Join Date: Apr 2006
Location: Pretoria, South Africa
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roller blind workings
I have finally solved my roller blind problem, which was an electronic fault and now understand it's workings.
Firstly, 12 volts must be present at fuse no.45 when the key is turned to it's first position.
The electronics for the roller blind is located within the roller blind "touch" switch housing. The switch needs to be removed from the centre console to gain access to the "extremly compact" pc board. This circuit recieves it's 12 volt supply from fuse no.45 and can be measured on one of the pins of the plug connecting to the pc board.
This pc board is directly connected to the roller blind motor (via a yellow and a white cable, via a loom on the driver's side floor on my e39 528i rhd) and supplies the voltage to raise/lower the blind by changing the polarity in the cables. When the blind has reached either end, extra current is drawn by the motor. The "current sensitive" circuit then stops the motor.
The fault on my car was that the voltage at fuse no.45 was too low. This fuse is one of a few that are supplied with voltage when the key is turned to the first position. I suspect that the fuses are powered by a module some where. I chose to build my own module which i connected up & fitted within the fuse recess.
It' been a few weeks since installation and so far so good.
Hope this helps.