GF82.20-P-2200CA Automatic Interior Lights Control, Function

GF82.20-P-2200CA Automatic Interior Lights Control, Function

Function requirements for automatic interior lights control, general
^ No overvoltage or undervoltage
(operating voltage range U ≥7 ≤17.5 V)

Automatic interior lights control in general
The automatic interior lights control implements the actuation of all components of the interior illumination as well as the warning and exit illumination and the cargo area illumination.
The corresponding requests are generated automatically. The master control unit for the automatic interior lights control is the front SAM control unit with fuse and relay module (N10/1).

The automatic interior lights control feature consists of the following subfunctions:
^ Locator lighting function sequence
^ 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 following an accident with airbag deployment

Additional function requirements for locator lighting
^ Automatic interior lights switched on via interior lamp automatic function switch (N70/3s3)
^ Vehicle unlocking via the central locking system (CL [ZV]) or
^ Intentional exit of the vehicle by pulling the transmitter key (A8/1) out of the electronic ignition lock control unit (N73)

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
- Status of central locking and status of circuit 15 provided on the interior CAN (CAN B) by the electronic ignition lock control unit

The overhead control panel electronics (N70/3) are supplied with power via the front SAM control unit.

The front SAM control unit thus indirectly actuates the following components of the interior illumination:
- Left front interior lamp (N70/3e4)
- Right front interior lamp (N70/3e5)
- Rear interior lamp (E15/3e3) (model 207.3)

When unlocking the central locking, all lamps are switched off after t = 40 s or immediately if the vehicle is locked again within t = 3 s of the unlocking.
If intentionally exiting the vehicle, all lamps are switched off after t = 15 s.
The OFF delay time can be switched on or off via the "set up" menu in the instrument cluster (A1). The instrument cluster sends the corresponding selection via interior CAN to the front SAM control unit.

If the "ambient illumination" function is activated via the "set up", "light" menu in the instrument cluster, this automatically switches itself on when the vehicle is unlocked by means of transmitter key.

This causes the "Standing lights actuation active" signal to be set, which also activates the search and symbol illumination. The switch and controls and symbol illumination function is described in a separate document.

The front SAM control unit also actuates the following components in accordance with a defined brightness value:
- Right front footwell lamp (E17/15)
- Left front footwell lamp (E17/16)

The dimming value of the footwell lamps is determined via the software calibration number (SCN) coding.

Function sequence for warning and exit illumination
The warning and exit illumination is activated by opening a vehicle door.

The following signals are read in and evaluated by the front SAM control unit for controlling the warning and exit illumination:
- Status of left front door rotary tumbler switch (A85s1) provided on the interior CAN by the left front door control unit (N69/1)
- Status of right front door rotary tumbler switch (A85/1s1) provided on the interior CAN by the right front door control unit (N69/2)

The front SAM control unit transmits the request to switch on the warning and exit illumination as well as the interior illumination via the interior CAN to the following control units:
- Left front door control unit
- Right front door control unit

The following components of the warning and exit illumination are actuated directly according to the door status:
- By the left front door control unit:
- Left front door exit and warning lamp (E17/3)
- Left front door warning lamp (E17/19)
- By the right front door control unit:
- Right front door exit and warning lamp (E17/4)
- Right front door warning lamp (E17/21)

The following components of the interior illumination are actuated indirectly by means of the power supply for the overhead control panel electronics via the front SAM control unit in accordance with the status of the interior lamp automatic function switch:
- Left front interior lights
- Right front interior lights
- Rear interior lamp

In addition, the footwell lamps are actuated by the front SAM control unit with the brightness value that corresponds to 100 %.

If all vehicle doors are closed again and the status of circuit 15 ON was provided on the interior CAN by the electronic ignition lock control unit, the interior lights are switched off.
The footwell lamps are then actuated again with the defined brightness value.

To preserve the on-board electrical system battery (G1), all lights that are switched on with the vehicle door open are switched off after t = 5 min and after closing the last vehicle door after t = 8 s with circuit 15 OFF.

Additional load compartment illumination function requirements
^ Vehicle stationary
^ Trunk lid open

Function sequence for load compartment illumination
To control the cargo area illumination, the front SAM control unit reads in the following signal:
- Status of trunk lid rotary tumbler switch (M14/7s1) provided on the interior CAN by the rear SAM control unit with fuse and relay module (N10/2)

The front SAM control unit transmits the request to switch on the load compartment illumination via the interior CAN to the rear SAM control unit, which then actuates the following load compartment illumination components:
- Right luggage compartment lamp (E18/4)
- Trunk lid ambient lamp (E40)

To preserve the on-board electrical system battery, the trunk lid ambient lamp and the right trunk lamp are switched off with the trunk lid open after t = 10 min.

The status of the vehicle doors is provided to the rear SAM control unit by the front door control units and the current status of circuit 15 by the electronic ignition lock control unit on the interior CAN so that the cargo area illumination can be reactivated after driving with the trunk lid open.
After closing the trunk lid, the trunk lid ambient lamp and the right trunk lamp are switched off.

Additional function requirements for interior illumination with ATA [EDW] alarm (with code (551) Antitheft 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 transmits the "ATA [EDW] alarm triggered" signal via interior CAN to the front SAM control unit. The following components of the interior illumination are actuated indirectly by the front SAM control unit through the power supply for the overhead control panel electronics:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp

The front SAM control unit also actuates the footwell lamps.

Additional function requirements for interior illumination following an accident with airbag deployment
^ Airbag deployment by the supplemental restraint system control unit (N2/10) or
^ Crash recognition by the crash sensor in the front SAM control unit
^ Vehicle stationary

Function sequence for interior illumination following an accident with airbag deployment
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 recognizes a crash event, it sends the corresponding information via chassis CAN (CAN E) to the front SAM control unit. The front SAM control unit receives this and evaluates it.

The following components of the interior illumination are actuated indirectly by the front SAM control unit through the power supply for the overhead control panel electronics:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp

The front SAM control unit also actuates the footwell lamps.

The interior illumination function following an accident with airbag deployment is deactivated under the following conditions:
- Hazard warning flasher switch (S6/1s1) operated
- Unlocking the CL [ZV]
- Status of circuit 15R changes to circuit 15 On
- Opening a vehicle door