The following description refers to left-hand drive vehicles.The specifications are analog for right-hand drive vehicles.
The left front door control unit (N69/1) has the following purpose:
Scanning the following switches:
Driver power window switch group (S20/1)
Left front door ESA [ESV] switch group (with memory) (S91/2) (on left-hand drive vehicles with code (275) Electrically adjustable driver seat, steering column and outside mirrors with memory)
Reading the following sensors:
Left front IR receiver (A26/1)
Hall sensor signals for left front power window motor (M10/3)
Hall sensor signals for left electrically adjustable and heated outside mirror (M21/1)
Switching loads via semiconductor switches:
Left front power window motor (M10/3)
Left front door CL [ZV] motor (M14/6)
Mirror up/down adjustment motor (M21/1m1)
Mirror in/out adjustment motor (M21/1m2)
Mirror fold-in motor (M21/1m3)
(with code (500) Folding left/right outside mirrors)
Mirror heater (M21/1r1)
Automatic dimming mirror (M21/1h1) (for code (249) Automatically dimming inside rearview mirror and outside mirror (driver))
Left outside mirror turn signal lamp (E6/5)
Left front door entrance/exit lamp (E17/3)
(only model 203.0/2)
Switch and controls illumination for all switches connected
The left front door control unit (N69/1) is connected with the Controller Area Network bus, class B (interior compartment) (CAN B) to exchange data.