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



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

Automatic interior lights control in general
The automatic interior lights control implements the actuation of all components of the interior illumination as well as all warning and exit illumination components.
The corresponding requests are generated automatically. The master control unit for the automatic interior lights control is the overhead control panel control unit (N70).

The automatic interior lights control feature comprises the following subfunctions:
^ Locator lighting function sequence
^ Function sequence for warning and exit illumination
^ Function sequence for trunk 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
^ Door contact ON and OFF switch (N70s3) in the "Automatic interior lights" position
^ Rain/light sensor (B38/2) (with code (345) Rain sensor) registers darkness
^ Vehicle unlocking via the central locking system (CL [ZV]) or
^ Intentional exit from the vehicle by removing the transmitter key (A8/1) from the EIS [EZS] control unit (N73)

Locator lighting function sequence
When unlocking the central locking system (CL [ZV]) or when removing the transmitter key (A8/1) from the EIS [EZS] control unit (N73), the overhead control panel control unit actuates the following components in the interior illumination:
- Left interior lamp (N70e4)
- Right interior lamp (N70e5)

If the function is requested by unlocking the central locking, all the interior lights are switched off after t = 30 s or immediately, if the vehicle is locked again within t = 3 s of unlocking it.
If the function is requested through intentional leaving of the vehicle, the interior illumination is switched off corresponding to the OFF delay time set in the instrument cluster (A1). The duration of the OFF delay time can be set and is sent by the instrument cluster to the interior CAN.
For vehicles with code (876) Interior lights package, the overhead control panel control unit also sends the request to switch on the footwell illumination via the interior CAN to the driver SAM control unit with fuse and relay module (N10/1).

The driver SAM control unit actuates the following components in the footwell illumination (with code (876) Interior lights package) using the set brightness value for the symbol illumination:
- right front footwell lamp (E17/15)
- left front footwell lamp (E17/16)

Additional function requirements for warning and exit illumination
^ Opening a vehicle door

Function sequence for warning and exit illumination
To control the warning and exit illumination, the following information is read in and evaluated by the overhead control panel control unit:
- Status of left door contact switch (S17/3) and status of right door contact switch (S17/4) supplied by rear SAM control unit with fuse and relay module (N10/2) via the interior CAN

The overhead control panel control unit transmits the switch-on request for the warning and exit illumination as well as the footwell illumination via the interior CAN to the following control units:
- Driver-side SAM control unit
- Left door control unit (N69/1)
- Right door control unit (N69/2)

The following components of the warning and exit illumination are actuated corresponding to the door status:
- Left door entrance/exit lamp (E17/3) from left door control unit
- Right door entrance/exit lamp (E17/4) from right door control unit

The overhead control panel control unit actuates the following interior illumination components:
- Left interior lamp
- Right interior lamp

The driver SAM control unit actuates the footwell lamps with the brightness value, equivalent to 100 %.
If all vehicle doors are closed again and if the EIS [EZS] control unit supplies the circuit 15 ON terminal status to the interior CAN, the interior illumination is then switched off. The footwell lamps are then actuated again at the set brightness value for the symbol illumination.

At circuit 15 OFF and with the vehicle door open, all switched on lights are switched off after expiry of t = 5 min and once the last vehicle door has been closed after expiry of t = 8 s to preserve the battery (G1).

Additional function requirements for trunk illumination
^ Vehicle stationary
^ Trunk lid opened

Function sequence for trunk illumination
To actuate the load compartment illumination, the rear SAM control unit reads in the status of the trunk lid rotary tumbler microswitch (S88/1). The rear SAM control unit then actuates the left trunk lamp (E18/5) corresponding to this status.

When the trunk lid is open, the power supply for the trunk lamp is interrupted after t = 30 min to preserve the battery.

Additional function requirements for interior illumination with ATA [EDW] alarm
^ ATA [EDW] alarm activated

Function sequence for interior illumination with ATA [EDW] alarm
The rear SAM control unit transmits the "ATA [EDW] alarm triggered" signal via interior CAN to the overhead control panel control unit.

The overhead control panel control unit transmits the request to switch on the footwell illumination over the interior CAN to the driver SAM control unit and actuates the following interior illumination components:
- Left reading lamp (A67e1) and right reading lamp (A67e2) (with code (876) Interior lights package)
- Left interior lights and right interior lights

The driver SAM control unit actuates the footwell lamps.

Additional function requirements for interior illumination following an accident with airbag deployment
^ Airbag deployment through the restraint system control unit (N2/7)
^ 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.
The "Crash event" data is stored by the restraint system control unit on the interior CAN. The overhead control panel control unit receives this data, transmits the request to switch on the footwell illumination over the interior CAN to the driver SAM control unit and actuates the following interior illumination components:
- Left interior lamp
- Right interior lamp

The driver SAM control unit actuates the footwell lamps.

The interior illumination function following an accident with airbag deployment is deactivated under the following conditions:
- Hazard warning system switch (N72/1s5) actuated
- Unlocking the central locking system
- Change in circuit status from circuit 15R to circuit 15 On
- Opening a vehicle door