GF82.20-P-3004QA Automatic Dome Lamp Actuation, Function

GF82.20-P-3004QA Automatic Dome Lamp Actuation, Function

Component Identification:

Basic preconditions for the automatic functions
^ Automatic driving light actuation is switched on via the instrument cluster (A1).
^ the dome lamp switch (N70s3) is switched on.
^ The rain/light sensor (B38/2) has recognized "night".
^ Automatic driving light actuation is switched off via the instrument cluster (A1).

If the front dome lamp (N70e1) has been switched on manually, no automatic functions can be performed.

Automatic functions of front dome lamp (N70e1)
When a door is opened, the front dome lamp (N70e1) is switched on dimmed.

The front dome lamp (N70e1) is switched off under the following conditions:
^ With "circuit 15 ON" dimmed, immediately after the last door has been closed or automatically 30 minutes after opening the last door.
^ With "circuit 15 OFF" dimmed, 8 seconds after closing the last door. Or automatically after t = 5 min., when the last door has been closed.

Unlocking the vehicle switches the front dome lamp (N70e1) on (dimmed). Switching off takes place dimmed, 30 seconds after unlocking the vehicle. After removing the transmitter key (A8/1), the dome lamp (N70e1) is switched on (dimmed). Switching-off is effected automatically after the OFF delay time of the interior light adjusted in the instrument cluster (A1). The OFF delay time can be set to a value of between 0 and 20 sec. at 5-second intervals.

If position "circuit 15 ON" is activated while an automatic lighting function is active, the front dome lamp (N70e1) is immediately switched off (dimmed). If the prerequisites (position of left door contact switch (S17/3) or right door contact switch (S17/4) or rain/light sensor information) change during an automatic function, the change is carried out immediately.

In vehicles with code (551) Anti-theft alarm system (ATA) If an ATA alarm occurs, the front dome lamp (N70e1) is switched on immediately without dimming.

Front dome lamp (N70e1) actuation
Actuation takes place internally in the overhead control panel control unit (N70) in which the front dome lamp (N70e1) and the dome lamp switch (N70s3) are integrated.

The overhead control panel control unit (N70) contains the following information hereto:
^ Brightness
The rain/light sensor (B38/2) signal is read in by the overhead control panel control unit (N70) for this purpose.
^ The condition of the left door contact switch (S17/3) and the right door contact switch (S17/4)
They are read in by the rear SAM control unit with fuse and relay module (N10/2) and relayed via the class B (interior) Controller Area Network Bus (CAN-B).
^ The interior light OFF delay time setting
It is relayed by the instrument cluster (A1) to the overhead control panel control unit (N70) via the CAN-B.

If undervoltage or overvoltage occurs, the front dome lamp (N70e1) is switched off immediately without dimming. When the correct voltage is restored, the front dome lamp (N70e1) is switched on without dimming.

No switching off takes place in vehicles with code (551) Anti- theft alarm system (ATA).

Ambient lamp
As of 01.12.04 an ambient lamp (A67e3) is installed that is used for ambiance illumination. The ambient lamp (A67e3) is switched on and off by changes to the status of circuit 15R.