome lamp (with CODE 876 (Interior lights package))
- Central load compartment dome lamp
- Left dome lamp, 2nd seat row
- Right dome lamp, 2nd seat row
- Left front interior lamp
- Right front interior lamp
The SAM control unit also actuates the following components in an undimmed state:
- Right front footwell lamp
- Left front footwell lamp
- Left rear footwell lamp (with CODE 876 (Interior lights package)) via the driver seat control unit
- Right rear footwell lamp (with CODE 876 (Interior lights package)) via the front passenger seat control unit
Additional function requirements for interior illumination following an accident with airbag deployment
- Airbag deployment by the supplemental restraint system control unit
- Crash detection by the crash sensor in the SAM control unit
- Vehicle stationary
Function sequence for interior illumination after accident with airbag deployment
The interior illumination is actuated in order to provide better orientation for the occupants and the first aiders following an accident. If the Supplemental Restraint System control unit recognizes an accident event, it sends corresponding information via chassis CAN 1, electronic ignition lock control unit and the interior CAN to the SAM control unit. The SAM control unit receives this, evaluates it, and sends this "Switch on interior illumination" request via the roof LIN to the overhead control panel control unit.
The overhead control panel control unit actuates the following interior illumination components with a delay of t = 11 s:
- Rear dome lamp (with CODE 876 (Interior lights package))
- Central load compartment dome lamp
- Left dome lamp, 2nd seat row
- Right dome lamp, 2nd seat row
- Left front interior lamp
- Right front interior lamp
The SAM control unit also actuates the following components in an undimmed state:
- Right front footwell lamp
- Left front footwell lamp
- Left rear footwell lamp (with CODE 876 (Interior lights package)) via the driver seat control unit
- Right rear footwell lamp (with CODE 876 (Interior lights package)) via the front passenger seat control unit
The interior illumination function is deactivated under the following conditions:
- Hazard warning flasher function is switched off
- Unlocking the CL [ZV]
- The status of circuit 15R changes to circuit 15 On
- Opening a vehicle door
| Automatic interior lights control electrical function schematic | PE82.20-P-2052-97NBA | ||
| Overview of interior illumination (IBL) system components | GF82.20-P-9997GN |