Exterior light-dependent control of interior lighting, function - GF82.20-P-3003S

MODEL 220

All CAN signals refer to the passenger compartment CAN bus. The CAN arrows serve only for illustration of the data flow. In each case they refer to the same CAN bus!

Data flow chart

Fig 1: Exterior Light-Dependent Control Of Interior Lighting Function Diagram

Some of the internal and external lighting features can be controlled depending on the brightness of the outdoor light. For this purpose the "driving light circuit" must be switched to automatic on the instrument cluster (A1).

Three functions can be differentiated for the interior lighting:

Brightness depending light function for dome lamps
Brightness depending light function for search illumination (c.58d)
Light function for entry/exit lamps (always brightness dependent)

Prerequisites:

Door contact ON and OFF switch (N70s3) in ON position
(For search illumination and dome lamps only)
"Driving light circuit" set to automatic on instrument cluster (A1). The instrument cluster (A1) then generates the CAN signal "automatic driving light function on " (1).

Brightness dependent light function for dome lamps

The overhead control panel control module receives the CAN signal "automatic driving light function on " (1) and
the brightness signal (2) from the automatic light switch daylight sensor (B32/1).
if the overhead control panel control module interprets the brightness signal (3) as "night" , the dome lamps are switched on request, e.g. when a door is opened, by the overhead control panel control module.

Brightness dependent light function for search illumination

The overhead control panel control module receives the CAN signal "automatic driving light function on " (1) and
brightness signal (2) from the automatic light switch daylight sensor (B32/1).
If the overhead control panel control module interprets the brightness signal (3) as "night" , it switches the CAN signal "automatic driving light switch-on/switch-off" (3) to ON.
The left front SAM control module (N10/6) receives the signal and generates the CAN signal "switch on parking lights" (4) .
The instrument cluster (A1) receives the signal and activates the CAN signal c.58d.
The control modules to which the lights for search illumination are connected, receives the CAN signal c.58d and switches on the lights.

C.58d is a pulse width-modulated signal, whose on/off ratio can be set between 12 % and 100 % by means of the instrument and search illumination rheostat (A1r1) as soon as the CAN signal "switch on parking lights" (4) is active. If the automatic light switch daylight sensor (B32/1) is defective the search illumination acts as if "night" were recognized.

Light function for entry/exit lamps

The overhead control panel control module interprets the brightness signal (3) as "night" , then it switches on the CAN signal " switch-on/off exit lamps".
The door control modules (N69/1, N69/2, N69/3, N69/4) receive the signal and actuate the entry/exit lamps accordingly when a door is opened.

If a malfunction is present, the entry/exit lamps act as if night were recognized and switch on the CAN signal " switch on/off exit lamps". If the voltage is too high/too low, the CAN signal "switch on/off exit lamps" is never switched on.

Change in brightness or door contact ON and OFF switch (N70s3) during brightness dependent light function

If the brightness information for the position of the door contact ON and OFF switch (N70s3) changes, this change is taken into consideration.

	Search illumination, function		GF82.20-P-0003S
	Adjusting search illumination, function		GF54.30-P-2010S
	Switching on/off front dome lamp, function		GF82.20-P-2019S
	Switching on/off rear dome lamp, function		GF82.20-P-2020S
	Switching on/off entry/exit lamps, function		GF82.20-P-2022S
	Overhead control panel control module, location/purpose/design/function		GF82.20-P-4101S
	Exterior lighting, function		GF82.10-P-0003A