Switching on/off front dome lamp, function - GF82.20-P-2019S

MODEL 220

Fig 1: Switching On/Off Front Dome Lamp Function Diagram

Manually switching on and off front dome lamp:

The front dome lamp (N17e1) is faded on when the interior lamp ON and OFF switch (N70s4) in the overhead control panel control module (N70) is actuated.

The front dome lamp is faded off by turning the switch to the original position or automatically after 30 minutes when no signals are presents on the bus to protect the battery.

If the lamp is switched on manually , none of the automatic features described below are performed.

Prerequisites for automatic features

automatic driving light circuit switched on instrument cluster (A1) and
door contact ON and OFF switch (N70s3) switched on (switch in center position) and
light sensor has recognized night

or :

automatic driving light circuit switched off on instrument cluster (A1) and
door contact ON and OFF switch (N70s3) switched on (switch in center position)

Automatic features for front dome lamp

When one of the front doors is opened the front door lamp (N17e1) is faded on.
Switch-off is accomplished:
- with c.15 ON: lamp is faded off immediately after the last front door is closed or automatically 30 minutes after the last front door is opened.
- with c.15 OFF: front dome lamp is faded off 8 s after the last front door is closed or automatically 5 minutes after the last front door is opened.
The front door lamp is faded on when the vehicle is unlocked. Switch-off is accomplished:
- Fade off 30 s after unlocking
The front dome lamp (N17e1) is faded on when the ignition key is removed .
Switch-off is accomplished automatically according to the interior light shut-off delay time set on the instrument cluster (A1) (possible settings are 0 s, 5 s, 10 s, 15 s, and 20 s.)
- If c.15 is switched on while the automatic light feature is active; the dome lamp is faded off immediately.

If the prerequisites (door contact ON/OFF switch position or light sensor information) change during performance of an automatic feature, the change is read in.
Example:

If the dome lamp is switched on because one of the front doors is open and the light sensor information changes from "night" to "day", the dome lamp is faded off immediately. (Prerequisites: automatic driving light circuit switched on!)

ATA and taxi emergency alarm

The lamp is switched on immediately without the fade on function in the event of an ATA or taxi-emergency alarm.

Actuation

The actuation of the lamp is accomplished internally in the overhead control panel control module (N70) in which the lamp and rocker switch is integrated.

For this purpose the overhead control panel control module receives the following information:

Brightness; for this purpose the automatic light switch daylight sensor (B32/1) is read in directly by the overhead control panel control module (N70),
the status of the front door contact switch (S17/3 and S17/4); are read in by the rear SAM control module (N10/8) and relayed on via the CAN bus (passenger compartment)
the set interior light shut-off delay; this is relayed to the overhead control panel control module by the instrument cluster (A1) via the CAN bus (passenger compartment).

Voltage too high/too low

If the voltage is too low the lamp is switched off immediately without fade-out . When the correct voltage returns the lamp is switched back on without fade-on .

In the event of an ATA or taxi emergency alarm the light is not switched off when the voltage is too high/too low.

	Interior lighting (IL), location of components		GF82.20-P-0002-01S
	Switching on/off rear dome lamp, function		GF82.20-P-2020S
	Exterior-light-dependent control of interior lighting, function		GF82.20-P-3003S
	Dimming interior lighting, function		GF82.20-P-3002S
	Switching on interior lighting with anti-theft alarm (ATA), function		GF82.20-P-2007S
	Anti-theft alarm (ATA), function		GF80.50-P-0001S
	Central locking (CL), function		GF80.20-P-0005S
	Rear dome lamp, location/purpose/design/function		GF82.20-P-4109S
	Overhead control panel control module, location/purpose/design/function		GF82.20-P-4101S
	Rear signal-acquisition and actuation module (SAM), location/purpose/design/function		GF54.21-P-4103S
	Door contacts, location/purpose/design/function		GF82.20-P-4102S