The overhead control panel (OCP) control unit (N70) has the following tasks:
Gateway for following components to Controller Area Network bus Class B (interior) (CAN B)
Automatic light switch daylight sensor (B32/1) up to 31.5.03
In-car temperature sensor (N70b1) up to 31.5.02 and as from 1.6.05
Telephone transmitter/receiver and TELE AID, D2B (A35/17) (for code (855) TELE AID)
Rain sensor (B38) up to 31.5.03 (for code (345) Rain sensor)
Rain/light sensor (B38/2) as from 1.6.03 (for code (345) Rain sensor)
Inside rearview mirror unit (A67) (for code (249) Automatically dimming inside rearview mirror and outside mirror (driver))
Garage door opener transmitter unit (A67n2) (for code (231) Garage door opener (in diagnostic mode only))
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Left interior motion sensor transmitter and receiver (A26/4) (for model 203.7 and code (882) Interior monitoring (with ATA [EDW] only))
Interior motion sensor transmitter and receiver (A26/14) (for models 203.0/2 and code (882) Interior monitoring (with ATA [EDW] only))
Voltage supply for following components
In-car temperature sensor fan motor (N70m1) up to 31.5.02 and as from 1.6.05
Rear dome lamp (E15/3) (for models 203.0/2 without code (220) Parktronic system (PTS))
PTS warning display, rear dome lamp (A44/3) (for models 203.0/2 and code (220) Parktronic system (PTS))
Inside rearview mirror unit (A67) (for code (249) Automatically dimming inside rearview mirror and outside mirror (driver))
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Garage door opener transmitter unit (A67n2) (for code (231) Garage door opener)
Telephone transmitter/receiver and TELE AID, D2B (A35/17) (for code (855) TELE AID)
Left vanity mirror illumination (E14/1) and right vanity mirror illumination (E14/2) (for code (543) Sun visors with illuminated mirror)
Left interior motion sensor transmitter and receiver (A26/4) (for model 203.7 and code (882) Interior monitoring (with ATA [EDW] only))
Interior motion sensor transmitter and receiver (A26/14) (for models 203.0/2 and code (882) Interior monitoring (with ATA [EDW] only))
Roof system drive unit (M12) and roller sun blind drive unit (M12/5) (for model 203.7 and code (413) Panoramic sliding roof)
Roof system drive unit (M12) (for models 203.0/2 and code (414) Power glass tilting/sliding roof)
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Actuation of interior lights (IBL) and following components
Surround lamp (A67e3)
front dome lamp (N70e1)
left front reading lamp (N70e2)
right front reading lamp (N70e3)
Rear dome lamp (E15/3) (for model 203.7)
Left reading lamp (E15/3e1), right reading lamp (E15/3e2) and dome lamp (E15/3e3) (for models 203.0/2 without code (220) Parktronic system (PTS))
Reading lamp 1 (A44/3e1), reading lamp 2 (A44/3e2) and dome lamp (A44/3e3) (for models 203.0/2 and code (220) Parktronic system (PTS))
Automatic dimming mirror (A67h3) (for code (249) Automatically dimming inside rearview mirror and outside mirror (driver))
Roof system drive unit (M12) and roller sun blind drive unit (M12/5) (for model 203.7 and code (413) Panoramic sliding roof)
Roof system drive unit (M12) (for models 203.0/2 and code (414) Power glass tilting/sliding roof)
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Reading in of integrated switches:
rear dome lamp switch (N70s2)
Dome lamp switch (N70s3)
Left front reading lamp switch (N70s6)
Right front reading lamp switch (N70s7)
Roof switch (N70s1) (for model 203.7 and code (413) Panoramic sliding roof or for code 203.0/2 and code (414) Power glass tilting/sliding roof)
For vehicles the overhead control panel control unit (N70) has an SOS pushbutton switch (S93/3) installed in it. Actuation is however carried out by the emergency call system control unit (N123/4).
Reading and evaluating sensors
Automatic light switch daylight sensor (B32/1) up to 31.5.03
In-car temperature sensor (N70b1) up to 31.5.02 and as from 1.6.05
Rain sensor (B38) up to 31.5.03 (for code (345) Rain sensor)
Rain/light sensor (B38/2) as from 1.6.03 (for code (345) Rain sensor)
Automatic dimming interior rearview mirror sensor, forward (A67h1) and automatic dimming interior rearview mirror sensor, back (A67h2) (for code (249) Automatically dimming inside rearview mirror and outside mirror (driver))
Hall sensor 1 (M12b1), Hall sensor 2 (M12b2), Roller sun blind Hall sensor 1 (M12/5b1) and Roller sun blind Hall sensor 2 (M12/5b2) (for model 203.7 and code (413) Panoramic sliding roof)
Hall sensor 1 (M12b1) and Hall sensor 2 (M12b2) (for models 203.0/2 and code (414) Power glass tilting/sliding roof)